CN104597130A - Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine - Google Patents
Method for detecting and analyzing evolution process of structure of surrounding rock in area of deep tunnel of coal mine Download PDFInfo
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- CN104597130A CN104597130A CN201510059350.XA CN201510059350A CN104597130A CN 104597130 A CN104597130 A CN 104597130A CN 201510059350 A CN201510059350 A CN 201510059350A CN 104597130 A CN104597130 A CN 104597130A
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- 239000011435 rock Substances 0.000 title claims abstract description 124
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- 238000012360 testing method Methods 0.000 claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 13
- 238000002604 ultrasonography Methods 0.000 claims description 9
- 230000010429 evolutionary process Effects 0.000 claims description 8
- 238000011835 investigation Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 238000012098 association analyses Methods 0.000 claims description 4
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- 238000010586 diagram Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000007569 slipcasting Methods 0.000 description 2
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- 238000010835 comparative analysis Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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Abstract
The invention discloses a method for detecting and analyzing the evolution process of the structure of surrounding rock in the area of a deep tunnel of a coal mine. The method comprises the following steps: (1) distributing testing drill holes in a to-be-detected area of the surrounding rock of the deep tunnel of the coal mine, and installing and propelling digital drill hole picture taking probes in the drill holes in sequence to obtain the principle on evolution of the propagation characteristic of sound waves along with time in the drill holes of the surrounding rock, wherein the drill holes are arranged in parallel, and have the same depth as the to-be-detected area of the surrounding rock; (2) obtaining the spacial distribution of the volumetric joint count (Jv) of the surrounding rock in the area of the deep tunnel according to single hole structure surface information; (3) obtaining the spacial distribution of the integrity index (Kv) of the surrounding rock in the area of the deep tunnel and the evolution principle of the surrounding rock by taking the propagation of sound waves of adjacent drill holes in the area of the deep tunnel as a boundary condition; and (4) comparing the integrity index, the volumetric joint count (Jv), with the integrity index (Kv) of the surrounding rock comprehensively to obtain the evolution process of the structure of the surrounding rock in the area of the deep tunnel of the coal mine. The method disclosed by the invention is practical, is easy and convenient to operate and is used for obtaining the integrity and evolution principle of the structure of the surrounding rock before and after excavating the tunnel of the coal mine so as to provide scientific basis for the stable control and security evaluation of the surrounding rock of the deep tunnel of the coal mine.
Description
Technical field
The invention belongs to rock mass structure detection analysis technical field, relate to a kind of detection analysis method being applicable to deep tunnel region, colliery surrounding rock structure evolutionary process particularly.
Background technology
By the impact of geologic media and the activity of mankind's excavation, colliery deep laneway surrounding rock also exists a large amount of structural planes.These structural planes are usually the positions that coffer mechanics intensity is relatively weak, and it causes the uncontinuity of coffer mechanics character, inhomogeneity and anisotropy, and its space distribution and combined situation have vital impact to the dielectric attribute of country rock and mechanical attribute.Therefore, detection analysis surrounding rock structure grasp its evolutionary process colliery deep laneway surrounding rock stability contorting and safety evaluation are had great importance.
At present, the Main Means of surrounding rock structure detection is still drilling core determination method, and it is simple, convenient, directly perceived, practical.But due to high-ground stress and the weak broken feature of colliery deep wall rock, core is taked very difficult, causes drilling core determination method to be difficult to the development characteristics in reflect structure face.And the digital panoramic shooting system in hole structure face, the image information of bore inner can be obtained by borehole camera, provide high-resolution 360 ° of hole wall stretch-out views and three-dimensional histogram, so obtain that the occurrence in hole structure face, mark are long, the information such as gap length and filling material.But by the restriction of objective condition, testing bore holes is difficult to cover the Zone Full of country rock, often can only reflects the architectural feature of local country rock be difficult to the provincial characteristics of reflection surrounding rock structure by the make a video recording information that obtains of one borehole.In addition, the surrounding rock structure after roadway excavation is in fact dynamic change, and is difficult to grasp this change procedure by means of only borehole camera method.Therefore, need a kind of new detection analysis method badly to obtain the structure evolution process of deep tunnel region, colliery country rock, and this method domestic and foreign literature there is not been reported.
Summary of the invention
The object of the invention is to for colliery deep laneway surrounding rock stable control, the detection analysis method of a kind of region surrounding rock structure evolutionary process is provided, easy to implement the method, easy and simple to handle, obtain integrality and the Evolution thereof of surrounding rock structure before and after roadway excavation, thus provide scientific basis for colliery deep laneway surrounding rock stability contorting and safety evaluatio.
