CN112485833A - Urban tunnel abnormal body detection method based on loop line source ground hole transient electromagnetism - Google Patents
Urban tunnel abnormal body detection method based on loop line source ground hole transient electromagnetism Download PDFInfo
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Abstract
The invention discloses an urban tunnel abnormal body detection method based on small loop source hole transient electromagnetism, which is characterized in that an initial transmitting coil Tx is arranged by taking a selected exploration drilling hole as a center0To the initial transmitting coil Tx0The method comprises the steps of placing a 3-component probe in a selected exploration drilling hole through step current, receiving electromagnetic response information of an induced transient electromagnetic field point by point at fixed intervals, drawing a plurality of initial multi-channel profile graphs, judging that an abnormal body does not exist due to the fact that the amplitude of signals of all measuring points in each initial multi-channel profile graph is uniform, judging that the abnormal body exists due to the fact that the amplitude of the signals of a certain measuring point relative to the amplitudes of signals of upper and lower measuring points exceeds a second set range, determining that the abnormal body exists, determining the depth of the measuring point as the burial depth of the center of the abnormal body, detecting the abnormal body and the burial depth of the abnormal body, and enabling the result obtained by detection to be high in.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a method for detecting an abnormal body of an urban tunnel based on transient electromagnetism of a small loop source ground hole.
Background
At present, subway traffic is built in large scale in various regions to solve the problem of urban traffic jam. In the excavation process of the subway tunnel, advanced prediction work of bad geologic bodies such as abnormal bodies and the like must be done, and disastrous accidents such as water inrush and mud burst are prevented. Because the transient electromagnetic method has the characteristic of sensitivity to low-resistance bodies, engineering technical experts introduce the transient electromagnetic method into a tunnel for advanced detection of water-containing bodies in front of a tunnel face. For the tunnel space with a smaller section, an annular sector scanning technology is mostly adopted, namely a plurality of detection directions are arranged at different angles on a tunneling working face; for tunnel space with a large section, a multipoint array detection method is mostly adopted, namely, a transmitting return line is arranged on the tunnel face, and measuring points are arranged in the transmitting return line in an array mode; recently, a tunnel-hole transient electromagnetic advanced detection technology has been developed, in which a transmitting return line is arranged on a tunnel face, and a measuring point is arranged in an advanced horizontal probing hole of the tunnel face for receiving, so as to implement corresponding detection. The traditional detection methods are all carried out in the space of an underground roadway, are easily influenced by metal interference bodies, have limited detection distance and cannot completely meet engineering requirements due to resolution.
Disclosure of Invention
Aiming at the problems, the invention provides a method for detecting an abnormal body of an urban tunnel based on transient electromagnetism of a small loop source ground hole.
In order to realize the purpose of the invention, the urban tunnel abnormal body detection method based on the transient electromagnetism of the small loop source ground hole is provided, and comprises the following steps:
s10, selecting the exploration drill holes in a first set range in front of the tunnel face as selected exploration drill holes on the ground along the central axis of the tunnel according to the stop position of the tunnel face, and determining the description information of the selected exploration drill holes; the description information comprises coordinates, hole depths and horizontal distances from the tunnel face of corresponding exploration drilling holes;
s30, setting the initial transmitting coil Tx with the selected exploration borehole as the center0To the initial transmitting coil Tx0Passing a step current to generate a transient electromagnetic field in the subsurface;
s40, sequentially placing the 3-component probes into a plurality of drill holes related to the selected exploration drill holes, and receiving electromagnetic response information of the induced transient electromagnetic field point by point at fixed intervals; the electromagnetic response information comprises a signal response of an induced electromotive force or an induced magnetic field decaying with time;
s50, controlling the initial transmitting coil Tx0The method comprises the steps of emitting electromagnetic waves, receiving signals point by point from shallow to deep in a selected exploration drilling hole, drawing multi-channel profile curves of a plurality of time points by taking the position of a measuring point of the selected exploration drilling hole as a horizontal coordinate and the signal response amplitude as a vertical coordinate, obtaining each initial multi-channel profile curve, judging that an abnormal body does not exist if the amplitude of a signal of each measuring point is uniformly changed in each initial multi-channel profile curve, judging that the abnormal body exists if the amplitude of the signal of a certain measuring point relative to the signals of upper and lower measuring points exceeds a second set range, and determining the depth of the measuring point as the burial depth of the center of the abnormal body.
