CN108414125A - A kind of measuring system and method for underworkings concrete spray coating internal stress - Google Patents
A kind of measuring system and method for underworkings concrete spray coating internal stress Download PDFInfo
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- CN108414125A CN108414125A CN201711463772.9A CN201711463772A CN108414125A CN 108414125 A CN108414125 A CN 108414125A CN 201711463772 A CN201711463772 A CN 201711463772A CN 108414125 A CN108414125 A CN 108414125A
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- stress
- stress meter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to mechanical performance of concrete experimental technique fields, disclose a kind of measuring system and its measurement method of coal mine down-hole tunnel concrete spray coating internal stress, it includes the stress meter being embedded in the concrete spray coating of tunnel, and the frequency tester with the stress meter detachable connection.The measuring system and its measurement method of coal mine down-hole tunnel concrete spray coating internal stress provided by the present invention are by the way that stress meter to be fixed at measuring point in advance, then gunite concrete is fully embedded in spray-up, the data for finally frequency tester being used to survey the stress meter are acquired, directly obtain the size of spray-up stress, the apparatus structure is simple, experiment process is time saving and energy saving, and test result is accurately easy to get.
Description
Technical field
The present invention relates to mechanical performance of concrete experimental technique fields, more particularly to a kind of coal mine down-hole tunnel concrete
The measuring system of spray-up internal stress and a kind of measurement method of coal mine down-hole tunnel concrete spray coating internal stress.
Background technology
Anchor sprayed concrete combined supporting (abbreviation bolt-spary supports) is that current ground is applied most with the geotechnical engineering of underground
For one of extensive surrounding rock supporting technology.In coal mine field, bolt-spary supports is usually used in pit shaft, shaft station and main developing, standard
The permanent support in standby tunnel.In coal mine down-hole tunnel construction site, concrete ejection to the country rock for having set anchor pole, anchor cable
On, setting and hardening plays resistance mine jointly at concrete spray coating with country rock and anchor shaft anchor cable tight bond after a period of time
The effect of mountain pressure.Concrete spray coating is influenced during playing support action due to being squeezed by country rock, inside will produce
Stress, vertical working axial (i.e. tunnel radial direction) axial along tunnel and tangentially etc. three directions can all be divided along tunnel
Cloth forms three kinds of axial stress, radial stress and tangential stress internal stress.
Currently, many underground coal mines have " heavy dressing work, light monitoring ", i.e., after the completion of construction of anchor shotcreting, do not weigh
It is monitored depending on the stress to spray-up, leads to that tunnel cannot be grasped in time to press, do not take preventive measures, spray-up will
Stripping, or even cracking gradually are generated with country rock or anchor shaft anchor cable, the effect for causing it that can not play closing aqueous vapor, support country rock,
It may finally cause roof accident, cause casualties and lost with engineering.Therefore, concrete spray coating internal stress is accurately measured
Size and Orientation, to understanding spray-up actual forced status, instructing Concrete Injection Rock Bolting Design In Openings, guarantee roadway support safety very heavy
It wants.
Invention content
(1) technical problems to be solved
It is an object of the present invention to provide a kind of surveys of practical, effective coal mine down-hole tunnel concrete spray coating internal stress
Amount method must not understand spray-up actual forced status with solution, not take preventive measures in time, and spray-up is caused to crack, and draw
The problem of playing roof accident improves the safe coefficient of the science and tunnel of bolt-spary supports design.
It is a further object to provide a kind of practical, effective coal mine down-hole tunnel concrete spray coating internal stress
Measuring system must not understand spray-up actual forced status with solution, not take preventive measures in time, and spray-up is caused to crack,
The problem of causing roof accident improves the safe coefficient of the science and tunnel of bolt-spary supports design.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of surveys of coal mine down-hole tunnel concrete spray coating internal stress
Amount system comprising the stress meter being embedded in the concrete spray coating of tunnel, and the frequency with the stress meter detachable connection
Rate detector.
Wherein, the stress meter includes pressure-bearing plectane, sensing head, and for connecting the pressure-bearing plectane and the sensing
The conduit of head, the stress meter further includes the signal cable being connect with the sensing head.
Wherein, the ratio between thickness H and radius R of the pressure-bearing plectane≤0.2.
Wherein, the ratio between the equivalent elastic modulus Eg of the stress meter and the elastic modulus E c of tunnel concrete spray coating >=0.8.
