CN103808807B - The measuring method in on-the-spot country rock micro rupture region - Google Patents
The measuring method in on-the-spot country rock micro rupture region Download PDFInfo
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- CN103808807B CN103808807B CN201210446277.8A CN201210446277A CN103808807B CN 103808807 B CN103808807 B CN 103808807B CN 201210446277 A CN201210446277 A CN 201210446277A CN 103808807 B CN103808807 B CN 103808807B
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Abstract
The present invention relates to the measuring method in a kind of on-the-spot country rock micro rupture region.It is an object of the invention to provide the measuring method in a kind of on-the-spot country rock micro rupture region, provide reliable foundation for the design of its support of deep-lying tunnel and the formulation of engineering treatment.The technical scheme is that the measuring method in on-the-spot country rock micro rupture region, it is characterised in that step is as follows: test hole that a, excavation are parallel to each other and auxiliary tunnel；B, being drilled with one group of boring from auxiliary tunnel to test hole, and install at least four acoustic emission sensor, each Sensor monitoring section is respectively positioned on the front of test hole face, and is all higher than the test Dong Dong footpath of 3 times to the distance testing hole face；C, excavate forward test hole with given pace, until test hole face is positioned at the front of Sensor monitoring section, and be more than the test Dong Dong footpath of 3 times to the distance of each monitoring section.The present invention is be applicable to underground rock project.
Description
Technical field
The present invention relates to the measuring method in a kind of on-the-spot country rock micro rupture region, be primarily adapted for use in underground rock project.
Background technology
China is greatly developing underground rock project at present, but the excavation of underground engineering will certainly cause stresses re-distribution, when exceeding when playing resistance to spalling of country rock, i.e. start in country rock that micro rupture occurs, forming Excavation damage zone territory in the range of the Zhou Yiding of hole, along with the continuous adjustment of stress, the micro rupture in country rock will start expansion, through, gross fracture may finally be formed, affect the stability in the large of underground engineering.This process is the link being all subjected in any underground excavation activity, therefore to the safety of engineering is with steady in a long-term, it is necessary to have the micro rupture of crackle in country rock and recognize clearly, it is judged that micro rupture region, instruct the optimization of supporting to design.
The yardstick of micro rupture is typically in cm or mm magnitude, and naked eyes are difficult to observe by this kind of tiny crackle.Can observe directly, by means of ultramicroscope, the micro rupture produced due to Stress relief at laboratory now, but this technology judges micro rupture unrealistic in practical engineering application.The measuring method evaluating damage zone at present at the scene includes sound wave, seismic wave, borehole camera etc., and owing to the micro rupture yardstick in country rock is less, and it is in compressive state, sound wave and borehole camera is utilized can not directly to measure and observe, profit is only capable of the scope measuring Determining Failure Zone of Surrounding Rock with the aforedescribed process, mean that micro rupture has formed macroscopical visible crackle, country rock alreadys more than peak strength, can not meet the requirement of surrounding rock stability early warning, the damage zone to country rock is caused to judge normally, it is impossible to effectively to instruct design of its support.And if able to measured the micro rupture scope of country rock by certain method, then can be improved the intensity of country rock by rational supporting measure, limit further expanding of country rock micro rupture, it is ensured that the stability of country rock.
Summary of the invention
The technical problem to be solved in the present invention is: for the measuring method in a kind of on-the-spot country rock micro rupture region of problem offer of above-mentioned existence, to measure the micro rupture region of country rock, analyze the damage development process of Wall Rock of Tunnel, analyze the state of rupture within country rock qualitatively, provide reliable foundation for the design of its support of deep-lying tunnel and the formulation of engineering treatment.
The technical solution adopted in the present invention is: the measuring method in on-the-spot country rock micro rupture region, it is characterised in that step is as follows:
A, the test hole that is parallel to each other of excavation and auxiliary tunnel, and the test Dong Dong footpath that distance between the two is more than 3 times；
B, from auxiliary tunnel to test hole be drilled with one group of boring, and at least four acoustic emission sensor is installed, the layout of acoustic emission sensor follows at least two Sensor monitoring sections of formation, and each section arranges the principle of at least two acoustic emission sensor, the most each acoustic emission sensor both passes through protolith district, and does not enter the area of stress concentration of country rock and country rock relaxes district；Each Sensor monitoring section is respectively positioned on the front of test hole face, and is all higher than the test Dong Dong footpath of 3 times to the distance testing hole face；
C, excavate forward test hole with given pace, until test hole face is positioned at the front of Sensor monitoring section, and be more than the test Dong Dong footpath of 3 times to the distance of each monitoring section.
