CN205229149U - Bi -polar shutoff integrated observation system of leaking hunting - Google Patents
Bi -polar shutoff integrated observation system of leaking hunting Download PDFInfo
- Publication number
- CN205229149U CN205229149U CN201521015362.4U CN201521015362U CN205229149U CN 205229149 U CN205229149 U CN 205229149U CN 201521015362 U CN201521015362 U CN 201521015362U CN 205229149 U CN205229149 U CN 205229149U
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- shutoff
- pipe
- water
- piston
- capsule
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Abstract
The utility model discloses a bi -polar shutoff integrated observation system of leaking hunting belongs to mine top bottom plate rock mass and destroys scope determination field. Including blockage system, guide system, supply with propulsion system and pressure cycle system, blockage system includes communicating pipe, be located the first shutoff unit and the second shutoff unit at communicating pipe both ends, first shutoff unit is close to the inboard of rock mass drilling, the shutoff unit includes water leaking pipe, the connection is at the tubular joint and the shutoff capsule at water leaking pipe both ends, it connects to pass through shutoff unit and communicating pipe tubular joint, the water leaking pipe that the shutoff capsule set up at two tubular joint is peripheral, form certain shutoff space between shutoff capsule and the water leaking pipe. The utility model discloses a cooperation of blockage system and pressure cycle system has realized integrated in -process shutoff water source and to observing water source pressure cycle, has solved observation in -process shutoff water source and observed water source work problem under each autogenous pressure power, has avoided observing the katogene of water source hypertonia to the drilling crack.
Description
Technical field
The utility model relates to roof and floor rock mass damage scope determination techniques field, mine, is specifically related to a kind of double-end sealing leak detection combined geometry.
Background technology
The measurement of mine roof and floor rock mass damage scope is the important parameter of mark coal petrography occurrence status.When studying mine water management, it is a critical underlying parameter, and therefore, the formation of the conduit pipe in country rock is adopted in research, is just necessary grasp strata movement rule and determine roof and floor rock mass damage scope.The means such as usual employing numerical simulation, experimental formula expectation, field measurement.
But because field condition is complicated, to a certain extent, numerical simulation well can not reflect field condition, the blindness that experimental formula is estimated is comparatively large, and along with adopting dark increasing, experimental formula applicability worse and worse.Because the number of tubes worked in existing scope is too much simultaneously, especially in progradation, easily occur that boring interior conduit is wound around problem, in addition, in actual observation process, shutoff pressure generally gets 2.5MPa, boring observation hydraulic pressure generally gets 0.1MPa, in boring, observation source pressure can not be excessive, otherwise, dilating effect can be formed to preexisting crack in borehole wall.Under same external source, how to allow shutoff water source in integrated scope work under respective pressure with observation water source, prior art fails to solve above-mentioned two problems simultaneously simultaneously.
Utility model content
The purpose of this utility model is to provide a kind of double-end sealing leak detection combined geometry, this recording geometry can realize shutoff simultaneously and to leak hunting integration, decrease the number of tubes simultaneously worked in boring, and shutoff can be completed to leak hunting the pressure conversion to observation low pressure water source of integration and blocking high-pressure water source.
Its technical solution comprises:
Shutoff for mine roof and floor rock mass is leaked hunting a combined geometry, and it comprises plugging system, guidance system, supply propulsion system and pressure converting system;
Described plugging system comprise communicating pipe, the communicating pipe of being positioned at two ends the first shutoff unit and the second shutoff unit, described first shutoff unit is near the inner side of rock body drilled, wherein, each shutoff unit includes the pipe that leaks, is connected to tubular configured joint and the shutoff capsule at the pipe two ends that leak, each shutoff unit and all being connected by described tubular configured joint between communicating pipe, described shutoff capsule is arranged on the pipe periphery that leaks of two tubular configured joints, described shutoff capsule and leak between pipe and form certain shutoff space;
Described pressure converting system comprises hydraulic pressure converter and draw-in groove pipe adapter, described hydraulic pressure converter is connected on the tubular configured joint of described first shutoff unit tail by draw-in groove pipe adapter, described hydraulic pressure converter comprises piston and matrix two parts, the area of described piston left side is greater than the area of right side, the water-guiding hole be interconnected is provided with in described piston, the water-guiding hole being positioned at right-hand member is connected with described draw-in groove pipe adapter by aperture, by matrix inner wall sealing when the water-guiding hole being positioned at left end starts, the right-hand member of piston is provided with boss, described boss is used for carrying out spacing to the spring in piston, described piston keeps being communicated with or closing in order to control left end water-guiding hole and the boring in country rock,
Described guidance system comprises guide cone, and described guide cone is connected with the tubular configured joint of described first shutoff unit header;
Described supply propulsion system was communicated with described communicating pipe, for water filling in described communicating pipe, showed and recorded parameters.