In one embodiment, the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further includes:
s60, arranging the first middle coils Tx in sequence on the circumference of the target exploration drilling hole as the center of circle1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Sequentially controlling the first intermediate coil Tx1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Determining signals received in the target exploration drilling holes when the electromagnetic waves are transmitted by the intermediate coils according to the step S40; the target survey borehole is a selected survey borehole in which an anomalous body exists;
and S70, respectively determining a multi-channel profile curve chart corresponding to signals received by the target exploration drill holes when each intermediate coil transmits electromagnetic waves, obtaining each intermediate multi-channel profile curve chart, and determining the direction information of the abnormal body relative to the tunnel according to each intermediate multi-channel profile curve chart.
Specifically, determining the orientation information of the anomaly relative to the tunnel according to each intermediate multi-trace profile graph comprises the following steps:
determining the amplitude of the signal generated by each intermediate coil at the point in the borehole of the target survey from each intermediate multi-trace profile, if the signal is generated by the first intermediate coil Tx1If the amplitude of the generated signal is maximum, the abnormal body is judged to be positioned in the tunnel, and a first middle coil Tx is arranged1If the amplitude of the signal generated by the second intermediate coil Tx2 is the maximum, the abnormality is located in the direction in which the second intermediate coil Tx2 is disposed, if it is generated by the third intermediate coil Tx3If the amplitude of the generated signal is maximum, the third middle coil Tx is abnormally arranged in the tunnel3If from the fourth intermediate coil Tx4If the amplitude of the generated signal is maximum, the fourth middle coil Tx is abnormally arranged in the tunnel4In the direction of (a).
In one embodiment, the second intermediate coil Tx2The tunnel face is arranged in the tunnel;
the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further comprises the following steps:
detecting whether the abnormal body is positioned between the target exploration drilling hole and the tunnel face according to the orientation information of the abnormal body relative to the tunnel, and if the abnormal body is positioned between the target exploration drilling hole and the tunnel face, performing second intermediate coil Tx2The right side of the return line is continuously provided with n ultimate transmitting coils at fixed intervals towards the palm surface, the ultimate transmitting coils are arranged right above the palm surface, and each n ultimate transmitting coils are arrangedWhen the polar transmitting coils transmit electromagnetic waves, signals are received in a target exploration drilling hole, and the horizontal distance from an abnormal body to a tunnel face is determined through the multi-channel profile curves corresponding to the n polar transmitting coils respectively.
According to the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism, according to the stop position of the tunnel face, the exploration drill holes in the first set range in front of the tunnel face are selected from the ground along the central axis of the tunnel to serve as the selected exploration drill holes, the description information of the selected exploration drill holes is determined, and the initial transmitting coil Tx is arranged by taking the selected exploration drill holes as the center0To the initial transmitting coil Tx0Energizing a step current to generate a transient electromagnetic field in the subsurface, sequentially placing a 3-component probe into a plurality of boreholes associated with a selected survey borehole, receiving electromagnetic response information inducing the transient electromagnetic field point by point at fixed intervals, and controlling the initial transmitting coil Tx0The method comprises the steps of emitting electromagnetic waves, receiving signals point by point from shallow to deep in a selected exploration drilling hole, drawing multi-channel profile curves of a plurality of time points by taking the position of a measuring point of the selected exploration drilling hole as a horizontal coordinate and a signal response amplitude as a vertical coordinate, obtaining each initial multi-channel profile curve, judging that an abnormal body does not exist if the amplitude of a signal of each measuring point is uniformly changed in each initial multi-channel profile curve, judging that the abnormal body exists if the amplitude of the signal of a certain measuring point relative to the signals of upper and lower measuring points exceeds a second set range, and determining the depth of the measuring point as the burial depth of the center of the abnormal body so as to realize the detection of the abnormal body and the burial depth of the abnormal body, wherein the detection result has higher accuracy.
Drawings
FIG. 1 is a flow chart of an urban tunnel anomaly detection method based on a small loop source hole transient electromagnetism according to an embodiment;
FIG. 2 is a plan view of the relative positions of the transmitter coils, the borehole, and the tunnel in one embodiment;
FIG. 3 is a schematic cross-sectional view of the relative positions of the transmitter coils, survey boreholes, receiver points, geological formations, tunnels, etc. in one embodiment;
FIG. 4 is a schematic cross-sectional view of multiple traces for determining the presence or absence of an anomaly in one embodiment;
FIG. 5 is a schematic diagram of the lateral positioning of a poor geologic body in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, fig. 1 is a flowchart of an urban tunnel abnormal body detection method based on a small loop source ground hole transient electromagnetic according to an embodiment, and includes the following steps:
s10, selecting the exploration drill holes in a first set range in front of the tunnel face as selected exploration drill holes on the ground along the central axis of the tunnel according to the stop position of the tunnel face, and determining the description information of the selected exploration drill holes; the description information includes the coordinates of the corresponding survey borehole, the depth of the hole and the horizontal distance to the face.
