CN105806515A - Segmented hole wall attaching type three-dimensional geostress measurement device - Google Patents
Segmented hole wall attaching type three-dimensional geostress measurement device Download PDFInfo
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- CN105806515A CN105806515A CN201610273158.5A CN201610273158A CN105806515A CN 105806515 A CN105806515 A CN 105806515A CN 201610273158 A CN201610273158 A CN 201610273158A CN 105806515 A CN105806515 A CN 105806515A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/08—Measuring force or stress, in general by the use of counterbalancing forces
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Abstract
The invention relates to a segmented hole wall attaching type three-dimensional geostress measurement device.A resin wrapping body is optimized in a segmenting mode, resin shell segments radially move to be closely attached to the hole wall, and therefore the influence of elastic modulus changes of a colloid can be ignored; the phenomenon that influences are generated to a measurement result due to the fact that the cured colloid is cracked under the high stress action is avoided; the coaxial problem is solved while the resin shell segments radially move to be closely attached to the hole wall, and the measurement precision is improved.The device can be widely applied to geostress measurement of rock mass engineering such as mines, water conservancy and hydropower, transportation tunnels.
Description
Technical field
The present invention relates to a kind of measurement crustal stress technical field, particularly relate to a kind of point of lobe and be close to hole wall formula three-dimension geosciences modeling device.
Background technology
Crustal stress is to cause mining engineering surrouding rock deformation, bring out the basic active force of bump phenomenon, and geostress survey data accurately are to realize science decision and the necessary precondition of design mining engineering.Along with mining constantly develops to deep, the impact of crustal stress is just all the more serious, and ignoring crustal stress affects and digging of blindly constructing, and mine safety production is subjected to serious threat.Only grasp the crustal stress states residing for mine, just can take rationally effective preventive measure, stop the Disasters such as surrouding rock deformation, bump, stability of the roadway and safety in production are of great significance.
The general method obtaining crustal stress comparative maturity has stress relief by borehole overcoring technique, hydraulic fracturing to launch based on three-dimensional solid matrix and CSIR 0 of Australia hollow inclusion stress gauge ultimate principle, the invention of the technology of this respect has: the acquisition methods of a CNIO3556992A fiber grating crustal stress, CNIO4390734A hollow inclusion stress gauge, and CNIO4280417A rock mass engineering project single hole multiple spot fiber grating hollow inclusion triaxiality test device etc..Comprehensive analysis and relatively above patent are concluded that 1. inclusion is misaligned with boring axle center, namely not coaxial；2. colloid is blocked up, and example CNIO4280417A uses cement to carry out coupling borehole wall, and under high stress, blocked up colloid cracking will directly affect certainty of measurement；3. inclusion wall is all be coupled by colloid with the gap of hole wall, and the bullet modingization of its colloid bring impact also can to the precision measured.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of point of lobe and be close to hole wall formula three-dimension geosciences modeling device, its purpose is to more accurately obtain three-dimensional ground stress.Resin-case lobe moves radially to be close to hole wall and realizes close coupling, synchronizes coaxial action effect, and design and disaster prevention for engineering support scheme provide precise information.
