CN109655369B - Method for testing integrity and loosening ring of surrounding rock of engineering rock mass - Google Patents
Method for testing integrity and loosening ring of surrounding rock of engineering rock mass Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 118
- 238000012360 testing method Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005553 drilling Methods 0.000 claims abstract description 87
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005065 mining Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000004297 night vision Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 206010057175 Mass conditions Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
Abstract
A method for testing integrity and loosening ring of surrounding rock of engineering rock mass belongs to the technical field of safety detection and monitoring of mining and geotechnical engineering. Comprises an air bag testing device and the following steps: step 1001, drilling a hole; step 1002, placing an airbag testing device; step 1003, inflating the airbag (5); step 1004, inflating the closed section; step 1005, judging the integrity of the rock mass; step 1006, judging whether the current sealing section is tested completely; step 1007, judging whether the current drilling (11) is finished; step 1008, testing the next section in the borehole (11); at step 1009, additional drilling (11) tests are performed. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock mass has the advantages of simple operation, safety, reliability, environmental protection, economy, high accuracy, wide application range and the like.
Description
Technical Field
A method for testing integrity and loosening ring of surrounding rock of engineering rock mass belongs to the technical field of safety detection and monitoring of mining and geotechnical engineering.
Background
After the engineering rock mass is excavated, the stress of the surrounding rock is increased, if the concentrated stress in the surrounding rock exceeds the strength of the surrounding rock, the surrounding rock is damaged, a fractured zone, a plastic zone and an elastic zone are formed from an adjacent empty surface to the deep part of the rock mass, wherein the fractured zone is called a surrounding rock loosening ring, and the support of the broken surrounding rock is the key and difficult point of the safety and construction work of the engineering rock mass, so the test of the surrounding rock loosening ring is particularly important, and the determination of the surrounding rock loosening ring has important significance for selecting a reasonable support mode and parameters and the working surface advance support range.
The existing surrounding rock loosening ring test method mainly comprises a sound wave method, a multipoint displacement meter method, a geological radar method, a seismic wave method, a resistivity method, a penetration method and the like, the sound wave test method is mainly adopted at present, the method comprises a single-hole method and a double-hole method, and the method has the main problems that wind and water pipes are often provided in the test, the workload is large, water is adopted as a coupling medium of a sound wave probe and the wall of a rock hole, the requirements on the flow, the pressure and the water quality of the water are high, the actual operation is difficult, a tester is often wetted by the water on the whole body, the test result is inaccurate due to the influence of the coupling medium in the test process, and the wave speed in many cases is difficult to determine.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for testing the integrity of the surrounding rock and the loosening ring of the engineering rock mass overcomes the defects of the prior art, forms a closed section in a drilling hole, fills gas into the closed section, judges the integrity of the rock mass in the closed section through the inflation volume after the sealed section is inflated to the preset air pressure, and has the advantages of simple operation, safety, reliability, environmental protection, economy, high accuracy, wide application range and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method is characterized in that: the air bag testing device comprises two air bags arranged at intervals, an air bag inflation tube for inflating the air bags is arranged in each air bag, the air bags are tightly attached to the inner wall of a drilled hole after being inflated, the two air bags form a closed section in the drilled hole at intervals, the drilling inflation tube for inflating the closed section is further arranged, and the testing method comprises the following steps:
and step 1009, after the current drilling test is finished, obtaining the integral integrity data in the current drilling, and then taking the air bag testing device out of the drilling to test other drilling.
Preferably, the two airbags are connected and communicated through an airbag inflation tube and a drilling inflation tube, the airbag inflation tube and the drilling inflation tube are connected to the end portion of any airbag at the same time, extend to the outside of a drill hole and are connected with an air source, and a drilling air outlet hole is formed in the surface of the drilling inflation tube connected with the two airbags.
Preferably, a group of inner tubes are arranged in the air bag, and two ends of each inner tube are respectively butted with connecting end heads arranged at two ends of the air bag;
the two inner pipes are respectively corresponding to an air bag inflation pipe and a drilling inflation pipe outside the air bag, and the air bag inflation pipe and the drilling inflation pipe are butted with the corresponding inner pipes in the air bag through connecting end heads; an air bag air outlet is arranged on the surface of the inner tube corresponding to the air bag inflation tube.
Preferably, a section of the air bag inflation tube, which is positioned outside the drill hole, is connected with an air bag inflation tube valve and an air bag inflation tube pressure gauge; and a section of the drilling gas-filled pipe positioned outside the drilling hole is connected with a drilling gas-filled pipe valve, a flowmeter and a drilling gas-filled pipe pressure gauge.
