CN204101748U - Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis - Google Patents

Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis Download PDF

Info

Publication number
CN204101748U
CN204101748U CN201420594273.9U CN201420594273U CN204101748U CN 204101748 U CN204101748 U CN 204101748U CN 201420594273 U CN201420594273 U CN 201420594273U CN 204101748 U CN204101748 U CN 204101748U
Authority
CN
China
Prior art keywords
hole
vibroseis
piston
ram hammer
self compensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201420594273.9U
Other languages
Chinese (zh)
Inventor
王桂峰
窦林名
巩思园
曹安业
贺虎
何江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Mining and Technology CUMT
Original Assignee
China University of Mining and Technology CUMT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Mining and Technology CUMT filed Critical China University of Mining and Technology CUMT
Priority to CN201420594273.9U priority Critical patent/CN204101748U/en
Application granted granted Critical
Publication of CN204101748U publication Critical patent/CN204101748U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Geophysics And Detection Of Objects (AREA)

Abstract

The utility model discloses a kind of combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis, it is characterized in that it is made up of strainer, self compensation mechanism, beater mechanism, connecting line in hole.It is by a row hole drilling of constructing at down-hole coal bed roadway workface lateral wall.In each boring, vibroseis is installed.In hole, strainer expands locking in the borehole by swelling bag.By regulating the parameter of ram hammer, seismic wave energy, frequency size that adjustable vibroseis produces.Automatically ram hammer can be moved to new working position by self compensation mechanism, piston at the bottom of hole is pushed against at the bottom of hole, and make ram hammer tup keep with piston at the bottom of hole all the time needed for impact distance.By swelling bag is carried out off-load, strainer, self compensation mechanism in recovery holes, reclaim ram hammer by wire rope one by one.The utility model can steady in a long-term, repeatedly export impulsive force, realize robotization and the normalization of impulsion pressure dynamic disaster prediction.