The technical solution adopted in the present invention is: a kind of point of lobe is close to hole wall formula three-dimension geosciences modeling device, and described device is advanced V-type steel disc groove at the bottom of V-type steel disc groove, reducing rigid casing, ribbon synthetic rubber block, ribbon colloid capsule, anti-arc at the bottom of valve, anti-arc to form by the straight connector that is rigidly connected, rigid connecting rod, resin-case lobe, foil gauge, tail cone, aperture；It is characterized in that, described rigid connecting rod, for hollow body, its one end is fixed with tail cone, and next-door neighbour's tail cone is sequentially connected with measurement parts, be rigidly connected straight connector and aperture propelling valve；Described measurement parts are provided with reducing rigid casing, its relatively butt end be connected with the straight connector that is rigidly connected, it is 3 circumferential uniform resin-case lobes outside thinner end, connected by V-type steel disc groove at the bottom of anti-arc between adjacent resin-case lobe, the top opening of cell body is axially in parallel with rigid connecting rod, bottom land is tangent with reducing rigid casing outer surface normal direction, is embedded in ribbon synthetic rubber block and ribbon colloid capsule and the elastic closure of cell body two ends bonding rubber matter in cell body by bottom land upstream sequence；Described reducing rigidity sleeve pipe and the straight connector that is rigidly connected are sleeved on rigid connecting rod slidably, and aperture advances valve to threaded with rigid connecting rod and and the straight connector rigid contact that is rigidly connected；Described tail cone is provided with pushing the conical cavity of reducing rigid casing, the uniform through wires hole of the surrounding of conical cavity；Being embedded with foil gauge in each resin-case lobe, the cable of described foil gauge passes through through wires hole and rigid connecting rod bar chamber, is connected with external data collecting device；When aperture propelling valve screws and promotes reducing rigid casing to move axially to tail cone direction along rigid connecting rod, V-type steel disc groove at the bottom of anti-arc is also affected by the axial restriction of tail cone while being subject to reducing rigid casing radial compression, open with two flapwise both sides of V-type steel disc groove at the bottom of anti-arc, its entirety also synchronizes to move radially, synchronize burst bar band of glue body capsule, colloid flows out, and then orders about resin-case lobe and move radially and be adjacent to borehole wall and fixing by colloid and the wall of a borehole bonding.
Described rigid connecting rod is split-type structural, is formed by more piece hollow rod body is threaded, and the length of each pole body is less than 1.5m.The described straight connector that is rigidly connected adopts split-type structural, multistage sleeve pipe head and the tail being rigidly connected forms, and the length of each section of sleeve pipe is 0.5～1.5m.The both ends of the described straight connector that is rigidly connected are provided with limit ear, and limit ear is provided with screw hole, and reducing rigid casing is provided with screw hole compared with the end face of butt end, between adjacent casing or sleeve pipe be connected by screw with reducing rigid casing.
The setting of said structure is not unique selection, it is possible to arrange flexibly according to the situation of job site.Such as, for side slope, some outdoor works of mine, and the situation that drilling depth is shallower (less than two meters) rigid connecting rod can also adopt monolithic construction, accordingly, the sleeve pipe that is rigidly connected can also adopt monolithic construction, is combined into a monoblock type measurement apparatus.
At the bottom of the corresponding anti-arc of the outer wall of described reducing rigid casing, the lower arcuate surface of V-type steel disc groove is provided with the guiding road of projection.Be diameter at the bottom of the anti-arc of V-type steel disc groove at the bottom of described anti-arc it is the semi arch of 2.3mm；The semicircle shape that cross section is 2mm in guiding road.At the bottom of described anti-arc, V-type steel disc groove normality lower groove angle is 10 °.V-type steel disc groove at the bottom of anti-arc is played guide effect by arranging of road of guiding, promotes V-type steel disc groove at the bottom of anti-arc to move radially simultaneously.
The cross section of described resin-case lobe is circular arc, is connected to the groove top margin edge of V-type steel disc groove at the bottom of anti-arc.The radius of described resin-case lobe is identical with the radius of boring, the corresponding angle of resin-case lobe less than with the number of housing lobe for radix by with the angle after the round decile that the radius of resin-case lobe is radius.Described block rubber, for filling white carbon black rubber master batch, is arranged in parallel at V-type steel disc trench bottom at the bottom of anti-arc and notch.