Preferably, the air bag inflation tube and the drilling inflation tube are in butt joint in multiple sections, and scales are arranged on the surfaces of the air bag inflation tube and/or the drilling inflation tube.
Preferably, the process for determining the integrity of the rock mass in step 1005 includes the following steps:
step 1005-1, determining the volume of the closed section with the same length under the complete rock mass to reach the preset pressureV 0 ；
Step 1005-2, determining the volume required by the current sealed section in the drill hole to reach the preset pressureV p ；
Step 1005-3, obtaining parameters of rock integrity according to the volume parametersK 1 ，K 1 = V 0 /V p ；
Step 1005-4, recording the surrounding rocks of the current closed section;
step 1005-5, determining the surface area of the current closed sectionS o ；
Step 1005-6, determining the surface area of the fracture zone in the current containment sectionS p ；
Step 1005-7, obtaining parameters of rock integrity according to the area parametersK 2 ，K 2 =（S o - S p ）/S o ；
Step 1005-8, obtaining parameters of rock integrityK，K=（K 1 + K 2 ）/2；
Step 1005-9, according to the parametersKThe value of (a) defines the integrity of the rock mass.
Preferably, in the step 1005-9, the rock integrity definition criterion is:
when in useKWhen the pressure is more than 0.75, defining the integrity of the current closed section as an integral rock mass;
when 0.55 <KWhen the total mass is less than 0.75, defining the integrity of the current closed section as a relatively complete rock mass;
when 0.35 <KWhen the total weight is less than 0.55, defining the integrity of the current closed section as a relatively broken rock mass;
when 0.15 <KWhen the total volume is less than 0.35, defining the integrity of the current closed section as a fractured rock mass;
when in useKBelow 0.15, the integrity of the current confined section is defined as extremely fractured rock mass.
Preferably, the diameter of the drilled hole is larger than 42mm, and the hole depth of the drilled hole is larger than 2 m.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the method for testing the integrity of the surrounding rock and the loosening ring of the engineering rock, the sealed section is formed in the drill hole, the gas is filled into the sealed section, and the integrity of the rock in the sealed section is judged through the inflation volume after the sealed section is inflated to the preset air pressure.
2. The invention has simple operation and analysis: utilize inflater or air pump to inflate to two gasbags through the gas tube, seal the gas between two gasbags, then inflate in the drilling between two gasbags, according to the reading of gas compressor table and gas flowmeter and complete rock mass condition relative ratio, judge rock mass integrality degree, it is big more to reach the required volume of equal atmospheric pressure, then its integrality is worse, vice versa, the taking a photograph of the wireless miniature camera head of high definition night vision is recorded process and analysis also very simple.
3. The invention has high automation degree: the integrity degree of the surrounding rock is determined according to the readings of the gas meter and the gas flowmeter, the automation degree is high, and manpower and material resources are saved.
4. The invention is safe, reliable, economic and environment-friendly: the invention utilizes the inflator or the air pump to inflate the two air bags and the drill hole between the two air bags through the inflation tube, has low inflation pressure, is safe and reliable, utilizes the air as a medium for testing the integrity of the surrounding rock, is inexhaustible, does not pollute the environment, does not need to purchase expensive testing equipment, and is very economic and environment-friendly.
5. The invention has high accuracy: according to the method, the pressure and the volume of the gas are used as judgment bases, test data are easy to obtain, the larger the volume required by the same gas pressure or the smaller the gas pressure of the same gas volume is, the worse the integrity of the surrounding rock is, the analysis process is simple, the integrity of the surrounding rock is determined by comprehensive comparison and analysis with the condition of the drilling surrounding rock recorded by the high-definition night-vision wireless micro camera, and the accuracy is high.
6. The invention has wide application range: the invention is suitable for testing the loosening ring of the surrounding rock of the engineering rock mass in the fields of hydraulic and hydroelectric engineering, traffic, mines and the like, and is suitable for any region of the surrounding rock.
7. The air bag inflation tube and the drilling inflation tube can adopt a plurality of butt joint sections, so that the tube length can be conveniently adjusted according to the drilling depth.
Drawings
FIG. 1 is a flow chart of a method for testing integrity and loosening ring of surrounding rock of an engineering rock body.
FIG. 2 is a schematic structural diagram of an air bag testing device for a method for testing integrity and loosening ring of surrounding rock of an engineering rock body.
Wherein: 1. the device comprises an air bag inflation pipe valve 2, an air bag inflation pipe pressure gauge 3, an engineering rock body 4, a connecting end 5, an air bag 6, an air bag air outlet 7, a camera 8, an air bag inflation pipe 9, a drilling inflation pipe 10, a drilling air outlet 11, a drilling hole 12, a drilling inflation pipe pressure gauge 13, a flowmeter 14 and a drilling inflation pipe valve.