The invention also discloses a kind of measurement methods of coal mine down-hole tunnel concrete spray coating internal stress comprising following step
Suddenly：
(1) fixation pressure meter：Before gunite concrete, the pressure-bearing plectane of stress meter is first fixed on the lane at tested point
On road metal mesh；
(2) gunite concrete buries pressure gauge：The concrete slurry being stirred in advance is sprayed to roadway surrounding rock surface, and
So that the pressure-bearing plectane of stress meter is fully embedded in concrete spray coating；
(3) it surveys and reads spray-up stress data：The original frequency f in underworkings is measured by frequency tester0, then by it
It is connect with the signal cable of stress meter, the real-time frequency f of stress meter is acquired by frequency tester, stress is calculated by following formula
The spray-up stress of the embedded point of meter：
In formula：P is concrete spray coating internal stress, MPa；F and f0Real-time frequency respectively measured by frequency tester and
Original frequency, Hz；A and B is respectively the manufacture calibration coefficient of stress meter, MPa/Hz2Or MPa/Hz.
Wherein, the stress meter includes spray-up axial stress meter, the work of the pressure-bearing plectane of the spray-up axial stress meter
Face vertical working is axially installed.
Wherein, the stress meter further includes spray-up radial stress meter, the work of the pressure-bearing plectane of the spray-up radial stress meter
Make face vertical working radially to install.
Wherein, the stress meter further includes spray-up tangential stress meter, the work of the pressure-bearing plectane of the spray-up tangential stress meter
Make face radially to install along tunnel.
Wherein, the conduit of the spray-up tangential stress meter includes and pressure-bearing plectane the first conduit part connected vertically and second
Conduit part, first conduit part and second conduit part are in 90 degree of angles.
Wherein, it is enclosed with Tarpauling outside the sensing head of the stress meter.
(3) advantageous effect
The measuring system and its measurement method of coal mine down-hole tunnel concrete spray coating internal stress provided by the present invention pass through
Stress meter is fixed at measuring point in advance, then gunite concrete is fully embedded in spray-up, finally uses frequency tester
The data surveyed to the stress meter are acquired, and directly obtain the size of spray-up stress, and the apparatus structure is simple, tests
Journey is time saving and energy saving, and test result is accurately easy to get.
Description of the drawings
Fig. 1 shows one of the measuring system of a kind of coal mine down-hole tunnel concrete spray coating internal stress according to the present invention
The schematic diagram of preferred embodiment；
Fig. 2 is the A-A sectional views in Fig. 1；
Fig. 3 is the B-B sectional views in Fig. 1；
Fig. 4 shows the structure of the stress meter of the measuring system of the coal mine down-hole tunnel concrete spray coating internal stress in Fig. 1
Schematic diagram；
Fig. 5 shows the frequency detecting of the measuring system of coal mine down-hole tunnel concrete spray coating internal stress according to the present invention
The structural schematic diagram of instrument.
In figure, 1：Stress meter；1A：Spray-up axial stress meter；1B：Spray-up radial stress meter；1C：Spray-up tangential stress meter；
11：Pressure-bearing plectane；12：Sensing head；13：Conduit；14：Signal cable；2：Tunnel；3：Country rock；4：Spray-up；5：Detector.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Following instance
For illustrating the present invention, but it is not limited to the scope of the present invention.
In the description of the present invention, unless otherwise indicated, the meaning of " plurality " is two or more.Term "upper",
"lower", "left", "right", "inner", "outside", " front end ", " rear end ", etc. instructions orientation or positional relationship be it is based on ... shown in the drawings
Orientation or positional relationship is merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated device or
Element must have a particular orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
Fig. 1 shows one of the measuring system of a kind of coal mine down-hole tunnel concrete spray coating internal stress according to the present invention
Preferred embodiment.As shown, the measuring system includes the stress meter 1 being embedded in 2 concrete spray coating 4 of tunnel, and with answer
The frequency tester 5 of 1 detachable connection of power meter.Specifically, as shown in figure 4, the stress meter 1 includes pressure-bearing plectane 11, sensing
First 12, and the conduit 13 for connecting pressure-bearing plectane 11 and sensing head 12, in addition, the stress meter 1 further includes and sensing head 12
The signal cable 14 of connection.Wherein, pressure-bearing plectane 11 is the sensing unit being stressed directly, and intracavitary is full of incompressible, vacuum degree
Higher fluid leads to sensing head 12 by conduit 13.After pressure-bearing 11 forced compression of plectane, Fluid pressure uniformly acts on
On the flexible sheet of sensing head 12, it is allowed to deflection deformation；The string wire stress that one end is fixed on flexible sheet is controlled by it and becomes
Change, the natural frequency of vibration of string also changes.