Description

Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis
Technical field
The utility model relates to a kind of seismic tomography prospecting technology, especially a kind of CT Detection Techniques of vibroseis, specifically a kind of combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis.
Background technology
Along with China's pit mining enters deep, impulsion pressure disaster has become one of major casualty threatening Safety of Coal Mine Production.Impulsion pressure is that the energy assembled in underground coal mine digging spatial peripheral coal and rock discharges suddenly in a large number, rapid damage coal and rock, and the coal or rock dynamic phenomenon producing strenuous vibration and distortion.The digging space that one-shot can cause tens of rice even to go up kilometer range is destroyed suddenly, causes serious personal's injures and deaths and device damage.
Impulsion pressure is that the elasticity be gathered in coal and rock can discharge suddenly the roadway dynamic disaster caused in a large number, and it is heavily stressed directly related that its formation and coal and rock are assembled.Earthquake CT is a kind of new method of exploration of engineering geophysics, also seismic event chromatography imaging method is claimed, when penetrating walking of geologic body by seismic ray and the observation of Wave energy change, computer disposal inverting obtains the inner wave speed of the earthquake of geologic body or seismic wave attenuation index profile picture, the region that reflection workplace seismic wave velocity directly perceived is high or abnormal, by corresponding relation good between velocity of wave and stress, the change of search coverage stress can be disclosed, transfer case, disclose rock burst hazardous location and grade thereof, for the forecast of impulsion pressure hazard prediction, erosion control measure validity check etc. provides important reference.
In recent years, this technology is increasingly extensive in the application in field, colliery, holed by arranged in arrays in the return airway (transportation roadway) of coal seam coal face, carry out one by one blowing out producing Artificial Seismic Wave focus, the wave detector of opposite side transportation roadway (return airway) arranged in arrays some, application shows, seismic CT detection can disclose search coverage rock burst hazardous location, disclose the change of workplace stress, transfer case, this mode potential safety hazard is many, quantities is large, and efficiency is low, needs the manpower and materials of at substantial; Force of explosion is difficult to accurately control and repeat to produce simultaneously, and deviation effects accuracy easily appears in test parameter.These factors cause before working face extraction, carrying out pre assessment based on general of the workplace shock hazard detection of earthquake CT through-transmission technique.And along with the back production of workplace, workplace stress constantly changes and shifts, only before back production, carry out pre assessment, impulsion pressure dynamic disaster demand that is dynamic, prediction in time can not be met far away, robotization and the normalization of dynamic disaster prediction can not be realized, maximize the potential playing down-hole coal bed workplace shock hazard seismic tomography prospecting technology, improve the work efficiency of prediction and control.
The key solved the problem develops one to arrange along coal seam tendency with arbitrarily angled boring in down-hole coal bed roadway workface; Can be locked in boring, earthquake controllable earthquake focus system steady in a long-term, repeatedly to export impulsive force.And the seismic wave energy of focus generation, frequency size are all adjustable, focal volume is little, safe and reliable, simple to operate, recyclable simultaneously, automaticity is high.
Summary of the invention
The purpose of this utility model is in working face of coal seam shock hazard seismic tomography prospecting technology under existing well, use explosive source potential safety hazard many, efficiency is low, quantities is large, be difficult to meet impulsion pressure dynamic disaster dynamic, the demand of timely prediction, be difficult to the robotization and the normalization that realize dynamic disaster prediction, be difficult to effectively, check erosion control measure effect in time, be difficult to play the problems such as the ability that this technological guidance's safety practice formulates, and provide a kind of volume little, safe and reliable, simple to operate, automaticity is high, can be partially recycled to reduce costs, can arrange along coal seam tendency with arbitrarily angled boring in down-hole coal bed roadway workface, can be locked in boring, seismic tomography prospecting fluid pressure type self compensation vibroseis in combined type impulsion pressure hazardous location steady in a long-term, repeatedly to export impulsive force.
The technical solution of the utility model is:
A kind of combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis, is characterized in that it comprises:
Strainer in one hole, in this hole, strainer is used for vibroseis to be locked in the focus hole of boring in tunnel, prevents vibroseis from skidding off outside focus hole because impacting retroaction; In this hole, strainer forms primarily of swelling bag 1, hollow tube 2 and terminal pad 5, and swelling bag 1 is sleeved on hollow tube 2, and one end of terminal pad 5 is inserted in the insertion end of hollow tube 2;
One fluid pressure type self compensation mechanism, ram hammer 12 can be moved to new working position by this self compensation mechanism automatically so that for ram hammer 12 again piston 17 at the bottom of hammering hole required impact distance is provided;
One beater mechanism, this beater mechanism energy hammering foot of hole produces the vibrations for detecting;
One sleeve 4, this sleeve 4 is for linking into an integrated entity strainer, fluid pressure type self compensation mechanism and beater mechanism in hole and providing installing space for self compensation mechanism and beater mechanism.
One connecting line, for providing the power source needed for vibroseis and compensating power source.
Described swelling bag 1 is pneumatic type or fluid pressure type (comprising hydraulic type and hydraulic type) swelling bag.
Described fluid pressure type self compensation mechanism comprises rear flange 7, piston cylinder 8, piston 9, spacer bar 10, described piston cylinder 8 is hydraulic type or hydraulic type piston cylinder, its front end is connected with rear flange 7, one end of piston 9 is arranged in piston cylinder 8, the other end stretches out piston cylinder 8 and offsets with one end of spacer bar 10, and the ram hammer 12 in the other end of spacer bar 10 and beater mechanism offsets to realize real-Time Compensation; Rear flange 7 is connected with the terminal pad 5 in strainer in hole by connecting link 6, thus realizes the connection of strainer and fluid pressure type self compensation mechanism in hole.
Described beater mechanism comprises piston 17 at the bottom of hanger 11, ram hammer 12, rubber ring group 13, tup 14, spacer bar 15, rubber ring group 16 and hole; Described ram hammer 12 is pneumatic type, hydraulic type, fluid pressure type and electromagnetic type; Being sleeved on ram hammer 12 rubber ring group 13 makes piston 17 at the bottom of ram hammer 12 and hole coordinate with sleeve 4 with the rubber ring group 16 be sleeved on piston 17 at the bottom of hole; Tup 14 is connected with the impact bar of ram hammer 12, and spacer bar 15 is arranged at the bottom of ram hammer 12 and hole between piston 17, and hanger 11 is connected with ram hammer 12 and is connected with one end and stretches out connecting band 22 outside sleeve 4.
In described hole, strainer is coordinated by step element 3 and sleeve 4.
Be provided with in described hollow tube 2 and provide the first connecting pipe 20 of power and the second connecting pipe 21, second connecting pipe 21 to be connected with accumulator 18 to piston cylinder, swelling bag 1 is connected with power source by the 3rd connecting pipe 19.
The beneficial effect of this practicality:
The utility model can realize robotization and the normalization of danger of burst prediction, maximizes the potential playing down-hole coal bed workplace shock hazard seismic tomography prospecting technology, improves the work efficiency of prediction and control.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of combined type seismic tomography prospecting self compensation vibroseis.
Fig. 2 is the schematic diagram of combined type seismic tomography prospecting self compensation vibroseis connecting line.
In figure: 1 is swelling bag, 2 is hollow tubes, and 3 is step element, and 4 is sleeves, 5 is terminal pads, and 6 is connecting links, and 7 is rear flanges, and 8 is piston cylinders, 9 is pistons, and 10 is spacer bars, and 11 is hangers, and 12 is ram hammers, 13 is rubber ring groups, and 14 is tups, and 15 is spacer bars, and 16 is rubber ring groups, 17 is pistons at the bottom of hole, and 18 is accumulators, and 19 is the 3rd connecting pipes, 20 is first connecting pipes, and 21 is second connecting pipes, and 22 is wire rope.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
As shown in Figure 1-2.
A kind of combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis, it comprises:
Strainer in one hole, in this hole, strainer is used for vibroseis to be locked in the focus hole of boring in tunnel, prevents vibroseis from skidding off outside focus hole because impacting retroaction; In this hole, strainer forms primarily of swelling bag 1, hollow tube 2 and terminal pad 5, and swelling bag 1 is sleeved on hollow tube 2, and one end of terminal pad 5 is inserted in the insertion end of hollow tube 2; In described hole, strainer is coordinated by step element 3 and sleeve 4.Be provided with in described hollow tube 2 and provide the first connecting pipe 20 of power and the second connecting pipe 21, second connecting pipe 21 to be connected with accumulator 18 to piston cylinder, swelling bag 1 is connected with power source by the 3rd connecting pipe 19.Described swelling bag 1 is pneumatic type, hydraulic type or hydraulic type swelling bag.