Detailed Description
FIGS. 1-2 illustrate preferred embodiments of the present invention, and the present invention will be further described with reference to FIGS. 1-2.
As shown in figure 1, the method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body comprises the following steps:
and (3) constructing the surrounding rock of the engineering rock body 3 by using a pore-forming drilling machine, forming a drill hole 11 for forming test, and cleaning the hole after the drill hole 11 is formed. The diameter of the bore hole 11 is larger than 42mm and the hole depth of the bore hole 11 is larger than 2 m.
the balloon test apparatus is placed into the borehole 11 and the inner end of the balloon test apparatus is first placed at the end of the borehole 11.
As shown in fig. 2, the air bag testing device comprises two air bags 5 which are arranged at intervals, and the two air bags 5 are connected by an air bag inflation tube 8 and a drilling inflation tube 9. Openings are formed in two ends of the air bag 5, connecting end heads 4 are arranged at the openings in the two ends of each air bag 5 respectively, a group of inner tubes are arranged in the air bags 5, and the inner tubes are connected with the connecting end heads 4 at the two ends and support the air bags 5. The inner tube of the air bag 5 comprises two tubes, one of which corresponds to the air bag inflation tube 8 and the other of which corresponds to the drilling inflation tube 9. The air bag inflation tube 8 and the drilling inflation tube 9 are connected with the connecting end 4 at the end part of the air bag 5 in a conventional connecting mode (such as threads), and after the connection is finished, the air bag inflation tube 8 and the drilling inflation tube 9 are respectively butted with corresponding inner tubes in the air bag 5.
The two air bags 5 are assembled in a movable connection mode through the air bag inflation tube 8 and the drilling inflation tube 9, so that the proper distance between the two air bags 5 can be selected according to actual test conditions, and meanwhile, the collection of all components after the test is facilitated. The preferred spacing between the two bladders 5 is 0.2 m. And a camera 7 is further fixed on the air bag inflation tube 8 or the drilling inflation tube 9 between the two air bags 5, and the camera 7 is realized by adopting a high-definition night vision wireless micro camera.
Of the two inner tubes in the air bag 5, one inner tube corresponding to the air bag inflation tube 8 is provided with at least one air bag air outlet hole 6, and the air bag 5 is conveniently inflated through the air bag air outlet hole 6. A drilling air outlet 10 is formed in the drilling air charging pipe 9, and the drilling air outlet 10 is positioned on the drilling air charging pipe 9 between the two air bags 5 so as to conveniently inflate a drilling section between the two air bags 5.
After the two airbags 5 are connected through the airbag inflation tube 8 and the drilling inflation tube 9, the connecting end 4 at the end of one airbag 5 is plugged by a plug, the connecting end 4 at the end of the other airbag 5 is connected with the airbag inflation tube 8 and the drilling inflation tube 9 again respectively, and the airbag inflation tube 8 and the drilling inflation tube 9 (whole or multiple butt joints) with proper lengths are connected according to the depth of the drilling hole 11, so that the airbag inflation tube 8 and the drilling inflation tube 9 can extend out from the opening of the drilling hole 11 when the airbags 5 are sent to the end of the drilling hole 11. The air bag inflation tube 8 and the drilling inflation tube 9 extend out of the opening of the drilling hole 11 and then are connected with an external inflator pump or an air source.
Scales are arranged on the surfaces of the air bag inflation tube 8 and the drilling inflation tube 9 so as to measure the depth of the air bag fed into the drilling hole 11; the section of the air bag inflation tube 8, which is positioned outside the drill hole 11, is connected with an air bag inflation tube valve 1 and an air bag inflation tube pressure gauge 2; a borehole inflation tube valve 14, a flow meter 13 and a borehole inflation tube pressure gauge 12 are connected to the section of the borehole inflation tube 9 located outside the borehole 11.
the valve 1 of the air bag inflation pipe is opened to inflate the air bag inflation pipe 8, the air rushed in through the air bag inflation pipe 8 enters the air bag 5 through the air bag air outlet 6 arranged in the air bag 5 respectively to enable the air bag 5 to be inflated, the air bag 5 is tightly attached to the inner wall of the drill hole 11 after being inflated, and therefore a closed section in the drill hole 11 is formed between the two air bags 5 at intervals, and the closed section is the current test section.