In order to realize above-mentioned object, the present invention adopts following technical measures:
Be applicable to a detection analysis method for deep tunnel region, colliery surrounding rock structure, the steps include:
(1) excavated in roadway surrounding rock region to be measured in deep, colliery and arranged testing bore holes (5,9,13, determine according to regional extent and measuring accuracy), boring lays respectively at zone boundary to be measured and regional center place, be parallel to each other between boring, hole depth and regional depth are consistent.For each boring, install successively in hole and push digital borehole camera probe (BHCTV), gather borehole image information.Afterwards, adjacent boring combination of two, installs ultrasound probe header (SR-RCT(B)), carry out across hole ultrasonic investigation, and by the repeated test in different time, obtain the propagation characteristic Evolution in time of sound wave country rock between hole.
(2) according to single hole arrangements surface information, carry out across hole association analysis, judge the similarity in adjacent hole structure face, extend or be communicated with hole structure face, the structural plane feature of country rock between acquisition pores.And then, by the statistical study to surrounding rock structure surface information between all drilled hole in region and hole, obtain the spatial distribution characteristic of the country rock volume joint number Jv of region surrounding rock structure.
(3) utilize the Acoustic Wave Propagation feature of adjacent boring in region as boundary condition, the propagation characteristic of inverting sound wave in the country rock of whole region, and then the Perfection Index of analyzed area country rock, obtain spatial distribution characteristic and the Evolution in time thereof of region rock integrity index Kv.
(4) Comprehensive Correlation rock integrity index country rock volume joint number Jv and region rock integrity index Kv, using the volume joint number Jv of region surrounding rock structure as the starting condition of rock integrity, the Evolution of region rock integrity index Kv, as the dynamic condition of rock integrity, obtains the evolutionary process of region surrounding rock structure integrality.
Owing to have employed above technical measures, good effect and the advantage of the detection analysis method of deep tunnel region, colliery of the present invention surrounding rock structure are:
1. based on single hole arrangements surface information, carry out the structural surface information across country rock between hole association analysis acquisition pores, and then obtain the statistical nature of region wall rock structure face by statistical study, thus achieve surrounding rock structure detection by the breakthrough detected in hole to regionally detecting;
2. adopt the repeated test carried out across hole supercritical ultrasonics technology in different time, obtain the Evolution of region, tunnel rock integrity, thus achieve surrounding rock structure detection by the breakthrough of static instrumentation to dynamic instrumentation;
3. arrange and boring assembled scheme owing to have employed porous, improve the efficiency of surrounding rock structure detection and the comprehensive of structural surface information extraction;
4. utilize two kinds of different measuring technologies mutually to verify and comparative analysis structural surface information, improve accuracy and the reliability of surrounding rock structure result of detection;
5. the method not only can be used for the structure detection of having excavated roadway surrounding rock, also can be used for closing on the forward probe not excavating roadway surrounding rock structure.
6. the method can improve surrounding rock structure investigative range and reaches more than 30 times.
Accompanying drawing explanation
Fig. 1 is region, a kind of tunnel Host Medium Selection schematic diagram.
Fig. 2 is that region, a kind of tunnel wall rock drill-hole arranges schematic diagram.
Fig. 3 is that schematic diagram is arranged in country rock five boring of region, a kind of tunnel.
Fig. 4 is borehole camera schematic diagram.
Fig. 5 is across hole ultrasonic investigation schematic diagram.
Fig. 6 is the tunnel test zone and borehole pattern determined in embodiment.
Fig. 7 is the borehole image obtained in embodiment.
Fig. 8 is that the velocity of wave that obtains in embodiment is with hole depth change curve.
Fig. 9 is the spatial distribution map of the wall rock structure face analyzing acquisition in embodiment.
Figure 10 is the region rock integrity isogram analyzing acquisition in embodiment.
Figure 11 is the region rock integrity isoline variation diagram in time analyzing acquisition in embodiment.
Figure 12 is rock integrity isogram in region before and after slip casting in embodiment.
Excavate tunnel 1-1, do not excavate tunnel 1-2, first area country rock 2-1, second area country rock 2-2, 3rd region country rock 2-3, first boring 3-1, second boring 3-2, 3rd boring 3-3, 4th boring 3-4, 5th boring 3-5, 6th boring 3-6, 7th boring 3-7, 8th boring 3-8, 9th boring 3-9, tenth boring 3-10, 11 boring 3-11, 12 boring 3-12, 13 boring 3-13, digital borehole camera probe 4(BHCTV), across hole ultrasound probe header 5-1(SR-RCT(B)), across hole ultrasound probe header 5-2(SR-RCT(B)).