Preferably, the ratio between thickness H and radius R of pressure-bearing plectane 11≤0.2；And the equivalent elastic modulus of preferred stress meter 1
The ratio between Eg and the elastic modulus E c of tunnel concrete spray coating >=0.8, i.e. the stress meter 1 has the characteristics that thin form, rigidity are big, because
This makes in the 1 Transducers Embedded in Concrete spray-up 4 of stress meter the primary stress field on spray-up 4 influence very little, and the data measured can be compared with
The truly spray-up stress value at the embedded point of reflection stress meter 1.
The invention also discloses a kind of measurement methods of underworkings concrete spray coating internal stress comprising following steps：
(1) fixation pressure meter 1：Before gunite concrete, in different directions by the pressure-bearing plectane 11 of stress meter 1 first
(axially, radially and tangentially) is fixed on iron wire on the metal mesh in the tunnel 2 at tested point, as shown in Figure 1 to Figure 3.Wherein, it uses
It is axially installed in the working face vertical working 2 of the pressure-bearing plectane 11 for the spray-up axial stress meter 1A for measuring spray-up axial stress；With
It is installed in 2 radial direction of working face vertical working of the pressure-bearing plectane 11 for the spray-up radial stress meter 1B for measuring spray-up radial stress；With
It is installed along 2 radial direction of tunnel in the working face of the pressure-bearing plectane 11 for the spray-up tangential stress meter 1C for measuring spray-up tangential stress；
(2) gunite concrete buries pressure gauge：The concrete slurry being stirred in advance is sprayed to 3 surface of roadway surrounding rock,
And the pressure-bearing plectane 11 of stress meter 1 is fully embedded in concrete spray coating 4, when gunite concrete, wants proof stress meter 1 to fix
Motionless, direction is constant；
(3) it surveys and reads spray-up stress data：First by (such as the GSJ-2A types frequency tester 5, such as Fig. 5 institutes of frequency tester 5
Show) underworkings 2 is taken, the original frequency f of detector is recorded in environment at the scene0, then by the signal electricity of itself and stress meter 1
Cable 14 connects, and the real-time frequency f of 5 automatic collection stress meter 1 of frequency tester has acquired original frequency f0After real-time frequency f,
The spray-up stress value of the embedded point of stress meter 1 is found out by following formula.
In formula：P is concrete spray coating internal stress, MPa；F and f0Real-time frequency respectively measured by frequency tester and
Original frequency, Hz；A and B is respectively the manufacture calibration coefficient of stress meter 1, MPa/Hz2Or MPa/Hz.
Sensing head 12 and signal cable 14 are damaged when to avoid concrete ejection, and sensing head 12 is wrapped with Tarpauling,
And signal cable 14 is led into unaffected region along 2 bottom of tunnel.
Further, for the ease of the pressure-bearing plectane 11 of arrangement spray-up tangential stress meter 1C, preferably spray-up tangential stress meter
The conduit 13 of 1C include for 11 first conduit part connected vertically of pressure-bearing plectane and the second conduit part, wherein the first conduit
Portion and the second conduit part are in 90 degree of angles.
The present invention is axial by vertical working 2, vertical working 2 is radial, arranges stress meters along three directions such as 2 radial directions of tunnel
Pressure-bearing plectane 11, spray-up axial stress, radial stress and tangential stress can be measured respectively, to grasp spray-up 4 comprehensively
Stress.It should be noted that it will be understood by those of skill in the art that the present invention some other embodiment in,
It can be only with one or both of spray-up axial stress meter 1A, spray-up radial stress meter 1B and spray-up tangential stress meter 1C.
In addition, pressure-bearing plectane 11 can also use other shapes, such as rectangle etc..
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of measuring system of coal mine down-hole tunnel concrete spray coating internal stress, which is characterized in that mixed including being embedded in tunnel
Stress meter in solidifying soil spray-up, and the frequency tester with the stress meter detachable connection.
2. measuring system according to claim 1, which is characterized in that the stress meter includes pressure-bearing plectane, sensing head, with
And the conduit for connecting the pressure-bearing plectane and the sensing head, the stress meter further include the letter being connect with the sensing head
Number cable.