The set range may be within 100m from the tunnel face. The steps can select the exploration drilling holes in the range of 100m from the tunnel face in front of the tunnel face along the central axis of the tunnel on the ground according to the stop position of the tunnel face, and determine the coordinates, the hole depth and the horizontal distance from the tunnel face of the exploration drilling holes according to the existing recorded data of the selected exploration drilling holes.
S30, setting the initial transmitting coil Tx with the selected exploration borehole as the center0To the initial transmitting coil Tx0A step current is applied to generate a transient electromagnetic field in the subsurface.
Specifically, the side length of the transmission loop (transmission coil, such as the initial transmission coil Tx) can be determined according to the selected surface field of the borehole0) The side length is generally not 5m to 10m, the larger the side length of the return wire is, the deeper the detection depth is, and if the field space allows, a square coil with the side length of 10m is adopted as the transmitting return wire as much as possible.
In one example, the above steps are first centered on the selected survey borehole, and the first transmit coil Tx is arranged centered on the survey borehole as shown in fig. 20(initial transmitting coil Tx0) I.e. the central point of the coil is positioned at the position of an exploration drill hole, and the transient electromagnetic field is induced underground by passing step current.
S40, sequentially placing the 3-component probes into a plurality of drill holes related to the selected exploration drill holes, and receiving electromagnetic response information of the induced transient electromagnetic field point by point at fixed intervals; the electromagnetic response information includes a signal response of an induced electromotive force or an induced magnetic field decaying with time.
In one example, referring to fig. 3, a 3-component probe may be placed in a selected survey borehole, and an induced electromotive force inducing a transient electromagnetic field or a signal response of a decay of an induced magnetic field with time is received point by point at regular intervals in a longitudinal direction as shown in fig. 3, and a point distance between points is in a range of 1m to 5m, and generally, a detection resolution is higher as the point distance is smaller, as determined by a detection accuracy.
S50, controlling the initial transmitting coil Tx0The method comprises the steps of emitting electromagnetic waves, receiving signals point by point from shallow to deep in a selected exploration drilling hole, drawing multi-channel profile curves of a plurality of time points by taking the position of a measuring point of the selected exploration drilling hole as a horizontal coordinate and the signal response amplitude as a vertical coordinate, obtaining each initial multi-channel profile curve, judging that an abnormal body does not exist if the amplitude of a signal of each measuring point is uniformly changed in each initial multi-channel profile curve, judging that the abnormal body exists if the amplitude of the signal of a certain measuring point relative to the signals of upper and lower measuring points exceeds a second set range, and determining the depth of the measuring point as the burial depth of the center of the abnormal body.
The second setting range may be set according to the detection accuracy.
In one example, Tx0The method comprises the steps that a coil (an initial transmitting coil Tx0) transmits, signals received point by point from shallow to deep in a selected exploration drilling hole are plotted, a multi-channel profile curve graph at different time is drawn by taking a measuring point position as a horizontal coordinate and a signal response amplitude as a vertical coordinate, if the amplitude of signals of each measuring point is uniformly changed and does not have large jump, an abnormal body (such as water-rich abnormity) does not exist, if the amplitude of signals of a certain measuring point is greatly changed relative to signals of upper and lower measuring points, an abnormal body (such as water-rich abnormity) exists, and the depth of the measuring point is the buried depth of the center of the abnormal body. As shown in the model of fig. 3, the volume of the anomaly is: 15X 5m with the center of the anomaly at Tx as shown in FIG. 12And the buried depth is 15m under the transmitting coil. At Tx 010 survey points are arranged at 5m intervals from top to bottom in a survey borehole at a central position. On the multi-channel profile curve chart shown in FIG. 4, the response amplitude at the point-15 m appears jump relative to other points, so that the existence of an abnormal body can be presumed, and the center of the abnormal body is buried by-15 m.