The Advantageous Effects that technique scheme is directly brought is:
Piston is the anisometric right cylinders in two ends, left and right, and the right cylinder piston area area that left end is larger is S
outward, contact hydraulic pressure is P
outward, the right cylinder piston area area that right-hand member is less is S
in, contact hydraulic pressure is P
in.There is a boss to arrange near the right-hand member of piston, coordinated with intrinsic silicon corresponding site by spring, guarantee piston unlikely disengaging matrix while movement in matrix.The water-guiding hole be interconnected is provided with in piston, be positioned at right-hand member water-guiding hole to be connected with draw-in groove pipe adapter by aperture, be positioned at by matrix inner wall sealing when left end water-guiding hole starts, when piston stretch out left matrix be greater than a certain position time, left end water-guiding hole with boring be communicated with.
Hydraulic pressure converter principle of work is:
The right cylinder piston area area that left end is larger is S
outward, contact hydraulic pressure is boring observation hydraulic pressure P
outward, the right cylinder piston area area that right-hand member is less is S
in, contact hydraulic pressure is P
in, spring Elastic coefficient k, decrement x, from balance between two forces principle:
Work as F
outward+ F
bullet>=F
in, i.e. P
outwards
outward+ kx>=P
ins
in, then hydraulic pressure converter is in closed condition, and piston is not outer to be moved, and water-guiding hole is stopped by matrix inwall, can not be communicated with boring.
Work as F
outward+ F
bulletf≤F
in, i.e. P
outwards
outward+ kx≤P
ins
in, then hydraulic pressure converter is in opening, and piston outwards moves, and water-guiding hole exposes matrix inwall, is communicated with boring, carries out moisturizing in boring.
Said process both can realize (referring to that boring is interior) laterally by interior survey (referring to shutoff capsule) blocking high-pressure water (being generally 2.5MPa), and observation low-pressure water (0.1MPa) transforms, and can realize again real-time moisturizing process in boring as required.
Wherein, P
outwardfor observation hydraulic pressure, engineering often gets 0.1MPa, P
infor playing swollen shutoff capsule hydraulic pressure in plugging system, engineering often gets 2.5MPa, it can thus be appreciated that, S
outwardwith S
inratio be about 10 ~ 25:1, consider that area difference is too large, therefore add spring and regulate, one is to reduce inside and outside area ratio, is convenient to actual manufacture needs, and two is to make piston can self-return.
As a preferred version of the present utility model, described tubular configured joint is provided with lug boss vertically upward and vertically downward, described shutoff capsule is wrapped in the pipe periphery that leaks of two lug bosses.
As another preferred version of the present utility model, on the tubular configured joint being positioned at the pipe side that leaks of lug boss certain distance, be provided with groove, described shutoff capsule is fixed by coordinating with fixture by described groove.
Preferably, described supply propulsion system comprises water flood operations platform, pressure of return water table, electronic logger, rig and drilling rod, described water flood operations platform provides high-pressure water within described communicating pipe, described electronic logger is installed on water flood operations platform, and described pressure of return water table is used for carrying out correct detection to the pressure of return water in return pipe.
Preferably, the area of described piston left side and the area ratio of right side are 10 ~ 25:1.
Compared with prior art, the Advantageous Effects of this system is:
1, the shutoff achieving recording geometry is leaked hunting integration, decreases the number of tubes simultaneously worked in boring, to solve in progradation multi-pipeline in boring and is mutually wound around problem.