In order to ensure that the air bag 5 is tightly attached to the inner wall of the drill hole 11 to achieve a sealing effect, the valve 1 of the air bag inflation tube is closed when the reading of the pressure gauge 2 of the air bag inflation tube is 0.2MPa, and the air bag 5 is stopped from being inflated.
and (3) opening a drilling inflation tube valve 14 to inflate the drilling inflation tube 9, and enabling the gas entering from the drilling inflation tube 9 to flow out from a drilling air outlet 10 and enter a closed section between the two air bags 5.
in the method for testing the integrity and the loosening ring of the surrounding rock of the engineering rock mass, the basis for judging the integrity of the rock mass in the current closed section is as follows: on the premise that the length and the diameter of the closed section are the same, comparing the volume of the complete rock body reaching the preset pressure with the volume value of the current closed section reaching the preset pressure to obtain the integrity of the rock body of the current closed section, and the method specifically comprises the following steps:
step 1005-1, determining the volume of the closed section with the same length under the complete rock mass to reach the preset pressureV 0 ；
Step 1005-2, determining the volume required for the currently sealed section in the borehole 11 to reach the predetermined pressure based on the reading of the flow meter 13V p ；
Step 1005-3, obtaining parameters of rock integrity according to the volume parametersK 1 ，K 1 = V 0 /V p ；
Step 1005-4, starting the camera 7, and shooting and recording the surrounding rocks of the current closed section;
step 1005-5, determining the surface area of the current closed sectionS o ；
Step 1005-6, determining the surface area of the fracture zone in the current containment sectionS p ；
Step 1005-7, obtaining parameters of rock integrity according to the area parametersK 2 ，K 2 =（S o - S p ）/S o ；
Step 1005-8, obtaining parameters of rock integrityK，K=（K 1 + K 2 ）/2；
Step 1005-9, obtaining the integrity condition of the rock mass of the current airtight section according to the following criteria:
when in useKWhen the pressure is more than 0.75, defining the integrity of the current closed section as an integral rock mass;
when 0.55 <KWhen the total mass is less than 0.75, defining the integrity of the current closed section as a relatively complete rock mass;
when 0.35 <KWhen the total weight is less than 0.55, defining the integrity of the current closed section as a relatively broken rock mass;
when 0.15 <KWhen the total volume is less than 0.35, defining the integrity of the current closed section as a fractured rock mass;
when in useKBelow 0.15, the integrity of the current confined section is defined as extremely fractured rock mass.
judging whether the current closed section is tested completely, if so, executing the step 1007, and if not, returning to the step 1005;
judging whether the test of the drilling hole 11 in which the current closed section is located is finished, if the test is finished, executing a step 1009, and if the detection of the drilling hole 11 is not finished, executing a step 1008;
and opening the air bag inflation pipe valve 1, exhausting the air in the two air bags 5, moving the air bag testing device outwards towards the opening of the borehole 11, and returning to the step 1003 to test the next section in the borehole 11. The distance of outward movement of the air bag testing device is the distance between the two air bags 5 at present, and the distance of outward movement is determined by scales arranged on the surfaces of the air bag inflation tube 8 or the drilling inflation tube 9.
After the integrity test of the whole drill hole 11 is completed, integrity data of the drill hole 11 in different depth ranges are obtained, and the range of the surrounding rock loosening circle of the drill hole area is determined according to the integrity change rule from the hole opening to the hole bottom.
and after the current drilling hole 11 is tested, obtaining the integral integrity data in the current drilling hole 11, then opening the air bag inflation tube valve 1, exhausting the gas in the two air bags 5, taking the air bag testing device out of the drilling hole 11, and testing other drilling holes 11.