According to the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism, according to the stop position of the tunnel face, the exploration drill holes in the first set range in front of the tunnel face are selected from the ground along the central axis of the tunnel to serve as the selected exploration drill holes, the description information of the selected exploration drill holes is determined, and the initial transmitting coil Tx is arranged by taking the selected exploration drill holes as the center0To the initial transmitting coil Tx0Energizing a step current to generate a transient electromagnetic field in the subsurface, sequentially placing a 3-component probe into a plurality of boreholes associated with a selected survey borehole, receiving electromagnetic response information inducing the transient electromagnetic field point by point at fixed intervals, and controlling the initial transmitting coil Tx0Transmitting electromagnetic waves, receiving signals point by point from shallow to deep in a selected exploration drilling hole, drawing multi-channel profile curves of a plurality of time points by taking the measuring point position of the selected exploration drilling hole as a horizontal coordinate and the signal response amplitude as a vertical coordinate to obtain each initial multi-channel profile curve, and in each initial multi-channel profile curve, if the amplitude of each measuring point signal is uniformly changed, judging that no abnormal body exists, if a certain measuring point signal is relatively up and down, determining that an abnormal body exists, and if the certain measuring point signal is relatively up and downAnd if the amplitude of the signal of the measuring point exceeds the second set range, judging that an abnormal body exists, and determining the depth of the measuring point as the burial depth of the center of the abnormal body so as to realize the detection of the abnormal body and the burial depth thereof, wherein the detection result has higher accuracy.
In one embodiment, the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further includes:
s60, arranging the first middle coils Tx in sequence on the circumference of the target exploration drilling hole as the center of circle1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Sequentially controlling the first intermediate coil Tx1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Determining signals received in the target exploration drilling holes when the electromagnetic waves are transmitted by the intermediate coils according to the step S40; the target survey borehole is a selected survey borehole in which an anomalous body exists;
and S70, respectively determining a multi-channel profile curve chart corresponding to signals received by the target exploration drill holes when each intermediate coil transmits electromagnetic waves, obtaining each intermediate multi-channel profile curve chart, and determining the direction information of the abnormal body relative to the tunnel according to each intermediate multi-channel profile curve chart.
Specifically, determining the orientation information of the anomaly relative to the tunnel according to each intermediate multi-trace profile graph comprises the following steps:
determining the amplitude of the signal generated by each intermediate coil at the point in the borehole of the target survey from each intermediate multi-trace profile, if the signal is generated by the first intermediate coil Tx1If the amplitude of the generated signal is maximum, the abnormal body is judged to be positioned in the tunnel, and a first middle coil Tx is arranged1If the amplitude of the signal generated from the second intermediate coil Tx2 is the maximum, the second intermediate coil Tx is abnormally placed in the middle2If from the third intermediate coil Tx3If the amplitude of the generated signal is maximum, the third middle coil Tx is abnormally arranged in the tunnel3If from the fourth intermediate coil Tx4The amplitude of the generated signal is maximum, thenThe fourth intermediate coil Tx is arranged in the tunnel in an abnormal position4In the direction of (a).
Further, the orientation information of the anomaly with respect to the tunnel includes a longitudinal position and a spatial occurrence orientation of the anomaly.
In one example, the borehole may be surveyed around a target, with Tx arranged sequentially as shown in FIG. 21、Tx2、Tx3、Tx4The 4 transmitting coils are sequentially transmitted, and signals are received in the survey borehole in accordance with step S40. Specifically, the first intermediate coil Tx1May be arranged right in front of the tunnel, a second intermediate coil Tx2 may be arranged right in front of the tunnel, and a third intermediate coil Tx3May be arranged at the front left of the tunnel. In the detection process, 4 transmitting coils (first intermediate coil Tx)1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4) The received data are respectively drawn into a multi-trace section diagram according to the step S50, generally, the induction signal generated by the transmitting coil closest to the abnormal body is strongest, and the induction signal generated by the transmitting coil farthest to the abnormal body is weakest, therefore, the transmitting coil closest to the abnormal body can be determined according to the relative magnitude of the signal response amplitude of the 4 transmitting coils, so as to determine the spatial occurrence position of the abnormal body, if Tx is used, the spatial occurrence position of the abnormal body is determined1If the amplitude of the generated signal is maximum, the anomaly is located at the right front of the tunnel, if Tx2The amplitude of the generated signal is maximum, and the anomaly is located right in front of the tunnel if the signal is Tx3And if the amplitude of the generated signal is maximum, the abnormity is positioned at the left front part of the tunnel.
