CN108828678B

CN108828678B - Advanced geological detection system for tunnel construction

Info

Publication number: CN108828678B
Application number: CN201810976081.7A
Authority: CN
Inventors: 林光琴
Original assignee: ANHUI TESTING CENTER FOR HIGHWAY ENGINEERING
Current assignee: ANHUI TESTING CENTER FOR HIGHWAY ENGINEERING
Priority date: 2018-08-25
Filing date: 2018-08-25
Publication date: 2020-05-29
Anticipated expiration: 2038-08-25
Also published as: CN108828678A

Abstract

A tunnel construction advanced geological exploration system comprising: a power supply positive electrode arranged on the TBM construction machine; the detection electrode is arranged on the first moving channel and can move forward along the moving channel along the tunneling direction; the power supply negative electrode is arranged on the second moving channel and can move forward along the second moving channel along the tunneling direction; the data acquisition module is used for acquiring signals of the detection electrodes; the communication module transmits the acquired data signals to the data processing host; and the data processing host determines the geological condition in front of the tunnel construction according to the data signals transmitted by the communication module. By the method, structures containing water guide, such as fault broken zones and karst caves in front of tunnel faces, can be forecasted and identified in advance, and the construction safety of tunnels is guaranteed.

Description

Advanced geological detection system for tunnel construction

Technical Field

The invention relates to a geological detection system, in particular to a leading geological detection system for detecting the front water-containing condition in the tunnel construction process.

Background

With the rapid development of domestic highway, railway, water conservancy, mine and other engineering construction, tunnel engineering also appears in large quantities. Before tunnel construction, due to the complex topography, large tunnel burial depth and limited ground surface exploration technology, unfavorable geological conditions along the line cannot be completely detected in the ground exploration stage, and the advanced forecasting method in the construction period cannot effectively forecast the water-containing structure. In the tunnel construction process, natural disasters such as collapse, water inrush and the like often occur due to geological problems. Therefore, the advanced prediction and quantitative identification research of the water-guiding structure such as the fault fracture zone in front of the tunnel face and the karst cave is carried out, is an urgent need for guaranteeing the construction safety of the tunnel, and has great theoretical significance and engineering value.

At present, geological analysis methods, seismic wave methods, geological radar methods, infrared water exploration methods and the like are used in the field of tunnel advanced detection, and all the methods have respective advantages and disadvantages. The geological analysis method infers the front geological condition through engineering geological investigation and analysis on the earth surface and in the tunnel, has high accuracy under the conditions of shallow tunnel burial depth and less complex structure, but the precision of the forecast result under the complex geological condition is difficult to guarantee. The seismic wave method has a good effect on forecasting lithological change and large faults in front of the tunnel face, but the observation mode is a straight line survey mode, wave velocity distribution in front of the tunnel face is difficult to obtain, faults with small included angles with the axis of the tunnel cannot be forecasted, and water in front of the tunnel cannot be forecasted. The geological radar method has the characteristics of high resolution, no damage, quick detection and data processing and flexibility, but has the biggest defect that the forecasting range is small and can only be controlled within 30 m. The infrared water detection method can judge the water-containing body by measuring and analyzing the temperature field distribution in the tunnel, can only qualitatively forecast whether the water-containing body exists in a certain range in front of the tunnel face, and is difficult to position.

Electrical prospecting is a method of exploring geological conditions such as formation lithology, geological structure, etc. by studying and observing changes in electric current. The induced polarization method is a geophysical exploration method for electrical exploration, and can measure parameters such as resistivity, polarizability, half-decay time, attenuation degree and the like on the basis of the difference of induced electrical parameters among different geological media, wherein the resistivity parameter is sensitive to the response of a water body, and the half-decay time represents that induced polarization attenuation information has a certain relation with the water volume of the water body. By analyzing and inverting parameters such as polarizability, resistivity, half-decay time difference and the like in the induced polarization method, the resistivity and polarizability structure of the rock body in front of the face can be obtained, and important reference is provided for advanced geological prediction. In the prior art, when the induced polarization method is used for advanced detection, a power supply positive electrode is usually arranged on the tunneling machine, a measuring electrode is arranged on the side wall of a tunnel, a power supply negative electrode is arranged at an infinite distance behind the tunnel, and the excitation current flows from the front of the power supply positive electrode to the power supply negative electrode; meanwhile, as the heading machine advances, the distance between the measuring electrode and the power supply electrode changes, and resistivity and polarizability changes caused by the distance change can interfere with resistivity and polarizability changes caused by geological environment changes.

Disclosure of Invention

The invention provides a tunnel construction advanced geological detection system which can solve the problems in the prior art.

As an aspect of the present invention, there is provided a tunnel construction advanced geological detection system, comprising: a power supply positive electrode arranged on the TBM construction machine; the first moving channel is arranged on an upper ground soil layer in front of a tunnel face in the tunnel construction direction and is arranged along the tunneling direction; the detection electrode is arranged on the first moving channel and can move forward along the moving channel along the tunneling direction; a second moving tunnel provided in front of the first moving tunnel along a tunneling direction; the power supply negative electrode is arranged on the second moving channel and can move forward along the second moving channel along the tunneling direction; the data acquisition module is connected with the detection electrode and is used for acquiring signals of the detection electrode; the communication module transmits the data signals acquired by the data acquisition module to the data processing host; and the data processing host determines the geological condition in front of the tunnel construction according to the data signals transmitted by the communication module.

Further, the probe electrode is a non-polarized electrode.

Further, the power supply positive electrode is arranged in front of the TBM construction machine.