2, by the cooperation of plugging system and pressure converting system, achieve shutoff water source in integrated process to change to observation source pressure, solve shutoff water source and observation water source in observation process and, in respective pressure operation problem, avoid observation water source hypertonia to the destruction of borehole fissure.
3, improve stability and the accuracy of mine roof and floor rock mass damage scope measuring process, avoid observation water source hypertonia to the destruction of borehole fissure, for the stability of mine roof and floor rock mass damage scope measuring process and accuracy lay the foundation.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is elaborated:
Fig. 1 is the structural representation of the utility model recording geometry;
Fig. 2 is test probe overall schematic in the utility model recording geometry;
Fig. 3 is the structural representation of the first shutoff unit in the utility model recording geometry;
Fig. 4 is the structural representation of the second shutoff unit in the utility model recording geometry;
Fig. 5,6 is pressure conversion system structure schematic diagram;
Fig. 7,8 is hydraulic pressure converter structure schematic diagram;
Fig. 9,10 is the utility model draw-in groove pipe joint structure schematic diagram;
Figure 11 is hydraulic pressure switcher state schematic diagram in the utility model pressure converting system;
Figure 12 is guide cone structural representation in the utility model recording geometry;
In figure, 1, rock mass, 2, boring, 3, shutoff capsule, 4, communicating pipe, 5, hydraulic pressure converter, 6, tubular configured joint one, 7, leak pipe, 8, draw-in groove pipe adapter, 9, tubular configured joint three, 10, high-pressure hose, 11, drilling rod, 12, rig, 13, water flood operations platform, 14, guide cone, 15, tubular configured joint two, 16, piston, 17, water-guiding hole, 18, spring, 19, boss, 20, matrix, 21, aperture.
Embodiment
The utility model proposes a kind of double-end sealing leak detection combined geometry, in order to make advantage of the present utility model, technical scheme clearly, clearly, below in conjunction with specific embodiment, explanation clear, complete further being done to the utility model.
The utility model, double-end sealing leak detection combined geometry, shown in composition graphs 1 to Fig. 8, it comprises plugging system, pressure converting system, guidance system and supply propulsion system, wherein, supply propulsion system in detail as shown in Figure 1, comprise water flood operations platform 13, drilling rod 11, rig 12, wherein, water flood operations platform 13 is responsible for providing fixation pressure water source, by high-pressure hose 10, drilling rod 11 is connected with combined geometry, rig 12 is responsible for propelling integrated recording geometry to corresponding observation area, water flood operations platform 13 comprises flowmeter, tensimeter, be respectively used to observation injection flow and water injection pressure, rig 12 is responsible for propelling integrated recording geometry to corresponding observation area, work operation method reference prior art for supply propulsion system and recording geometry can realize.
Plugging system refers to shown in Fig. 1 to Fig. 4, comprise communicating pipe 4 and the first shutoff unit and the second shutoff unit that are positioned at communicating pipe 4 two ends, first shutoff unit is in the inner side near rock body drilled, second shutoff unit is positioned at away from rock body drilled side, wherein, second shutoff unit comprises two tubular configured joints 1, leak pipe 7 and shutoff capsule 3, first shutoff unit comprises tubular configured joint 2 15, the pipe 7 that leaks, tubular configured joint 39 and shutoff capsule 3; Communicating pipe 4 is a closed conduit, and its left end is threaded by tubular configured joint 1 and the second shutoff unit, and its right-hand member is threaded by pressure converting system and the first shutoff unit.
Pipe 7 two ends that leak in second shutoff unit are threaded with two tubular configured joints 1 respectively, leak on pipe 7 and have two leaking holes, tubular configured joint 1 outer setting convex architecture and groove, wherein, convex architecture can be lug boss vertically upward and vertically downward, or with other lug boss of this similar, shutoff capsule 3 is blocked in the effect of lug boss, with anti-slip, the effect of groove is fixed thereon by shutoff capsule 3 by fixed component.Wherein, convex architecture is in order to block shutoff capsule 3, and with anti-slip, shutoff capsule 3 is fixed thereon by fixed component by groove, shutoff capsule 3 surrounds in the groove-like structure of two tubular configured joints 1, by coordinating with the pipe 7 that leaks the space having formed swollen shutoff capsule 3.