In one embodiment, the second intermediate coil Tx2The tunnel face is arranged in the tunnel;
the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further comprises the following steps:
detecting whether the abnormal body is positioned between the target exploration drilling hole and the tunnel face according to the orientation information of the abnormal body relative to the tunnel, and if the abnormal body is positioned between the target exploration drilling hole and the tunnel face, performing second intermediate coil Tx2The right side of the return line is fixed towards the palm surfaceAnd continuously arranging n ultimate transmitting coils at regular intervals till the position right above the tunnel face, receiving signals in a target exploration drilling hole when each n ultimate transmitting coils transmits electromagnetic waves, and determining the horizontal distance of the abnormal body from the tunnel face through the multi-channel profile curve diagrams corresponding to the n ultimate transmitting coils respectively.
In one example, after preliminary determination of the longitudinal position, spatial orientation of the anomaly, if the anomaly is between the survey borehole and the face, as shown in FIG. 2, at Tx2The transmission return line Tx is continuously arranged at a fixed interval towards the direction of the tunnel face from the right side of the transmission return line21、Tx22、Tx23……Tx2nThe (n ultimate transmitting coils) are arranged right above the face, the interval is generally 2 m-10 m, the higher the resolution is, the smaller the interval is, the higher the resolution is, the more the interval is, for each transmitting coil, the receiving is carried out in the exploration drilling hole according to the step S40, and the horizontal distance between the abnormal body and the face is determined through the comparison of the data received by different transmitting coils.
Further, at Tx respectively21、Tx22、Tx23……Tx2nTransmitting with the position of the tunnel face as the origin of coordinates and Tx21、Tx22、Tx23……Tx2nThe central point of the transmitting coil is an abscissa, a multi-channel profile curve graph of an observation point in the exploration borehole is drawn, the abscissa corresponding to the curve extreme point generally corresponds to the transverse position of the center of the abnormal body, and the abscissa of the curve extreme point is the horizontal distance between the abnormal body and the tunnel face. As shown in fig. 4, the tunnel is buried 20m deep, and the tunnel face is located at 0 m; the abnormal body is 15 multiplied by 5m, the buried depth is 20m, and the abnormal body is positioned at the position of 60 m; the drilling hole depth is 50m and is positioned at 80 m. 10 measuring points are arranged in the drill hole from top to bottom at intervals of 5m, transmitting coils are arranged on the ground from 80m to the tunnel face at intervals of 10m, and the coils are squares with the side length of 10 m. On a multi-channel profile drawn according to observation data at the position 0m of the exploration drilling hole, the amplitude value at the position 60m is obviously higher than that at other positions, so that the abnormal body can be inferred to be positioned at the position 60m in front of the tunnel face.
Further, a schematic diagram of the lateral positioning of the good geologic body can be seen with reference to fig. 5.
The urban tunnel abnormal body detection method based on the minicircular line source hole transient electromagnetism can be specially used for advanced prediction of water inrush, mud gushing, boulders and other geological disasters in the urban subway tunnel excavation process. The method completely depends on the exploration drilling hole constructed on the earth surface in the early stage of tunnel construction, a small square coil with the side length not more than 10m is laid around the exploration drilling hole to serve as a transmitting loop, the specific size of the side length of the coil is determined according to the situation of the site, and the larger the side length is, the better the side length is under the allowable condition of the site; the measuring points are completely arranged in the exploration drilling hole, a three-component magnetic probe is adopted for receiving point by point, the point distance of the measuring points is 1-5 m, the specific point distance is determined according to the detection precision requirement, and the point distance is small when the detection precision requirement is high. During abnormal interpretation, longitudinal accurate positioning of the unfavorable geologic body is realized through comparison of induced electromotive force response values or magnetic induction intensity response values of all measuring points in the exploration drilling, and accurate positioning of spatial occurrence positions (such as left front, right front and right front positions of the tunnel face) of the unfavorable geologic body is realized through combination of different positions of the transmitting loop and the exploration drilling.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be noted that the terms "first \ second \ third" referred to in the embodiments of the present application merely distinguish similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A city tunnel abnormal body detection method based on small loop source ground hole transient electromagnetism is characterized by comprising the following steps:
s10, selecting the exploration drill holes in a first set range in front of the tunnel face as selected exploration drill holes on the ground along the central axis of the tunnel according to the stop position of the tunnel face, and determining the description information of the selected exploration drill holes; the description information comprises coordinates, hole depths and horizontal distances from the tunnel face of corresponding exploration drilling holes;
s30, setting the initial transmitting coil Tx with the selected exploration borehole as the center0To the initial transmitting coil Tx0Passing a step current to generate a transient electromagnetic field in the subsurface;
s40, sequentially placing the 3-component probes into a plurality of drill holes related to the selected exploration drill holes, and receiving electromagnetic response information of the induced transient electromagnetic field point by point at fixed intervals;
s50, controlling the initial transmitting coil Tx0Transmitting electromagnetic waves, receiving signals point by point from shallow to deep in a selected exploration drilling hole, drawing multi-channel profile curves of a plurality of time points by taking the measuring point position of the selected exploration drilling hole as a horizontal coordinate and the signal response amplitude as a vertical coordinate to obtain each initial multi-channel profile curve, and in each initial multi-channel profile curve, if the signal amplitude of each measuring point is uniformly changedAnd if the amplitude of the signal of a certain measuring point relative to the signal of the upper and lower measuring points exceeds a second set range, judging that an abnormal body exists, and determining the depth of the measuring point as the burial depth of the center of the abnormal body.
