CN110044709A - A kind of monitoring device for true triaxial test - Google Patents
A kind of monitoring device for true triaxial test Download PDFInfo
- Publication number
- CN110044709A CN110044709A CN201910468247.9A CN201910468247A CN110044709A CN 110044709 A CN110044709 A CN 110044709A CN 201910468247 A CN201910468247 A CN 201910468247A CN 110044709 A CN110044709 A CN 110044709A
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- Prior art keywords
- probe
- true triaxial
- test
- temperature probe
- monitoring device
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The invention discloses a kind of monitoring devices for true triaxial test, including acoustic emission monitor(ing) component and temperature monitoring elements；The acoustic emission monitor(ing) component includes sonic probe and Acoustic radiating instrument, and sonic probe is embedded in the groove of surface of test piece, and the signal wire of sonic probe is drawn from true triaxial charging assembly and connect with Acoustic radiating instrument；The temperature monitoring elements include temperature probe and signal collecting device, the temperature probe is inserted in the installing blind of surface of test piece, the erection joint with temperature probe corresponding matching is equipped in the installing blind, the cable of temperature probe is drawn from true triaxial charging assembly and connect with signal collecting device.It can effectively avoid the interference of external irrelevant signal, guarantee the monitoring accuracy of sonic probe and temperature probe, so that the data more true and accurate obtained.
Description
Technical field
The present invention relates to a kind of rock mechanics experiment devices, and in particular to a kind of monitoring device for true triaxial test.
Background technique
During true triaxial crushing test, it usually needs detect crackle of the test specimen in fracturing process by sound emission and rise
The process split and developed, often due to Probe arrangement and sealing are met difficulty, usually under the conditions of thering is hyperbaric chamber to add confining pressure, probe
It can only be arranged in the response situation for measuring sound emission by way of being close to high pressure bulkhead out of my cabin, then pass through Jie inside hyperbaric chamber
The case where transmitting effect of matter indirectly measures sound emission.
Most of materials can be changed in vibration or fracture by sound emission with monitoring signals, the sound emission of many materials
Signal strength is very weak, needs more direct method that could extract signal and is possible to measurement accurately.Therefore, test specimen is being tested
Real change situation in the process cannot really and directly react, the side that can only be often transmitted by indirect confining pressure medium
Method is monitored, and measuring signal does not have accuracy and authenticity.
Acoustic emission monitor(ing) test is carried out in existing true triaxial, common practice is attached to sonic probe on load column,
Obtained sound emission noise data is very big.On the one hand be due to have passed through multiple contact interfaces between sonic probe and test specimen, and
The contact quality of each contact interface cannot be effectively ensured；Stress wave has reflection loss when passing through contact surface, effectively believes
Number have very big decaying.On the other hand, the cavity of rock true triaxial test machine and load column are larger by external interference, at present
Widely applied rock true triaxial test machine all uses SERVO CONTROL；Rock true triaxial test machine in the process of running can be to load
Column carries out continuous loading action, and generates a large amount of interference signal.
CN105842343A discloses a kind of Experimental on acoustic emission device that acoustic emission sensor is built in true triaxial chamber,
Acoustic emission sensor is close to by it using spring and push rod with test specimen, this method for arranging be easy to cause after catalase clast into
Enter in acoustic emission sensor channel, it can be by acoustic emission sensor extrusion damage when serious；Due to acoustic emission sensor and cushion block it
Between without shielding measure, acoustic emission sensor may contact with each other between cushion block during the test, machine generate interference
Signal can be conducted by cushion block to acoustic emission sensor, so that interference generates the acquisition of acoustic emission signal to test specimen.
CN107219122A discloses a kind of acoustic emission test device and carries out true triaxial to rock sample using the device
The method of test.At least one sound emission module is set in crimp body, on the one hand, the first spacer ring and the second isolating pad
The setting so that guided wave bar suspends in crimp body is enclosed, crimp body has been isolated and generating to sonic probe for external generation is interfered
Signal, guarantee test device transmission performance stablize so that test result is more accurate；On the other hand, all sound waves
Probe is arranged in the inner cavity of guided wave bar, not only it is possible to prevente effectively from external irrelevant signal interference, greatly improves sound emission letter
Number signal-to-noise ratio, it can also be protected, extend the service life of sonic probe.It has for one kind of sonic probe arrangement
Benefit is attempted.