An a kind of point lobe is close to hole wall formula three-dimension geosciences modeling method, comprises the steps:
A. pore-creating, selects major diameter diamond bit perforate, creeps into predetermined hole depth, then creeps into length with small diameter drill bit with one heart and be about 200mm, then in cleaning boring；
B. by the rigid connecting rod installing caudal vertebra and measurement parts is put into boring behind clear hole, on rigid connecting rod, coat lubricating oil simultaneously；
C. then put the straight connector that is rigidly connected, reducing rigid casing screw is fixed with the straight connector that is rigidly connected；It is rigidly connected straight connector and rigid connecting rod is split-type structural, determine rigid connecting rod and the joint number of the straight connector that is rigidly connected according to hole depth, connect with screw between each joint sleeve pipe, threaded between each joint connecting rod, rigid connecting rod all scribbles lubricating oil；
D. be rigidly connected straight connector and the rigid connecting rod installed by step c are progressively advanced with installation progress in boring, until tail cone is advanced at the bottom of drilling hole；
E. mounting hole advances valve so that it is straight connector contacts with being rigidly connected；
F. rotate aperture and advance valve, to being rigidly connected, straight connector applies axial thrust, promote its axial advancement, make resin-case lobe radially strut and be adjacent to the wall of a borehole, colloid extrusion makes resin-case lobe and hole wall bonding, obtains aperture according to the relation between boring aperture size and measurement apparatus parameter and advances valve shaft to displacement:
In formula, S is that aperture advances valve to need the distance moved axially, DkIt is bore diameter, DsBeing 2 times of resin-case lobe arc apex distance rigid connecting rod centre distance, α is the angle of reducing rigid casing bus and axis；
G. stress relieving, after colloid solidifies, bores with major diameter diamond drill headgear and releases, adopt Portable explosion-proof resistance strain gauge record with the data releasing change in depth.
Compared with prior art, the invention has the beneficial effects as follows: the present invention adopts a point lobe method optimizing resin inclusion, and resin-case lobe moves radially is close to hole wall, and then the bullet modingization impact of colloid can be ignored；The colloid solidified is avoided to be produced to affect on measurement result by high stress cracking；Resin-case lobe moves radially and also synchronizes to solve concentricity problem while being close to hole wall, improves the degree of accuracy of measurement.The composite can be widely applied to the geostress survey of the rock mass engineering projects such as mine, water conservancy and hydropower and traffic tunnel.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Fig. 2 is A-A generalized section.
Fig. 3 is the sectional view of tail cone connecting portion.
Fig. 4 is one group of foil gauge arrangement schematic diagram.
In figure, be 1. rigidly connected straight connector, 1-1. limit ear, 2. rigid connecting rod, 3. reducing rigid casing, 3-1. leads road, 4. resin-case lobe, 5. foil gauge, 6. tail cone, 6-1. tapering, 6-2. connecting portion, 6-3. cone shaped body, 6-4. through wires hole, 7. aperture advances valve, 8. V-type steel disc groove at the bottom of anti-arc, 9. block rubber, 10. colloid capsule, 11. elastic closure, 12. cable, 13. screws, 14. borings.
Detailed description of the invention
Divide lobe to be close to hole wall formula three-dimension geosciences modeling device one of the present invention below in conjunction with accompanying drawing to further describe.
See accompanying drawing 1, the boring 10 being 54mm for diameter, an a kind of point lobe is close to hole wall formula three-dimension geosciences modeling device, and described device is advanced V-type steel disc groove 8 at the bottom of V-type steel disc groove 8, reducing rigid casing 3, ribbon synthetic rubber block 9, ribbon colloid capsule 10, anti-arc at the bottom of valve 7, anti-arc to form by the straight connector 1 that is rigidly connected, rigid connecting rod 2, the isolated resin-case lobe 4 of many groups, many group foil gauges 5, tail cone 6, aperture；Described rigid connecting rod 2 is hollow body, is formed by more piece body is threaded, its external diameter 16mm, internal diameter 8mm, and its one end is fixed with tail cone, and next-door neighbour's tail cone is sequentially connected with measurement parts, be rigidly connected straight connector 1 and aperture propelling valve 7；Often joint straight connector 1 external diameter that is rigidly connected be 24mm, internal diameter is 18mm, and length is 0.5～1.5m；Measure parts and be provided with reducing rigid casing 3, its