Described test hole circular in cross-section, a diameter of 5-6m.
Described auxiliary tunnel cross section is the level land shape of a hoof, a size of 3m.
Each acoustic emission sensor is to the test Dong Dong footpath that distance is 0.5 ~ 1 times of test hole excavation contour line.
Distance between adjacent two sensors monitoring section is 2-3m.
The invention has the beneficial effects as follows: the present invention arranges one group of acoustic emission sensor on test driving path, hole, acoustic emission signal is utilized to determine micro rupture region, having the advantages such as interpretability is high, measuring accuracy is high, applied widely, the supporting optimum design being on-the-spot by means of the micro rupture region determined provides reliable reference with engineering treatment.
Accompanying drawing explanation
Fig. 1 is the plane graph of the present invention.
Fig. 2 is the profile of the present invention.
Detailed description of the invention
As shown in Figure 1 and Figure 2, the present embodiment Specific construction step is as follows:
A, the test hole 1 that is parallel to each other of excavation and auxiliary tunnel 2
The hole type (cross section) in test hole 1 is optimal with circle, a diameter of 5 ~ 6m；Size is the least, and to cause excavating the micro rupture region caused less, it is not easy to realizing being accurately positioned and catching of acoustie emission event, then cause difficulty of construction to increase too greatly, construction costs improves the most therewith.
Beyond Bei Dong footpath, distance test hole 1 three (referring to test the footpath, hole in hole), arrange auxiliary tunnel 2, so can avoid excavating the Stress relief area coincidence caused, affect final measurement result；Meanwhile, can not be too remote, otherwise hole spacing is oversize, the most uneconomical, and easily causes eccentric error, it is not easy to be accurately positioned.The hole type of auxiliary tunnel 2 does not has special requirement, and the level land shape of a hoof (cross section) is preferable, and not only difficulty of construction is low, holes and installs instruments and be the most more convenient, and the footpath, hole of auxiliary tunnel 2 reaches 3m, in order to installing to drilling construction and instrument provides working place.
B, it is drilled with boring 3 and install acoustic emission sensor 4
It is drilled with one group of boring 3 to test hole 1 from auxiliary tunnel 2, and acoustic emission sensor 4 is installed, in order to realize accurately catching and location of acoustie emission event, employing space is arranged, four acoustic emission sensors 4 of minimum needs, being arranged at least two section, each section arranges at least two acoustic emission instrument.In this example, arrange four borings 3 altogether, one acoustic emission sensor 4 of each layout bottom each boring 3, four acoustic emission sensors 4 form two Sensor monitoring sections and (are perpendicular to test hole and be parallel to test hole face, and the distance that two between monitoring section is 2-3m), each monitoring section is arranged two acoustic emission sensors 4.Each Sensor monitoring section is respectively positioned on the front (from the point of view of excavation direction) of test hole 1 face, and is all higher than the footpath, hole, test hole 1 of 3 times to the distance testing hole 1 face, in order to capture face effect completely.
The area of stress concentration of the layout country rock to be exceeded of each acoustic emission sensor 4 and country rock relax district's (be i.e. positioned at area of stress concentration and the country rock district that relaxes is peripheral), prevent country rock from producing and rupture the installation quality affecting acoustic emission sensor 4, cannot normally work, can not enter in protolith district 5 simultaneously, in case the acoustie emission event of fastening position is overflowed, it is impossible to all of acoustie emission event is accurately positioned；From the point of view of boring 3 is drilled with direction, it is simply that each acoustic emission sensor 4 needs guiding through protolith district 5, and do not enter the area of stress concentration of country rock and country rock relaxes district.In this example, each acoustic emission sensor 4 is to the footpath, hole, test hole 1 that distance is 0.5 ~ 1 times of test hole 1 excavation contour line.
C, with given pace forward excavate test hole 1, until test hole 1 face is positioned at the front of Sensor monitoring section, and to the distance of each monitoring section more than the footpath, hole, test hole 1 of 3 times (after distance reaches 3 Bei Dong footpaths, the acoustic emission phenomenon that Stress relief causes terminates substantially, now can stop monitoring), so as to capture complete micro rupture region.
Under external force, inside can crack rock type materials, causes the release suddenly of strain energy to produce elastic wave, can capture this elastic wave by acoustic emission instrument.The secondary causing stress is adjusted by tunnel excavation later, cause generation and the extension of crackle, it is gathered in the energy within country rock to be discharged by the form of elastic wave and propagate, and produce substantial amounts of acoustic emission information in the process, different size, multi-form micro rupture produced by acoustic emission signal strong and weak and feature is different, by the acoustic emission information that diverse location acoustic emission probe is captured, determine time, degree and the position ruptured.