3. measuring system according to claim 2, which is characterized in that the ratio between thickness H and radius R of the pressure-bearing plectane≤
0.2。
4. measuring system according to any one of claim 1-3, which is characterized in that the Equivalent Elasticity mould of the stress meter
Measure the ratio between Eg and the elastic modulus E c of tunnel concrete spray coating >=0.8.
5. a kind of measurement method of coal mine down-hole tunnel concrete spray coating internal stress, which is characterized in that include the following steps：
(1) fixation pressure meter：Before gunite concrete, the pressure-bearing plectane of stress meter is first fixed on the gold of the tunnel at tested point
Belong to online；
(2) gunite concrete buries pressure gauge：The concrete slurry being stirred in advance is sprayed to roadway surrounding rock surface, and is made
The pressure-bearing plectane of stress meter is fully embedded in concrete spray coating；
(3) it surveys and reads spray-up stress data：The original frequency f in underworkings is measured by frequency tester0, then by its with answer
The signal cable of power meter connects, and the real-time frequency f of stress meter is acquired by frequency tester, stress meter is calculated by following formula and buries
The spray-up stress to set up an office：
In formula：P is concrete spray coating internal stress, MPa；F and f0Real-time frequency respectively measured by frequency tester and initial frequency
Rate, Hz；A and B is respectively the manufacture calibration coefficient of stress meter, MPa/Hz2Or MPa/Hz.
6. measurement method according to claim 5, which is characterized in that the stress meter includes spray-up axial stress meter, institute
The working face vertical working for stating the pressure-bearing plectane of spray-up axial stress meter is axially installed.
7. measurement method according to claim 6, which is characterized in that the stress meter further includes spray-up radial stress meter,
The working face vertical working of the pressure-bearing plectane of the spray-up radial stress meter is radially installed.
8. measurement method according to claim 7, which is characterized in that the stress meter further includes spray-up tangential stress meter,
The working face of the pressure-bearing plectane of the spray-up tangential stress meter is radially installed along tunnel.
9. measurement method according to claim 8, which is characterized in that the conduit of the spray-up tangential stress meter includes and holds
Press plectane the first conduit part connected vertically and the second conduit part, first conduit part and second conduit part in 90 degree of folders
Angle.
10. according to the measurement method described in any one of claim 5-9, which is characterized in that outside the sensing head of the stress meter
Portion is enclosed with Tarpauling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711463772.9A CN108414125A (en) | 2017-12-28 | 2017-12-28 | A kind of measuring system and method for underworkings concrete spray coating internal stress |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711463772.9A CN108414125A (en) | 2017-12-28 | 2017-12-28 | A kind of measuring system and method for underworkings concrete spray coating internal stress |
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| CN108414125A true CN108414125A (en) | 2018-08-17 |
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| CN201711463772.9A Pending CN108414125A (en) | 2017-12-28 | 2017-12-28 | A kind of measuring system and method for underworkings concrete spray coating internal stress |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228107A (en) * | 2020-09-28 | 2021-01-15 | 中煤科工开采研究院有限公司 | Detection method and system for sealing spray layer for roadway support |
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|---|---|---|---|---|
| CN105332739A (en) * | 2015-10-14 | 2016-02-17 | 同济大学 | Tunnel supporting structure stress monitoring device and method |
| CN205919913U (en) * | 2016-06-30 | 2017-02-01 | 中电建路桥集团有限公司 | Tunnel lining structure stress monitor cell's fixed bolster |
| CN206299391U (en) * | 2016-11-29 | 2017-07-04 | 中国电建集团华东勘测设计研究院有限公司 | A kind of underground engineering concrete spray coating pressure monitoring structure |
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2017
- 2017-12-28 CN CN201711463772.9A patent/CN108414125A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105332739A (en) * | 2015-10-14 | 2016-02-17 | 同济大学 | Tunnel supporting structure stress monitoring device and method |
| CN205919913U (en) * | 2016-06-30 | 2017-02-01 | 中电建路桥集团有限公司 | Tunnel lining structure stress monitor cell's fixed bolster |
| CN206299391U (en) * | 2016-11-29 | 2017-07-04 | 中国电建集团华东勘测设计研究院有限公司 | A kind of underground engineering concrete spray coating pressure monitoring structure |
Non-Patent Citations (1)
| Title |
|---|
| 方树林等: "锚喷支护软岩大巷混凝土喷层受力监测与分析", 《采矿与安全工程学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112228107A (en) * | 2020-09-28 | 2021-01-15 | 中煤科工开采研究院有限公司 | Detection method and system for sealing spray layer for roadway support |
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Application publication date: 20180817 |
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