largest outside diameter diameter is 44mm, minimum diameter is 20mm, long for 120mm, reducing rigid casing 3 is compared with butt end end face uniform three screw holes of circumference, the be rigidly connected both ends of straight connector 1 are provided with limit ear 1-1, limit ear 1-1 external diameter is 44mm, and on the ear 1-1 of limit, the screw hole on corresponding reducing rigid casing 3 is provided with screw hole, and is connected by screw 13；Described reducing rigidity sleeve pipe 3 and the straight connector 1 that is rigidly connected are sleeved on rigid connecting rod 2 slidably, and aperture advances valve 7 to threaded with rigid connecting rod 2；Described tail cone 6 includes tapering 6-1, connecting portion 6-2 and cone shaped body 6-3, connecting portion 6-2 is installed on the outside of rigid connecting rod 2, connecting portion 6-2 is provided with pushing the cone shaped body 6-3 of reducing rigid casing, uniform along its three through wires hole 6-4 axially offered around cone shaped body 6-3；It is three circumferential uniform resin-case lobes 4 outside reducing rigid casing 3 thinner end, connected by V-type steel disc groove 8 at the bottom of anti-arc between adjacent resin-case lobe 4, at the bottom of anti-arc, V-type steel disc groove 8 normality lower groove angle is 10 °, the top opening of cell body is axially in parallel with rigid connecting rod 2, bottom land is tangent with reducing rigid casing 3 outer surface normal direction, it is embedded in ribbon by bottom land upstream sequence in cell body and fills white carbon black rubber master batch synthetic rubber block 9 and ribbon colloid capsule 10, block rubber 9 is arranged in parallel with notch bottom V-type steel disc groove 8 at the bottom of anti-arc, cell body two ends bonding rubber elasticity closure 11, elastic closure 11 can open generation Flexible change with V-type steel disc groove 8 both wings at the bottom of anti-arc；The cross section of described resin-case lobe 4 is circular arc, is connected to the top trough rim of V-type steel disc groove 8 at the bottom of anti-arc, 102 ° of central angle corresponding to its arc diameter 54mm, circular arc, and three resin-case lobes 4 press the arrangement of 120 ° of central angle；Being embedded with foil gauge 5 in each resin-case lobe 4, foil gauge 5 is arranged on the middle part of each resin-case lobe 4, and the cable 12 of described foil gauge 5 passes through through wires hole 6-4 and rigid connecting rod 2 bar chamber, is connected with external data collecting device；When aperture propelling valve 7 screws and promotes reducing rigid casing 3 to move axially to tail cone 6 direction along rigid connecting rod 2, V-type steel disc groove 8 at the bottom of anti-arc is also affected by the axial restriction of tail cone 6 while being subject to reducing rigid casing 3 radial compression, open with two flapwise both sides of V-type steel disc groove 8 at the bottom of anti-arc, its entirety also synchronizes to move radially, synchronize burst bar band of glue body capsule 10, colloid flows out, and then orders about resin-case lobe 4 and move radially and be adjacent to borehole wall and fixing by colloid and the wall of a borehole bonding.
As it is shown on figure 3, the boring 10 being still 54mm for diameter, owing to anthropic factor affects, the actual borehole aperture that 54mm drill bit rotates into is larger than 54mm, it is 54mm that the present invention still takes the diameter of resin-case lobe 4, by calculating, takes its radian and is 102 ° and meets device designing requirement.
As shown in Figure 4, it is arc of the anti-end bottom V-type steel disc groove 8 at the bottom of anti-arc, the semi arch of its diameter 2.3mm, spatially 120 ° of layouts, at the bottom of the corresponding anti-arc of the outer wall of reducing rigid casing 3, the lower arcuate surface of V-type steel disc groove 8 is provided with the guiding road 3-1 of projection, the semicircle shape that cross section is 2mm of guiding road 3-1.Arc of the anti-end is stuck on the guiding road 3-1 on reducing rigid casing 3 just, and meanwhile, ribbon synthetic rubber block 9 is clipped between two steel discs and both wings and ensures that at V-type steel disc groove 8 angle at the bottom of anti-arc be 10 °, also ensures that test pre-structure is stable；V-type steel disc groove 8 at the bottom of anti-arc moves radially forces ribbon colloid capsule 10 to be torn under the effect of setting strip banding block rubber 9 while that both wings being opened, colloid overflows.In conjunction with example hole 14 and apparatus of the present invention parameter calculate obtain aperture advance valve 7 move axially distance for 50mm time, resin-case lobe 4 is just affixed closely with 14 hole walls of holing, synchronize to realize coaxially, therefore the thickness of colloid can be ignored and play the moding impact on certainty of measurement.