Claims (4)
1. the measuring method in an on-the-spot country rock micro rupture region, it is characterised in that step is as follows:
A, the test hole (1) that is parallel to each other of excavation and auxiliary tunnel (2), and distance between the two is more than 3
Test hole (1) footpath, hole again；
B, it is drilled with one group of boring (3) from auxiliary tunnel (2) to test hole (1), and at least four sound is installed sends out
Penetrating sensor (4), the layout of acoustic emission sensor (4) follows at least two Sensor monitoring sections of formation,
And each section arranges the principle of at least two acoustic emission sensor (4), the most each acoustic emission sensor (4)
Both pass through protolith district (5), and do not enter the area of stress concentration of country rock and country rock relaxes district；Each Sensor monitoring
Section is respectively positioned on the front of test hole (1) face, and is all higher than 3 to the distance testing hole (1) face
Test hole (1) footpath, hole again；
C, with given pace forward excavate test hole (1), until test hole (1) face be positioned at sensor
The front of monitoring section, and to the distance of each monitoring section more than test hole (1) footpath, hole of 3 times；
Each acoustic emission sensor (4) is to the test hole that distance is 0.5～1 times of test hole (1) excavation contour line
(1) footpath, hole.
The measuring method in on-the-spot country rock micro rupture region the most according to claim 1, it is characterised in that:
Described test hole (1) circular in cross-section, a diameter of 5-6m.
The measuring method in on-the-spot country rock micro rupture region the most according to claim 1 and 2, its feature exists
In: described auxiliary tunnel (2) cross section is the flat shape of a hoof, a size of 3m.
The measuring method in on-the-spot country rock micro rupture region the most according to claim 1 and 2, its feature exists
In: the distance between adjacent two sensors monitoring section is 2-3m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210446277.8A CN103808807B (en) | 2012-11-09 | 2012-11-09 | The measuring method in on-the-spot country rock micro rupture region |
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| CN201210446277.8A CN103808807B (en) | 2012-11-09 | 2012-11-09 | The measuring method in on-the-spot country rock micro rupture region |
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| CN103808807A CN103808807A (en) | 2014-05-21 |
| CN103808807B true CN103808807B (en) | 2016-10-05 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107588750A (en) * | 2017-07-10 | 2018-01-16 | 中铁二院工程集团有限责任公司 | A kind of method suitable for deep tunnel face country rock overall process deformation monitoring |
| CN108872391B (en) * | 2018-04-26 | 2021-02-19 | 长江地球物理探测（武汉）有限公司 | Geophysical prospecting analysis method for evaluating stable state of rock mass |
| CN114135315A (en) * | 2021-11-22 | 2022-03-04 | 中铁十六局集团第三工程有限公司 | Advanced stress release construction method for severe large-deformation tunnel |
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| CN101852704A (en) * | 2010-06-07 | 2010-10-06 | 中国水电顾问集团华东勘测设计研究院 | Method for measuring deep rock-sample initial damage distribution |
| CN101922985A (en) * | 2010-08-04 | 2010-12-22 | 中国水电顾问集团华东勘测设计研究院 | Measurement method for stress change of rocks during TBM tunneling |
| CN102141544A (en) * | 2010-12-02 | 2011-08-03 | 中国水电顾问集团华东勘测设计研究院 | Method for testing surrounding rock relaxation depth |
| CN102539652A (en) * | 2012-01-05 | 2012-07-04 | 浙江中科依泰斯卡岩石工程研发有限公司 | Method for monitoring response systematicness of excavation of adjacent rock of deep buried tunnel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58129251A (en) * | 1982-01-29 | 1983-08-02 | Hitachi Ltd | Nondestructive inspecting method of filled weld zone of small-diameter piping |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852704A (en) * | 2010-06-07 | 2010-10-06 | 中国水电顾问集团华东勘测设计研究院 | Method for measuring deep rock-sample initial damage distribution |
| CN101922985A (en) * | 2010-08-04 | 2010-12-22 | 中国水电顾问集团华东勘测设计研究院 | Measurement method for stress change of rocks during TBM tunneling |
| CN102141544A (en) * | 2010-12-02 | 2011-08-03 | 中国水电顾问集团华东勘测设计研究院 | Method for testing surrounding rock relaxation depth |
| CN102539652A (en) * | 2012-01-05 | 2012-07-04 | 浙江中科依泰斯卡岩石工程研发有限公司 | Method for monitoring response systematicness of excavation of adjacent rock of deep buried tunnel |
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