Further, the communication module is a wireless communication module or a wired communication module.

Further, the probe electrode is T-shaped, and the lower part of the probe electrode is positioned in the first moving channel.

Further, the negative supply electrode is T-shaped, and the lower part of the negative supply electrode is positioned in the second moving channel.

Further, the detecting electrode comprises a plurality of electrodes at different positions.

Further, when tunneling detection is conducted, the detection electrode moves along the first moving channel at the same speed as the TBM construction machine through a moving device, and the power supply negative electrode moves along the second moving channel at the same speed as the TBM construction machine.

Further, the data processing host determines the water applying condition of the geologic body in front of the tunnel according to the change of the current signal of the detection electrode.

Further, the depth of the first moving channel is larger than that of the second moving channel.

Drawings

Fig. 1 is a schematic setting diagram of a tunnel construction advanced geological detection system according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. Moreover, it is to be understood that the features of the various embodiments described herein are not mutually exclusive and can exist in a wide variety of combinations and permutations.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Referring to fig. 1, the advanced geological detection system for tunnel construction according to the embodiment of the present invention is used for prejudging geological conditions near a tunnel face during tunnel engineering construction, and includes a positive power supply electrode 10, a detection electrode 20, a negative power supply electrode 30, a first moving channel 40, a second moving channel 50, a data acquisition module 60, a communication module 70, and a data processing host 80.

The positive power supply electrode 10 is a metal electrode and is connected with a direct current power supply for providing a forward focusing detection current. The positive power-supplying electrode 10 may be a ring electrode that is disposed in front of the TBM construction machine, advancing along the tunneling method during tunneling.

Along the direction of driving of the tunnel, a first moving tunnel 40 is provided in the ground layer above the tunnel. The detecting electrode 20 is used for collecting current or voltage signals generated by induced polarization, and is disposed on the first moving channel 40, and the distance between the detecting electrode 20 and the tunnel face may be, for example, 50-100 m. The detecting electrode 20 may be, for example, a "T" shape, and the detecting electrode 20 can be moved along the first moving channel 40 at the same speed as the TBM construction machine by a moving device such as a trolley. The sensing electrode 20 is a non-polarized electrode, and one or more sensing electrodes may be disposed in the first moving channel 40.

The second moving channel 50 is disposed in front of the first moving channel 40 in the tunneling direction, and the depth of the second moving channel 50 may be set to be smaller than that of the first moving channel 40. The power supply negative electrode 30 is a metal electrode, one end of which is disposed on the second moving channel 50, and the other end of which is connected to the power supply negative electrode through a wire. The distance between the power supply negative electrode 30 and the tunnel face may be, for example, 100 to 150 m. . The power supply negative electrode 30 may also be, for example, a "T" shape, and the power supply negative electrode 30 can be moved along the second moving channel 50 at the same speed as the TBM construction machine by a moving device such as a trolley.

The data acquisition module 60 is connected to the detecting electrode 20 and is used for acquiring signals of the detecting electrode 20. The communication module 70 transmits the data signal acquired by the data acquisition module 60 to the data processing host 80, and the communication module 70 may be a wireless communication module or a wired communication module. The data processing host 80 determines the apparent resistivity and the apparent polarizability in front of the tunnel face of the tunnel according to the received detection signal, the apparent resistivity of the front rock is reduced, when the apparent polarizability is increased, the water content of the front rock is increased, the apparent resistivity of the front rock is high, and when the apparent polarizability is low, the water content of the front rock is weak.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and are intended to be within the scope of the invention.

Claims

1. A tunnel construction advanced geological exploration system comprising: a power supply positive electrode arranged in front of the TBM construction machine; the first moving channel is arranged on an upper ground soil layer in front of a tunnel face in the tunnel construction direction and is arranged along the tunneling direction; the detection electrode is arranged on the first moving channel and can move forward along the moving channel along the tunneling direction; a second moving tunnel provided in front of the first moving tunnel along a tunneling direction; the power supply negative electrode is arranged on the second moving channel and can move forward along the second moving channel along the tunneling direction; the data acquisition module is connected with the detection electrode and is used for acquiring signals of the detection electrode; the communication module transmits the data signals acquired by the data acquisition module to the data processing host; the data processing host machine determines the geological condition in front of the tunnel construction according to the data signals transmitted by the communication module; and during tunneling detection, the detection electrode moves along the first moving channel at the same speed as the TBM construction machine through a moving device, and the power supply negative electrode moves along the second moving channel at the same speed as the TBM construction machine.

2. The advanced geological detection system for tunnel construction according to claim 1, wherein: the probe electrode is a non-polarized electrode.

3. The advanced geological detection system for tunnel construction according to claim 2, wherein: the detecting electrode comprises a plurality of electrodes at different positions.

4. The advanced geological detection system for tunnel construction according to claim 3, wherein: the power supply positive electrode is a metal electrode.

5. The advanced geological detection system for tunnel construction according to claim 4, wherein: the negative power supply electrode is a metal electrode.

6. The advanced geological detection system for tunnel construction according to claim 5, wherein: the communication module is a wireless communication module or a wired communication module.

7. The advanced geological detection system for tunnel construction according to claim 6, wherein: the probe electrode is "T" shaped with a lower portion located within the first moving channel.

8. The advanced geological detection system for tunnel construction according to claim 7, wherein: the negative supply electrode is T-shaped, and the lower part of the negative supply electrode is positioned in the second moving channel.

9. The advanced geological detection system for tunnel construction according to claim 8, wherein: and the data processing host determines the water applying condition of the geologic body in front of the tunnel according to the change of the current signal of the detection electrode.