Embodiment
embodiment 1:
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
According to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, a kind of detection analysis method being applicable to deep tunnel region, colliery surrounding rock structure, the steps include:
A, according to engineering demand, select region to be measured excavating tunnel 1-1 periphery, regional depth is 3 ~ 7 Bei Dong footpaths, and this region can for being positioned at first area country rock 2-1, the second area country rock 2-2 of roadway's sides and being positioned at the 3rd region country rock 2-3 of roadway floor.For closing on the forward probe not excavating roadway surrounding rock structure, as do not excavated tunnel 1-2, second area country rock 2-2 can be selected to be test zone excavating tunnel 1-1 periphery.
Testing bore holes is arranged respectively at bed boundaries place, region to be measured and center, holing minimum is 5, i.e. the first boring 3-1, second boring 3-2, 3rd boring 3-3, 4th boring 3-4, 5th boring 3-5, if regional extent to be measured is larger, the 6th boring 3-6 can be arranged further, 7th boring 3-7, 8th boring 3-8, 9th boring 3-9, if regional extent to be measured is comparatively large and higher to measuring accuracy requirement, the tenth boring 3-10 can be arranged further, 11 boring 3-11, 12 boring 3-12, 13 boring 3-13, borehole axial is mutually vertical with free face, region, angle can be readjusted by a small margin according to on-the-spot physical condition, but be no more than ± 5 °.All boring is parallel to each other, and hole depth and regional depth are consistent.
To test the five hole arrangements of second area country rock 2-2, at the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5, digital borehole camera probe 4 is installed successively, advance gradually along hole depth direction, obtain the image information of whole boring.After this test completes, in all boring, comprise the first boring 3-1, second boring 3-2, 3rd boring 3-3, 4th boring 3-4, 5th boring 3-5 mounting sleeve, (8 groups are comprised in adjacent boring, be respectively the first boring 3-1 and second boring 3-2 combination, second boring 3-2 and the 3rd boring 3-3 combination, 3rd boring 3-3 and the 4th boring 3-4 combination, 4th boring 3-4 and first boring 3-1 combination, first boring 3-1 and the 5th boring 3-5 combination, second boring 3-2 and the 5th boring 3-5 combination, 3rd boring 3-3 and the 5th boring 3-5 combination, 4th boring 3-4 and the 5th boring 3-5 combination, ) in bury underground across hole ultrasound probe header 5-1, across hole ultrasound probe header 5-2, synchronous slowly propelling, obtain the propagation characteristic of sound wave country rock between hole.In different time, repeat this test, obtain not the propagation characteristic of sound wave between the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5 in the same time.
B, analysis borehole image information, obtain that the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the occurrence of the 5th boring 3-5 structural plane, mark are long, gap length and stuff information, occurrence, the mark of more adjacent boring are long, the similarity degree of gap length, and judge that whether a certain structural plane of adjacent boring is similar in conjunction with filling material informix.If similar, then extend or be communicated with hole structure face, structural surface information between acquisition pores.And then, by the statistical study to structural surface information between all drilled hole in region and hole, obtain the spatial distribution characteristic of the country rock volume joint number Jv of region, tunnel surrounding rock structure.
C, the velocity of wave propagated between hole according to sound wave in different time and decay characteristics thereof, the region rock integrity index Kv rule over time of country rock between acquisition pores; Using the Perfection Index Kv of country rock between hole as boundary condition, the spatial distribution characteristic of back analysis region rock integrity index Kv and Evolution in time thereof.
D, Comprehensive Correlation rock integrity index country rock volume joint number Jv and region rock integrity index Kv, using the country rock volume joint number Jv of region country rock that obtained by the borehole camera starting condition as rock integrity, using the dynamic condition that the evolution Feature of the region rock integrity index Kv obtained across hole ultrasonic investigation develops as rock integrity, obtain deep tunnel region, colliery surrounding rock structure evolutionary process.