One fluid pressure type self compensation mechanism, ram hammer 12 can be moved to new working position by this self compensation mechanism automatically so that for ram hammer 12 again piston 17 at the bottom of hammering hole required impact distance is provided; Described fluid pressure type self compensation mechanism comprises rear flange 7, piston cylinder 8, piston 9, spacer bar 10, described piston cylinder 8 is hydraulic type or hydraulic type piston cylinder, its front end is connected with rear flange 7, one end of piston 9 is arranged in piston cylinder 8, the other end stretches out piston cylinder 8 and offsets with one end of spacer bar 10, and the ram hammer 12 in the other end of spacer bar 10 and beater mechanism offsets to realize real-Time Compensation; Rear flange 7 is connected with the terminal pad 5 in strainer in hole by connecting link 6, thus realizes the connection of strainer and fluid pressure type self compensation mechanism in hole.
One beater mechanism, this beater mechanism energy hammering foot of hole produces the vibrations for detecting; Described beater mechanism comprises piston 17 at the bottom of hanger 11, ram hammer 12, rubber ring group 13, tup 14, spacer bar 15, rubber ring group 16 and hole; Described ram hammer 12 is pneumatic type, hydraulic type, fluid pressure type and electromagnetic type; Being sleeved on ram hammer 12 rubber ring group 13 makes piston 17 at the bottom of ram hammer 12 and hole coordinate with sleeve 4 with the rubber ring group 16 be sleeved on piston 17 at the bottom of hole; Tup 14 is connected with the impact bar of ram hammer 12, and spacer bar 15 is arranged at the bottom of ram hammer 12 and hole between piston 17, and hanger 11 is connected with ram hammer 12 and is connected with one end and stretches out connecting band 22 outside sleeve 4.
One sleeve 4, this sleeve 4 is for linking into an integrated entity strainer, fluid pressure type self compensation mechanism and beater mechanism in hole and providing installing space for self compensation mechanism and beater mechanism.
One connecting line, for providing the power source needed for vibroseis and compensating power source.Connecting line comprises accumulator 18, the 3rd connecting pipe 19, first connecting pipe 20, second connecting pipe 21 and wire rope 22.3rd connecting pipe 19 is connected with swelling bag 1, first connecting pipe 20 is connected with ram hammer 12 through hollow tube 2, rear flange 7, piston 9, second connecting pipe 21 is connected with piston cylinder 8 through hollow tube 2, and wire rope 22 is connected with hanger 11 through hollow tube 2, rear flange 7, piston 9.
Using method of the present utility model is:
First, at the other processing in down-hole coal bed roadway workface side one row hole drilling; In each boring, a vibroseis be installed and locked in boring by strainer in the hole in vibroseis;
Secondly, inject power source to connecting pipe 19, swelling bag 1 is tensioner in boring, by vibroseis locking in the borehole;
3rd, inject power source to connecting pipe 20, start ram hammer, piston 17 at the bottom of tup 14 punching hole, at the bottom of hole, piston impact foot of hole, produces seismic event;
4th, foot of hole is compressed, tup 14 increases with the spacing of piston 17 at the bottom of hole, accumulator 18 passes through connecting pipe 21 to piston cylinder 8 injecting compensating power source, piston 9 stretches out and drives spacer bar 10 to hold out against ram hammer 12, ram hammer 12 holds out against piston 17 at the bottom of hole by spacer bar 15, makes tup 14 again keep required impact distance with piston 17 at the bottom of hole.
5th, repeat the content of the 3rd to the 4th step, focus can be made to repeat to export impulsive force;
6th, carry out off-load by connecting pipe 19 pairs of swelling bags 1, swelling bag 1 is retracted, and is extracted out by strainer in hole from boring, self compensation mechanism is extracted out by connecting pipe 21, is extracted out by ram hammer 12 by wire rope 22 from boring.
Utility model works principle is:
To construct a row hole drilling at down-hole coal bed roadway workface lateral wall.In each boring, vibroseis is installed.In hole, strainer expands locking in the borehole by swelling bag.By regulating the pneumatic source of ram hammer, hydraulic pressure source, hydraulic power source parameter and electromagnetic parameter, seismic wave energy, frequency size that adjustable vibroseis produces.Automatically ram hammer can be moved to new working position by self compensation mechanism, piston at the bottom of hole is pushed against at the bottom of hole, and make ram hammer tup keep with piston at the bottom of hole all the time needed for impact distance.By swelling bag is carried out off-load, strainer, self compensation mechanism in recovery holes, reclaim ram hammer by wire rope one by one.
Apply specific case herein to set forth structural principle of the present utility model and embodiment, above embodiment just understands method of the present utility model and core concept thereof for helping.For one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
The utility model does not relate to all same as the prior art maybe can the adopt prior art such as structure, principle of work of part as ram hammer, connecting line, rubber ring, accumulator and is realized.