Pipe about 7 two ends that leak in first shutoff unit are threaded with tubular configured joint 2 15, tubular configured joint 39 respectively, tubular configured joint 25, tubular configured joint 39 outer setting groove-like structure, shutoff capsule 3 is fixed by fixed component, shutoff capsule 3 surrounds in tubular configured joint 2 15, tubular configured joint 39 outer setting groove-like structure, by coordinating with the pipe 7 that leaks the space having formed swollen shutoff capsule 3.
Communicating pipe 4 only has one, is threaded with the first shutoff unit and the second shutoff unit respectively by tubular configured joint 1, draw-in groove pipe adapter 8.
Pressure converting system refers to shown in Fig. 5 to Figure 11, comprises hydraulic pressure converter 5 and draw-in groove pipe adapter 8; Draw-in groove pipe adapter 8 left end was threaded with communicating pipe 4, and right-hand member is threaded with tubular configured joint 2 15, and draw-in groove pipe adapter 8 left side exterior lateral area and 4 hydraulic pressure converters 5 are threaded.
Hydraulic pressure converter 5 comprises piston 16 and matrix 20 two parts, and piston 16 is in the anisometric right cylinder in two ends, left and right, and right cylinder piston 16 areas that left end is larger are S
outward, contact hydraulic pressure is P
outward, right cylinder piston 16 areas that right-hand member is less are S
in, contact hydraulic pressure is P
in.Right-hand member near piston 16 has a boss 19 to arrange, coordinated with the inner corresponding site of matrix 20 by spring 18, ensure piston 16 unlikely disengaging matrix 20 while movement in matrix 20, the water-guiding hole 17 be interconnected is provided with in piston 16, right-hand member water-guiding hole 17 is connected with draw-in groove pipe adapter 8 by aperture 21, by matrix 20 inner wall sealing when left end water-guiding hole 17 starts, when piston 16 stretch out left matrix be greater than a certain position time, left end water-guiding hole 17 2 to be communicated with boring.
Above-mentioned hydraulic pressure converter 5 principle of work is:
Right cylinder piston 16 areas that left end is larger are S
outward, contact hydraulic pressure is that hydraulic pressure P is observed in boring 2
outward, right cylinder piston 16 areas that right-hand member is less are S
in, contact hydraulic pressure is II type shutoff end section shutoff hydraulic pressure P
in, spring 18 Elastic coefficient k, decrement x, from balance between two forces principle:
Work as F
outward+ F
bullet>=F
in, i.e. P
outwards
outward+ kx>=P
ins
in, then hydraulic pressure converter 5 is in closed condition, and piston 16 is not outer to be moved, and water-guiding hole 17 is stopped by matrix 20 inwall, can not be communicated with boring 2.
Work as F
outward+ F
bulletf≤F
in, i.e. P
outwards
outward+ kx≤P
ins
in, then hydraulic pressure converter 5 is in opening, and piston 16 outwards moves, and water-guiding hole 17 exposes matrix 20 inwall, is communicated with boring 2, carries out moisturizing in boring 2.
Said process both can realize (referring in boring 2) that observation low-pressure water (0.1MPa) transforms laterally by interior survey (referring to shutoff capsule 3) blocking high-pressure water (being generally 2.5MPa), can realize again real-time moisturizing process in boring 2 as required.
Wherein, P
outwardfor observation hydraulic pressure, engineering often gets 0.1MPa, P
infor playing swollen shutoff capsule 3 hydraulic pressure in plugging system, engineering often gets 2.5MPa, it can thus be appreciated that, S
outwardwith S
inratio be about 25:1, consider that area difference is too large, therefore add spring 18 and regulate, one is to reduce inside and outside area ratio, is convenient to actual manufacture needs, and two is to make piston 16 can self-return.
Guidance system refers to shown in Fig. 1 and Figure 12, comprises guide cone 14, is threaded with tubular configured joint 39, and guide cone 14 is a conical structure, be convenient to occur in boring 2 uneven step-like time, play guide effect.