Embodiment 2:
This example detects certain deep tunnel region, colliery surrounding rock structure that buried depth is-850m.Test zone and boring are arranged as shown in Figure 6, and the footpath, hole that tunnel 1-1 has been excavated in test is 4.50 × 3.45m.Concrete grammar and step as follows:
A, selection have excavated the second area 2-2 of tunnel 1-1 as region to be measured, and area size is that 2 × 1 × 25m(is wide × high × dark), region lower limb is positioned at 0.5m above base plate.Owing to selecting search coverage less, so arrange five borings in zone boundary and center, be respectively the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5, boring aperture 130mm, downward-sloping 2 °, hole depth 25m.Install successively in the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5 and push digital borehole camera probe 4, gather borehole image information, as shown in Figure 7.Afterwards, install for the steel sleeve across hole ultrasonic investigation to foot of hole in the first boring 3-1, second holes 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5, steel sleeve sealed bottom, then slip casting makes the secretion between steel sleeve and boring country rock closely knit.(8 groups are comprised in adjacent boring, be respectively the first boring 3-1 and second boring 3-2 combination, second boring 3-2 and the 3rd boring 3-3 combination, 3rd boring 3-3 and the 4th boring 3-4 combination, 4th boring 3-4 and first boring 3-1 combination, first boring 3-1 and the 5th boring 3-5 combination, second boring 3-2 and the 5th boring 3-5 combination, 3rd boring 3-3 and the 5th boring 3-5 combination, 4th boring 3-4 and the 5th boring 3-5 combination, ) in bury underground across hole ultrasound probe header 5-1, across hole ultrasound probe header 5-2, synchronous slowly propelling, obtain velocity of propagation and the decay characteristics of sound wave country rock between hole, as shown in Figure 8.
B, based on the first boring 3-1, the second boring 3-2, the 3rd boring 3-3, the 4th boring 3-4, the 5th boring 3-5 structural surface information, carry out across hole association analysis, obtain the spatial distribution characteristic of the country rock volume joint number Jv of region, tunnel surrounding rock structure, as shown in Figure 9.Based on across hole ultrasound test result, obtain roadway surrounding rock Perfection Index spatial distribution characteristic and Evolution in time thereof as shown in Figure 10.
C, based on the country rock volume joint number Jv of region country rock and the evolution Feature of region rock integrity index Kv, obtain deep tunnel region, colliery surrounding rock structure evolutionary process as shown in figure 11.
According to region surrounding rock structure detection analysis result, after finding roadway excavation, near field rock integrity is comparatively poor, and progressively to depths expansion, rock integrity develops and do not enter steady state (SS).Meanwhile, surface displacement monitoring result also show identical result.Therefore to have carried out reinforcing Shallow hole grouting+deep hole grouting+high-strength prestressed anchor cable+multiple spray-up to test section be secondary supporting.Afterwards, test result shows, rock integrity improves 15% ~ 30%(as shown in figure 12), rock integrity develops and progressively enters steady state (SS).
Claims (1)
1. be applicable to a detection analysis method for deep tunnel region, colliery surrounding rock structure, the steps include:
(1) in colliery deep laneway surrounding rock region to be measured, testing bore holes is arranged, boring lays respectively at zone boundary to be measured and regional center place, be parallel to each other between boring, hole depth is consistent with regional depth, for each boring, install successively in hole and push digital borehole camera probe, gather borehole image information, afterwards, adjacent boring combination of two, installs ultrasound probe header, carries out across hole ultrasonic investigation, by the repeated test in different time, obtain the propagation characteristic Evolution in time of sound wave country rock between hole;
(2) according to single hole arrangements surface information, carry out across hole association analysis, judge the similarity in adjacent hole structure face, extend or be communicated with hole structure face, the structural plane feature of country rock between acquisition pores, by the statistical study to surrounding rock structure surface information between all drilled hole in region and hole, obtain the spatial distribution characteristic of the country rock volume joint number Jv of region, tunnel surrounding rock structure;
(3) Acoustic Wave Propagation of adjacent boring in region is utilized to be characterized as boundary condition, the propagation characteristic of inverting sound wave in the country rock of whole region, the Perfection Index of analyzed area country rock, obtains spatial distribution characteristic and the Evolution in time of region rock integrity index Kv;
(4) Comprehensive Correlation rock integrity index country rock volume joint number Jv and region rock integrity index Kv, using the volume joint number Jv of region surrounding rock structure as the starting condition of rock integrity, the Evolution of region rock integrity index Kv is the dynamic condition of rock integrity, obtains the evolutionary process of region surrounding rock structure integrality.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105759010A (en) * | 2016-02-04 | 2016-07-13 | 山东大学 | Mining influence tunnel dynamic monitoring and stability evaluation method |
| CN111999781A (en) * | 2020-09-14 | 2020-11-27 | 山东科技大学 | Deep well roadway omnibearing surrounding rock structure dynamic measurement analysis method |
| CN116299708A (en) * | 2023-02-02 | 2023-06-23 | 西南交通大学 | Visualization method and related equipment for tunnel surrounding rock loose ring evolution process |
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| CN116299708B (en) * | 2023-02-02 | 2024-05-07 | 西南交通大学 | Visualization method and related equipment for tunnel surrounding rock loose ring evolution process |
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