2. The urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism as claimed in claim 1, characterized in that the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further comprises:
s60, arranging the first middle coils Tx in sequence on the circumference of the target exploration drilling hole as the center of circle1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Sequentially controlling the first intermediate coil Tx1A second intermediate coil Tx2The third intermediate coil Tx3And a fourth intermediate coil Tx4Determining signals received in the target exploration drilling holes when the electromagnetic waves are transmitted by the intermediate coils according to the step S40; the target survey borehole is a selected survey borehole in which an anomalous body exists;
and S70, respectively determining a multi-channel profile curve chart corresponding to signals received by the target exploration drill holes when each intermediate coil transmits electromagnetic waves, obtaining each intermediate multi-channel profile curve chart, and determining the direction information of the abnormal body relative to the tunnel according to each intermediate multi-channel profile curve chart.
3. The urban tunnel anomaly detection method based on small loop source hole transient electromagnetism according to claim 2, wherein determining the azimuth information of the anomaly relative to the tunnel according to each intermediate multi-channel profile graph comprises:
determining the amplitude of the signal generated by each intermediate coil at the point in the borehole of the target survey from each intermediate multi-trace profile, if the signal is generated by the first intermediate coil Tx1If the amplitude of the generated signal is maximum, the abnormal body is judged to be positioned in the tunnel, and a first middle coil Tx is arranged1If the amplitude of the signal generated by the second intermediate coil Tx2 is the largest, it is abnormalIn the direction in which the second intermediate coil Tx2 is disposed, if composed of the third intermediate coil Tx3If the amplitude of the generated signal is maximum, the third middle coil Tx is abnormally arranged in the tunnel3If from the fourth intermediate coil Tx4If the amplitude of the generated signal is maximum, the fourth middle coil Tx is abnormally arranged in the tunnel4In the direction of (a).
4. The urban tunnel abnormal body detection method based on small loop source hole transient electromagnetism as claimed in claim 2, characterized in that second intermediate coil Tx2The tunnel face is arranged in the tunnel;
the urban tunnel abnormal body detection method based on the small loop source hole transient electromagnetism further comprises the following steps:
detecting whether the abnormal body is positioned between the target exploration drilling hole and the tunnel face according to the orientation information of the abnormal body relative to the tunnel, and if the abnormal body is positioned between the target exploration drilling hole and the tunnel face, performing second intermediate coil Tx2The right side of the return line is continuously provided with n ultimate transmitting coils at fixed intervals towards the direction of the tunnel face, the ultimate transmitting coils are arranged right above the tunnel face, when each n ultimate transmitting coils transmits electromagnetic waves, signals are received in a target exploration drill hole, and the horizontal distance from the abnormal body to the tunnel face is determined through the multi-channel profile curves corresponding to the n ultimate transmitting coils respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113960677A (en) * | 2021-10-26 | 2022-01-21 | 北京卫星环境工程研究所 | Method for rapidly judging inclination direction of target body |
| CN113960677B (en) * | 2021-10-26 | 2023-09-15 | 北京卫星环境工程研究所 | A method to quickly determine the tilt direction of a target object |
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| CN119511382B (en) * | 2024-11-15 | 2025-05-06 | 中国矿业大学 | Magnetic monopole drilling transient electromagnetic omnibearing intelligent recognition method |
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