Elaborate to the observation procedure of the utility model double-end sealing leak detection combined geometry below, key step comprises:
(1) drilling 2: with conventional coal mine drilling machine 12 in coal petrography tunnel in top board or floor rock 1 successively construction predetermined angular hole two, hole depth does not reach 30-70m not etc.;
(2) recording geometry is installed: the foreign material in cleaning boring 2, in boring 2, recording geometry is installed, connects rig 12, water flood operations platform 13 etc. by high-pressure hose 10 corresponding pipeline, and utilize rig 12 and drilling rod 11 to be sent to boring 2 initial position;
(3) close boring 2: arrive after initial position until it, play a swollen shutoff capsule 3 and seal boring 2, namely reach predetermined hydraulic pressure with the water source that water flood operations platform 13 injects fixation pressure in the first shutoff unit and the second shutoff unit to it;
(4) measure flowing water vector parameters: after shutoff is qualified, carry out flowing water vector parameters mensuration, namely after stable water pressure, wait for 1-2 minute, read the total flow in this period, record flow value in the unit of account time.Withdraw pressure water source, make shutoff capsule 3 be in depressurization phase, then utilize rig 12 and drilling rod 11 mobile observation system to next observation port section, repeat step 3 to step 4, successively boring 2 is measured.
The part do not addressed in the utility model adopts or uses for reference prior art and can realize.
Although the such as term such as hydraulic pressure converter, draw-in groove pipe adapter is employed herein more; but do not get rid of the possibility using other term; those skilled in the art under enlightenment of the present utility model to the simple replacement that these terms do, all should within protection domain of the present utility model.
Claims (5)
1. a double-end sealing leak detection combined geometry, is characterized in that: described recording geometry is used for mine roof and floor rock mass, comprises plugging system, guidance system, supply propulsion system and pressure converting system;
Described plugging system comprise communicating pipe, the communicating pipe of being positioned at two ends the first shutoff unit and the second shutoff unit, described first shutoff unit is near the inner side of rock body drilled, wherein, each shutoff unit includes the pipe that leaks, is connected to tubular configured joint and the shutoff capsule at the pipe two ends that leak, each shutoff unit and all being connected by described tubular configured joint between communicating pipe, described shutoff capsule is arranged on the pipe periphery that leaks of two tubular configured joints, described shutoff capsule and leak between pipe and form certain shutoff space;
Described pressure converting system comprises hydraulic pressure converter and draw-in groove pipe adapter, described hydraulic pressure converter is connected on the tubular configured joint of described first shutoff unit tail by draw-in groove pipe adapter, described hydraulic pressure converter comprises piston and matrix two parts, the area of described piston left side is greater than the area of right side, the water-guiding hole be interconnected is provided with in described piston, the water-guiding hole being positioned at right-hand member is connected with described draw-in groove pipe adapter by aperture, by matrix inner wall sealing when the water-guiding hole being positioned at left end starts, the right-hand member of piston is provided with boss, described boss is used for carrying out spacing to the spring in piston, described piston keeps being communicated with or closing in order to control left end water-guiding hole and the boring in country rock,
Described guidance system comprises guide cone, and described guide cone is connected with the tubular configured joint of described first shutoff unit header;
Described supply propulsion system was communicated with described communicating pipe, for water filling in described communicating pipe, showed and recorded parameters.
2. double-end sealing leak detection combined geometry according to claim 1, is characterized in that: described tubular configured joint is provided with lug boss vertically upward and vertically downward, and described shutoff capsule is wrapped in the pipe periphery that leaks of two lug bosses.
3. double-end sealing leak detection combined geometry according to claim 2, is characterized in that: on the tubular configured joint being positioned at the pipe side that leaks of lug boss certain distance, be provided with groove, described shutoff capsule is fixed by coordinating with fixture by described groove.
4. double-end sealing leak detection combined geometry according to claim 1, it is characterized in that: described supply propulsion system comprises water flood operations platform, pressure of return water table, electronic logger, rig and drilling rod, described water flood operations platform provides high-pressure water within described communicating pipe, described electronic logger is installed on water flood operations platform, and described pressure of return water table is used for carrying out correct detection to the pressure of return water in return pipe.