And (3) taking the air bag testing device out of the tested drill hole 11, putting the air bag testing device into other drill holes 11, completing the integrity and loosening circle data of the surrounding rocks of the other drill holes according to the steps 1001-1008, and finally obtaining the integrity and loosening circle data of the surrounding rocks of the whole engineering rock body 3.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. A method for testing integrity and loosening ring of surrounding rock of engineering rock mass is characterized by comprising the following steps: including gasbag testing arrangement, gasbag testing arrangement is provided with inflatable gasbag gas tube (8) in to gasbag (5) including two gasbag (5) that the interval set up, and gasbag (5) aerify back and the inner wall of drilling (11) closely laminate and interval formation airtight district section in drilling (11), still are provided with inflatable drilling gas tube (9) in the airtight district section, and the test method includes following steps:
step 1001, constructing a surrounding rock test part of the engineering rock body (3) by using a hole forming drilling machine, forming a drill hole (11) for forming test, and cleaning the hole after the drill hole (11) is formed;
step 1002, placing an air bag testing device into a drill hole (11), and firstly placing the inner end of the air bag testing device at the end of the drill hole (11);
step 1003, inflating the air bag inflation tube (8), and forming a sealed section for testing in the drill hole (11) after the air bag (5) is expanded;
step 1004, inflating the sealed section in the borehole (11) to a preset air pressure and recording the air flow required for inflating the sealed section to the preset air pressure;
step 1005, determining the integrity of the rock mass in the current closed section in the drill hole (11) through a rock mass integrity judgment process;
step 1006, judging whether the current sealing section is tested completely, if so, executing step 1007, and if not, returning to step 1005;
step 1007, judging whether the test of the drilling hole (11) where the current sealing section is located is finished, if so, executing step 1009, and if not, executing step 1008;
step 1008, moving the air bag testing device outwards towards the opening of the drill hole (11), returning to step 1003, and testing the next section in the drill hole (11);
step 1009, after the test of the current drill hole (11) is finished, obtaining the integral integrity data in the current drill hole (11), and then taking out the air bag test device from the drill hole (11) to test other drill holes (11);
the rock integrity judging process in the step 1005 comprises the following steps:
step 1005-1, determining the flow rate required by the same length of the closed section under the complete rock mass to reach the preset pressureV 0 ；
Step 1005-2, determining the flow rate required by the current closed section in the drilling hole (11) to reach the preset pressureV p ；
Step 1005-3, obtaining parameters of rock integrity according to the flow parametersK 1 ，K 1 = V 0 /V p ；
Step 1005-4, recording the surrounding rocks of the current closed section;
step 1005-5, determining the surface area of the current closed sectionS o ；
Step 1005-6, determining the surface area of the fracture zone in the current containment sectionS p ；
Step 1005-7, obtaining parameters of rock integrity according to the area parametersK 2 ，K 2 =（S o - S p ）/S o ；
Step 1005-8, obtaining parameters of rock integrityK，K=（K 1 + K 2 ）/2；
Step 1005-9, according to the parametersKThe value of (A) defines the integrity of the rock mass;
in the step 1005-9, the rock integrity definition criterion is:
when in useKWhen the pressure is more than 0.75, defining the integrity of the current closed section as an integral rock mass;
when 0.55 <KWhen the total mass is less than 0.75, defining the integrity of the current closed section as a relatively complete rock mass;
when 0.35 <KWhen less than 0.55, will beThe integrity of the front sealed section is defined as a relatively broken rock mass;
when 0.15 <KWhen the total volume is less than 0.35, defining the integrity of the current closed section as a fractured rock mass;
when in useKBelow 0.15, the integrity of the current confined section is defined as extremely fractured rock mass.
2. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body according to claim 1, which is characterized in that: two gasbag (5) between connect and communicate by gasbag gas tube (8) and drilling gas tube (9), gasbag gas tube (8) and drilling gas tube (9) are connected simultaneously at the tip of arbitrary gasbag (5) and are extended to drilling (11) outside to be connected with the air supply, be provided with drilling venthole (10) on drilling gas tube (9) surface of connecting two gasbag (5).
3. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body according to claim 1, which is characterized in that: a group of inner tubes are arranged in the air bag (5), and two ends of each inner tube are respectively butted with connecting end heads (4) arranged at two ends of the air bag (5);
the two inner pipes are respectively corresponding to an air bag inflation pipe (8) and a drilling inflation pipe (9) outside the air bag (5), and the air bag inflation pipe (8) and the drilling inflation pipe (9) are butted with the corresponding inner pipes in the air bag (5) through the connecting end (4); an air bag vent hole (6) is arranged on the surface of the inner tube corresponding to the air bag inflation tube (8).
4. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body according to claim 2, which is characterized in that: the section of the air bag inflation tube (8) positioned outside the drill hole (11) is connected with an air bag inflation tube valve (1) and an air bag inflation tube pressure gauge (2); and a section of the drilling gas-filled pipe (9) positioned outside the drilling hole (11) is connected with a drilling gas-filled pipe valve (14), a flowmeter (13) and a drilling gas-filled pipe pressure gauge (12).
5. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body according to claim 2, which is characterized in that: the air bag inflation tube (8) and the drilling inflation tube (9) are in butt joint in multiple sections, and scales are arranged on the surfaces of the air bag inflation tube (8) or/and the drilling inflation tube (9).
6. The method for testing the integrity and loosening ring of the surrounding rock of the engineering rock body according to claim 1, which is characterized in that: the diameter of the drill hole (11) is larger than 42mm, and the hole depth of the drill hole (11) is larger than 2 m.
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| CN109655369A (en) | 2019-04-19 |
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