And during the test of rock mechanics, while needing to control the conditions such as the temperature of test specimen, pressure on stratum
Under the conditions of, the test data that can carry out scientific research or Instructing manufacture can be just obtained in this way, so the temperature of test specimen is must
The parameter that must be monitored needs for temperature probe to be inserted into rock sample to truly measure the real time temperature of test specimen
Portion.
Summary of the invention
The object of the present invention is to provide a kind of monitoring devices for true triaxial test, can effectively avoid external unrelated
The interference of signal guarantees the monitoring accuracy of sonic probe and temperature probe, so that the data more true and accurate obtained.
Monitoring device of the present invention for true triaxial test, including acoustic emission monitor(ing) component and temperature monitoring group
Part；The acoustic emission monitor(ing) component includes sonic probe and Acoustic radiating instrument, and sonic probe is embedded in the groove of surface of test piece, sound
The signal wire of wave probe is drawn from true triaxial charging assembly to be connect with Acoustic radiating instrument；The temperature monitoring elements include that temperature is visited
Needle and signal collecting device, the temperature probe are inserted in the installing blind of surface of test piece, be equipped in the installing blind with
The erection joint of temperature probe corresponding matching, the cable of temperature probe are drawn from true triaxial charging assembly and are set with signal acquisition
Standby connection.
Further, the true triaxial charging assembly includes autoclave body, kettle cover, load bar, load plate and is sheathed on outside test specimen
Seal rubber sleeve, the kettle cover is covered on autoclave body, and four pieces to be located at the intracorporal load plate of kettle wrong on four direction all around
Position forms the LOADED CAVITY for placing seal rubber sleeve, and the end of the load bar outside autoclave body by penetrating with load plate far from test specimen
Side is in contact.
Further, the seal rubber sleeve upper end opening, is sealed by cone seal plug, and conical seal (contact) face is equipped with multiple
Seal convexity.
Further, the signal wire of the sonic probe is drawn by the conical seal (contact) face between seal rubber sleeve and seal plug
Out, and between signal wire and conical seal (contact) face it is sealed by sealant.
Further, seal rubber sleeve position corresponding with the installing blind on test specimen is equipped with the boss towards outside,
The first through hole coaxial with installing blind is equipped in the boss, erection joint tight fit is installed on first through hole and installing blind
Interior, temperature probe passes through erection joint front end and puts in test specimen, and rear end is fixed by cutting ferrule pressure cap with erection joint.
Further, the installing blind is set on the position corresponding with load bar of test specimen end face, and the load plate is equipped with
Hold the second through-hole that the cable of temperature probe passes through, the load bar, which is equipped with, holds the third that the cable of temperature probe passes through
Through-hole, the autoclave body, which is equipped with, holds the fourth hole that the cable of temperature probe passes through.
Further, the third through-hole is L-shaped, and an opening is located on the end face that load bar is contacted with load plate, Ling Yikai
Mouth is located at load bar side wall.
Further, the fourth hole is equipped with adapter far from one end of test specimen, leads between the adapter and fourth hole
The sealing of the first sealing ring is crossed, the cable of temperature probe passes through adapter and fixes by card cap with adapter.
Further, the sonic probe includes cylinder, lid, conductive column and probe piece, the cylinder top opening, lid
It is covered on cartridge openings end, is equipped with probe piece in cylinder inside bottom surface, conductive column one end passes through lid and passes through conducting wire and probe piece
Connection, the other end are connect with signal wire.
Further, the sonic probe is placed in the groove of surface of test piece, and whole high pressure sealing glue of smearing is fixed.
Further, the lid is equipped with inwardly protruded sealing towards one end of cylinder, and the sealing side wall ring is set
There is seal groove, the second sealing ring with cylinder interior side contacts is equipped in seal groove.
Compared with prior art, the present invention has the following advantages:
1, the present invention is drawn signal wire by the method that crossing cabin is handled by the way that sonic probe to be embedded in the groove of surface of test piece
It is connect out with Acoustic radiating instrument, can directly monitor the signal intensity of surface of test piece, signal transmitting is strong, and eliminates in due to having
Between the inaccuracy that is measured caused by medium indirectly.