One of the present invention divides lobe to be close to hole wall formula three-dimension geosciences modeling method, comprises the steps:
A. pore-creating, selects 216mm diamond bit perforate, then creeps into about 200mm with one heart with 54mm drill bit, and clear up boring；
B. by the first segment rigid connecting rod 2 installing caudal vertebra 6 and measurement parts is put into boring 14 behind clear hole, on rigid connecting rod 2, coat lubricating oil simultaneously；
C. put first segment to be rigidly connected straight connector 1, reducing rigid casing 3 screw 13 is fixed with the straight connector 1 that is rigidly connected；Then second section or Section of three straight connector 1 that is rigidly connected it are sequentially connected with, until the sleeve pipe on first segment rigid connecting rod 2 installs；Second section rigid connecting rod 2 is threadeded with the first segment body of rod, and on the body of rod, coat lubricating oil to install the straight connector 1 that is rigidly connected on this pole body, by that analogy, until all of connecting rod and straight connector are installed according to 14 length of holing, and ensure last root connecting rod be provided externally with screw thread；
Mounted rigid connecting rod 2 is progressively advanced by the process d. installed in boring, until tail cone 6 being advanced at the bottom of boring 14 holes；
E. mounting hole advances valve 7 so that it is straight connector 1 contacts with being rigidly connected；
F. rotate aperture and advance valve 7, to being rigidly connected, straight connector 1 applies axial thrust, promote its axial advancement, make resin-case lobe 4 radially strut and be adjacent to the wall of a borehole, colloid extrusion makes resin-case lobe 4 and hole wall bonding, obtains aperture according to the relation holed between 14 aperture sizes and measurement apparatus parameter and advances valve 7 to move axially distance:
In formula, S is that aperture advances valve 7 to need the distance moved axially, DkIt is bore diameter, DsBeing 2 times of resin-case lobe 4 arc apex distance rigid connecting rod centre distance, α is the angle of reducing rigid casing 3 bus and axis；
G. stress relieving, after colloid solidifies, bores with 216mm diamond drill headgear and releases, adopt Portable explosion-proof resistance strain gauge record with the data releasing change in depth.
Claims (10)
1. a point lobe is close to a hole wall formula three-dimension geosciences modeling device, and described device is advanced V-type steel disc groove at the bottom of V-type steel disc groove, reducing rigid casing, ribbon synthetic rubber block, ribbon colloid capsule, anti-arc at the bottom of valve, anti-arc to form by the straight connector that is rigidly connected, rigid connecting rod, resin-case lobe, foil gauge, tail cone, aperture；It is characterized in that, described rigid connecting rod, for hollow body, its one end is fixed with tail cone, and next-door neighbour's tail cone is sequentially connected with measurement parts, be rigidly connected straight connector and aperture propelling valve；Described measurement parts are provided with reducing rigid casing, its relatively butt end be connected with the straight connector that is rigidly connected, it is 3 circumferential uniform resin-case lobes outside thinner end, connected by V-type steel disc groove at the bottom of anti-arc between adjacent resin-case lobe, the top opening of cell body is axially in parallel with rigid connecting rod, bottom land is tangent with reducing rigid casing outer surface normal direction, is embedded in ribbon synthetic rubber block and ribbon colloid capsule and the elastic closure of cell body two ends bonding rubber matter in cell body by bottom land upstream sequence；Described reducing rigidity sleeve pipe and the straight connector that is rigidly connected are sleeved on rigid connecting rod slidably, and aperture advances valve to threaded with rigid connecting rod and and the straight connector rigid contact that is rigidly connected；Described tail cone is provided with pushing the conical cavity of reducing rigid casing, the uniform through wires hole of the surrounding of conical cavity；Being embedded with foil gauge in each resin-case lobe, the cable of described foil gauge passes through through wires hole and rigid connecting rod bar chamber, is connected with external data collecting device；When aperture propelling valve screws and promotes reducing rigid casing to move axially to tail cone direction along rigid connecting rod, V-type steel disc groove at the bottom of anti-arc is also affected by the axial restriction of tail cone while being subject to reducing rigid casing radial compression, open with two flapwise both sides of V-type steel disc groove at the bottom of anti-arc, its entirety also synchronizes to move radially, synchronize burst bar band of glue body capsule, colloid flows out, and then orders about resin-case lobe and move radially and be adjacent to borehole wall and fixing by colloid and the wall of a borehole bonding.
2. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that described rigid connecting rod is split-type structural, is formed by more piece hollow rod body is threaded.
3. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that described in the straight connector that is rigidly connected adopt split-type structural, be rigidly connected formed by multistage sleeve pipe head and the tail；The both ends of the described straight connector that is rigidly connected are provided with limit ear, and limit ear is provided with screw hole, are provided with screw hole with notch reducing rigid casing compared with the end face of butt end, between adjacent casing or sleeve pipe be connected by screw with reducing rigid casing.
4. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that at the bottom of the corresponding anti-arc of the outer wall of described reducing rigid casing, the lower arcuate surface of V-type steel disc groove is provided with the guiding road of projection.
5. one according to claim 4 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that be diameter at the bottom of the anti-arc of V-type steel disc groove at the bottom of described anti-arc be the semi arch of 2.3mm；The semicircle shape that cross section is 2mm in guiding road.
6. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that at the bottom of described anti-arc, V-type steel disc groove normality lower groove angle is 10 °.
7. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that the cross section of described resin-case lobe is circular arc, is connected to the groove top margin edge of V-type steel disc groove at the bottom of anti-arc.
8. one according to claim 7 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterized in that, the radius of described resin-case lobe is identical with the radius of boring, the corresponding angle of resin-case lobe less than with the number of housing lobe for radix by with the angle after the round decile that the radius of resin-case lobe is radius.
9. one according to claim 1 divides lobe to be close to hole wall formula three-dimension geosciences modeling device, it is characterised in that described block rubber, for filling white carbon black rubber master batch, is arranged in parallel at V-type steel disc trench bottom at the bottom of anti-arc and notch.
10. require that described one divides lobe to be close to hole wall formula three-dimension geosciences modeling method according to claim 1～9 any one, it is characterised in that comprise the steps:
A. pore-creating, selects major diameter diamond bit perforate, creeps into predetermined hole depth, then creeps into length with small diameter drill bit with one heart and be about 200mm, then in cleaning boring；
B. by the rigid connecting rod installing caudal vertebra and measurement parts is put into boring behind clear hole, on rigid connecting rod, coat lubricating oil simultaneously；
C. then put the straight connector that is rigidly connected, reducing rigid casing screw is fixed with the straight connector that is rigidly connected；It is rigidly connected straight connector and rigid connecting rod is split-type structural, determine rigid connecting rod and the joint number of the straight connector that is rigidly connected according to hole depth, connect with screw between each joint sleeve pipe, threaded between each joint connecting rod, rigid connecting rod all scribbles lubricating oil；
D. be rigidly connected straight connector and the rigid connecting rod installed by step c are progressively advanced with installation progress in boring, until tail cone is advanced at the bottom of drilling hole；
E. mounting hole advances valve so that it is straight connector contacts with being rigidly connected；
F. rotate aperture and advance valve, to being rigidly connected, straight connector applies axial thrust, promote its axial advancement, make resin-case lobe radially strut and be adjacent to the wall of a borehole, colloid extrusion makes resin-case lobe and hole wall bonding, obtains aperture according to the relation between boring aperture size and measurement apparatus parameter and advances valve shaft to displacement:
In formula, S is that aperture advances valve to need the distance moved axially, DkIt is bore diameter, DsBeing 2 times of resin-case lobe arc apex distance rigid connecting rod centre distance, α is the angle of reducing rigid casing bus and axis；
G. stress relieving, after colloid solidifies, bores with major diameter diamond drill headgear and releases, adopt Portable explosion-proof resistance strain gauge record with the data releasing change in depth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610273158.5A CN105806515B (en) | 2016-04-28 | 2016-04-28 | One kind divides valve to be close to hole wall formula three-dimension geosciences modeling device |
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| CN201610273158.5A CN105806515B (en) | 2016-04-28 | 2016-04-28 | One kind divides valve to be close to hole wall formula three-dimension geosciences modeling device |
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| CN107389235A (en) * | 2017-08-23 | 2017-11-24 | 晋能集团有限公司 | A kind of stress of coal pillar sensor |
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