Claims (6)

1. a combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis, is characterized in that it comprises:
Strainer in one hole, in this hole, strainer is used for vibroseis to be locked in the focus hole of boring in tunnel, prevents vibroseis from skidding off outside focus hole because impacting retroaction; In this hole, strainer is primarily of swelling bag (1), hollow tube (2) and terminal pad (5) composition, and swelling bag (1) is sleeved on hollow tube (2), and one end of terminal pad (5) is inserted in the insertion end of hollow tube (2);
One fluid pressure type self compensation mechanism, ram hammer (12) can be moved to new working position by this self compensation mechanism automatically so that for ram hammer (12) again piston (17) at the bottom of hammering hole required impact distance is provided;
One beater mechanism, this beater mechanism energy hammering foot of hole produces the vibrations for detecting;
One sleeve (4), this sleeve (4) is for linking into an integrated entity strainer, fluid pressure type self compensation mechanism and beater mechanism in hole and providing installing space for self compensation mechanism and beater mechanism;
One connecting line, for providing the power source needed for vibroseis and compensating power source.
2. vibroseis according to claim 1, is characterized in that described swelling bag (1) is pneumatic type, hydraulic type or hydraulic type swelling bag.
3. vibroseis according to claim 1, it is characterized in that described fluid pressure type self compensation mechanism comprises rear flange (7), piston cylinder (8), piston (9), spacer bar (10), described piston cylinder (8) is hydraulic type or hydraulic type piston cylinder, its front end is connected with rear flange (7), one end of piston (9) is arranged in piston cylinder (8), one end that the other end stretches out piston cylinder (8) and spacer bar (10) offsets, and the ram hammer (12) in the other end of spacer bar (10) and beater mechanism offsets to realize real-Time Compensation; Rear flange (7) is connected with the terminal pad (5) in strainer in hole by connecting link (6), thus realizes the connection of strainer and fluid pressure type self compensation mechanism in hole.
4. vibroseis according to claim 1, is characterized in that described beater mechanism comprises piston (17) at the bottom of hanger (11), ram hammer (12), rubber ring group (13), tup (14), spacer bar (15), rubber ring group (16) and hole; Described ram hammer (12) is pneumatic type, hydraulic type, fluid pressure type and electromagnetic type; Be sleeved on ram hammer (12) rubber ring group (13) and the rubber ring group (16) be sleeved on piston at the bottom of hole (17) makes piston (17) at the bottom of ram hammer (12) and hole coordinate with sleeve (4); Tup (14) is connected with the impact bar of ram hammer (12), and spacer bar (15) is arranged at the bottom of ram hammer (12) and hole between piston (17), and hanger (11) is connected with ram hammer (12) and is connected with one end and stretches out sleeve (4) connecting band outward (22).
5. vibroseis according to claim 1, is characterized in that in described hole, strainer is coordinated by step element (3) and sleeve (4).
6. vibroseis according to claim 1, it is characterized in that the first connecting pipe (20) from power to piston cylinder and the second connecting pipe (21) that provide are installed in described hollow tube (2), second connecting pipe (21) is connected with accumulator (18), and swelling bag (1) is connected with power source by the 3rd connecting pipe (19).
CN201420594273.9U 2014-10-14 2014-10-14 Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis Expired - Fee Related CN204101748U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420594273.9U CN204101748U (en) 2014-10-14 2014-10-14 Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420594273.9U CN204101748U (en) 2014-10-14 2014-10-14 Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis

Publications (1)

Publication Number Publication Date
CN204101748U true CN204101748U (en) 2015-01-14

Family

ID=52270165

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420594273.9U Expired - Fee Related CN204101748U (en) 2014-10-14 2014-10-14 Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis

Country Status (1)

Country Link
CN (1) CN204101748U (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105044778A (en) * 2015-08-28 2015-11-11 威海双丰物探设备股份有限公司 Oscillation detection apparatus in complex well
CN109100780A (en) * 2018-10-17 2018-12-28 上海申丰地质新技术应用研究所有限公司 Portable high-pressure gas impact origin gas compensation device
CN109709599A (en) * 2019-01-15 2019-05-03 东北大学 The device and method of microseismic sensors is installed and recycled in being crushed easy collapse hole rock mass
CN110187380A (en) * 2019-06-17 2019-08-30 中国铁建重工集团股份有限公司 Variable-frequency hydraulic impact seismic source
CN110261889A (en) * 2019-06-17 2019-09-20 中国铁建重工集团股份有限公司 Programmable control seismic source
CN112558143A (en) * 2020-12-23 2021-03-26 重庆大学 Multi-azimuth emission type portable electromagnetic impact seismic source