5. double-end sealing leak detection combined geometry according to claim 1, is characterized in that: the area of described piston left side and the area ratio of right side are 10 ~ 25:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015362.4U CN205229149U (en) | 2015-12-09 | 2015-12-09 | Bi -polar shutoff integrated observation system of leaking hunting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521015362.4U CN205229149U (en) | 2015-12-09 | 2015-12-09 | Bi -polar shutoff integrated observation system of leaking hunting |
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| Publication Number | Publication Date |
|---|---|
| CN205229149U true CN205229149U (en) | 2016-05-11 |
Family
ID=55904206
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|---|---|---|---|
| CN201521015362.4U Expired - Fee Related CN205229149U (en) | 2015-12-09 | 2015-12-09 | Bi -polar shutoff integrated observation system of leaking hunting |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372410A (en) * | 2015-12-09 | 2016-03-02 | 山东科技大学 | Double-terminal plugging leak hunting integrated observing system |
| CN107191165A (en) * | 2017-04-19 | 2017-09-22 | 中煤科工集团西安研究院有限公司 | Both-end blocks water filling device in hole |
| CN107630675A (en) * | 2017-10-13 | 2018-01-26 | 大连理工大学 | A kind of rock body quality of mine drilling gas closure test probe and closure extraction system |
| CN108590569A (en) * | 2018-04-20 | 2018-09-28 | 大连理工大学 | Borehole sealing leaks hunting integrated multistage observation system |
| CN108643899A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | Mine roof and floor Mining failure band is segmented observation procedure |
| CN108643891A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | A kind of single loop overlying strata crack double-end sealing leak detection method |
| CN108645774A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | A kind of single loop overlying strata crack double-end sealing leak detection system |
| CN108643901A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | The observation procedure of multi-stage stepped decompression water filling based on crack observation |
| CN108643900A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | Mine roof and floor Mining failure band is segmented observation system |
| CN108845101A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified buck borehole fissure detection system |
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2015
- 2015-12-09 CN CN201521015362.4U patent/CN205229149U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105372410A (en) * | 2015-12-09 | 2016-03-02 | 山东科技大学 | Double-terminal plugging leak hunting integrated observing system |
| CN107191165A (en) * | 2017-04-19 | 2017-09-22 | 中煤科工集团西安研究院有限公司 | Both-end blocks water filling device in hole |
| CN107630675A (en) * | 2017-10-13 | 2018-01-26 | 大连理工大学 | A kind of rock body quality of mine drilling gas closure test probe and closure extraction system |
| CN108590569A (en) * | 2018-04-20 | 2018-09-28 | 大连理工大学 | Borehole sealing leaks hunting integrated multistage observation system |
| CN108643899A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | Mine roof and floor Mining failure band is segmented observation procedure |
| CN108643891A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | A kind of single loop overlying strata crack double-end sealing leak detection method |
| CN108645774A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | A kind of single loop overlying strata crack double-end sealing leak detection system |
| CN108643901A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | The observation procedure of multi-stage stepped decompression water filling based on crack observation |
| CN108643900A (en) * | 2018-04-20 | 2018-10-12 | 大连理工大学 | Mine roof and floor Mining failure band is segmented observation system |
| CN108845101A (en) * | 2018-04-20 | 2018-11-20 | 大连理工大学 | It is classified buck borehole fissure detection system |
| CN108845101B (en) * | 2018-04-20 | 2019-11-05 | 大连理工大学 | It is classified buck borehole fissure detection system |
| CN108645774B (en) * | 2018-04-20 | 2020-05-19 | 大连理工大学 | Single-loop overburden fracture double-end plugging leakage detection system |
| CN108643891B (en) * | 2018-04-20 | 2021-08-17 | 大连理工大学 | Single-loop overburden fracture double-end plugging and leakage detection method |
| CN108643899B (en) * | 2018-04-20 | 2021-08-17 | 大连理工大学 | Mining destructive zone segmented observation method for mine roof and floor |
| CN108643901B (en) * | 2018-04-20 | 2021-08-17 | 大连理工大学 | Multi-section graded pressure reduction water injection observation method based on fracture observation |
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| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160511 Termination date: 20161209 |