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105044778A (en) * 2015-08-28 2015-11-11 威海双丰物探设备股份有限公司 Oscillation detection apparatus in complex well
CN105044778B (en) * 2015-08-28 2019-05-21 威海双丰物探设备股份有限公司 Viberation detector in compound well
CN109100780A (en) * 2018-10-17 2018-12-28 上海申丰地质新技术应用研究所有限公司 Portable high-pressure gas impact origin gas compensation device
CN109100780B (en) * 2018-10-17 2023-09-22 上海申丰地质新技术应用研究所有限公司 Portable high-pressure gas impact seismic source gas compensation device
CN109709599A (en) * 2019-01-15 2019-05-03 东北大学 The device and method of microseismic sensors is installed and recycled in being crushed easy collapse hole rock mass
CN110187380A (en) * 2019-06-17 2019-08-30 中国铁建重工集团股份有限公司 Variable-frequency hydraulic impact seismic source
CN110261889A (en) * 2019-06-17 2019-09-20 中国铁建重工集团股份有限公司 Programmable control seismic source
CN112558143A (en) * 2020-12-23 2021-03-26 重庆大学 Multi-azimuth emission type portable electromagnetic impact seismic source
CN112558143B (en) * 2020-12-23 2022-03-04 重庆大学 Multi-azimuth emission type portable electromagnetic impact seismic source

Similar Documents

Publication Publication Date Title
CN204101748U (en) Combined type impulsion pressure hazardous location seismic tomography prospecting fluid pressure type self compensation vibroseis
CN104132761B (en) Multiple spot coal and rock stress real-time monitoring device and method
Hu et al. Enhancing coal seam gas using liquid CO2 phase-transition blasting with cross-measure borehole
CN103512693B (en) Coal and rock mass stress orientation monitoring method and device
CN102854525B (en) Omnidirectional cataclastic rock mass deep hole installation and recovery device of microseismic unidirectional sensor
CN104237025B (en) A kind of closing boring Mining failure simulation experiment method
CN101892830B (en) Deep ground stress measurement while drilling (MWD) system
CN203519230U (en) Coal-rock mass stress directional monitoring device
CN104653226A (en) Stress-gradient-based method for dividing coal impact ground pressure danger area
CN103076119A (en) Method for measuring floor heave main control stress of laneway
CN104155684B (en) Down-hole coal bed work surface the rock burst fatalness area shock wave CT detection self-compensation type controlled source and focus production method
CN112763694B (en) Two-dimensional similarity simulation test device and method for dynamic disturbance of mine exploitation
Zhu et al. Overburden movement characteristics of top-coal caving mining in multi-seam areas
CN204188814U (en) Utilize the seismic tomography prospecting self compensation vibroseis that roadway support body is fixing
CN106988738B (en) Detection method for determining ground stress distribution characteristics
CN103616111A (en) Small-hole thick-wall sleeve core stress relieving method
CN104234682B (en) A kind ofly be applicable to separate stratum fracturing of continuous oil pipe method that is many, girdle
Li et al. Deformation and fracture at floor area and the correlation with main roof breakage in deep longwall mining
Liu et al. Analysis of the dynamic response and impact parameters of pneumatic down-the-hole hammer drilling rescue holes
Yang et al. New insights into dynamic disaster monitoring through asynchronous deformation induced coal-gas outburst mechanism of tectonic and raw coal seams
CN105092105B (en) A kind of local overcoring method test device of Deep ground stress
CN109057777B (en) Measuring device for drilling drift diameter description and using method thereof
CN201892748U (en) Sensor-string equipment for superficial geological survey
CN203669931U (en) Multipoint stress detector for testing roadway surrounding rock broken rock zone
CN202648554U (en) Rock mass engineering blasting excavation damping device

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150114

Termination date: 20151014

EXPY Termination of patent right or utility model