2, the present invention is by the way that temperature probe to be inserted in the installing blind of surface of test piece, and the cable of temperature probe is from true
It draws in three axis charging assemblies and is connect with signal collecting device, temperature probe is not interfered by rock deformation, continue steady
Surely test specimen internal temperature is measured, and does not influence the load of load during test, high reliablity.
3, the present invention is by the way that the signal wire of appearance sonic probe and the cable of temperature probe are arranged in true triaxial charging assembly
The space of extraction enables sonic probe and temperature probe to be adjacent to test specimen setting, ensure that sonic probe and temperature probe
Monitoring accuracy so that the data more true and accurate obtained, more really and accurately instruct by laboratory test it is live into
Row pressure break and fractuer direction control, play very important effect for the volume increase of Practical Project.
4, the probe piece of sonic probe of the invention is set to cylinder inside bottom surface, in conjunction with the setting of cylinder and lid, so that
Can be high pressure resistant after sonic probe overall package, to guarantee still meet the requirement of Experimental on acoustic emission under high pressure, hot environment.
5, sonic probe of the invention is directly embedded in the groove of surface of test piece, is arranged in load without others
Pressing device in bar or load plate, correspondingly for the arrangement of temperature probe, there are enough fixations in load bar or load plate
Space, enable sonic probe and temperature probe simultaneously reasonable Arrangement in surface of test piece.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the arrangement schematic diagram of sonic probe of the invention；
Fig. 3 is the extraction schematic diagram of the signal wire of sonic probe of the invention；
Fig. 4 is the structural schematic diagram of sonic probe of the invention；
Fig. 5 is the arrangement schematic diagram of temperature probe of the invention；
Fig. 6 is the connection schematic diagram of autoclave body and temperature probe of the invention；
Fig. 7 is the connection schematic diagram of temperature probe and test specimen of the invention.
In figure, 1-test specimen, 100-grooves, 200-installing blinds, 2-sonic probes, 21-cylinders, 22-lids,
23-conductive columns, 24-probe pieces, 25-sealings, the 26-the second sealing ring, the 27-the first bolt, 28-nuts, 29-absolutely
Edge gasket, 3-signal wires, 4-temperature probes, 5-seal rubber sleeves, 51-boss, 52-first through hole, 6-seal plugs,
7-autoclave bodies, 71-inboard seals, 72-outer seals, 73-fourth holes, 8-kettle covers, the 81-the second bolt, 9-add
Load bar, 91-third through-holes, 10-load plates, the 101-the second through-hole, 11-support bases, 12-sealants, 13-installations connect
Head, 14-cutting ferrule pressure caps, 15-adapters, the 16-the first sealing ring, 17-card caps.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
Referring to Fig. 1, shown in be used for the monitoring device of true triaxial test, including acoustic emission monitor(ing) component and temperature monitoring group
Part.Charging assembly for true triaxial test includes autoclave body 7, kettle cover 8, load bar 9, load plate 10, support base 11 and is sheathed on
Seal rubber sleeve 5 outside test specimen 1, the kettle cover 8 are covered on autoclave body 7, and four pieces of load plates 10 being located in autoclave body 7 are on a front and back left side
Dislocation forms the LOADED CAVITY for placing seal rubber sleeve 5 on right four direction, which is fixed on support base 11, described to add
The end for carrying bar 9 is in contact with load plate 10 far from the side of test specimen 1 by penetrating outside autoclave body 7.It opens 5 upper end of seal rubber sleeve
Mouthful, it is sealed by cone seal plug 6, conical seal (contact) face is equipped with multiple seal convexities.Seal plug 6 and seal rubber sleeve 5
Installation is with excessive cooperation is combined into, so that the two connection is compact, face is close with face contact, and sealing effect is good.
Referring to figs. 2 and 3, the acoustic emission monitor(ing) component includes sonic probe 2 and Acoustic radiating instrument, and sonic probe 2 is embedded
In the groove 100 on 1 surface of test specimen, the signal wire 3 of sonic probe 2 is drawn from true triaxial charging assembly to be connected with Acoustic radiating instrument
Connect, it is existing common monitoring device that Acoustic radiating instrument, which is being not shown in the figure, the present invention to its structure and working principle no longer into
Row repeats.
Signal wire 3 is drawn by the method that crossing cabin is handled, and the signal wire 3 of the sonic probe 2 passes through seal rubber sleeve 5) it is close
Conical seal (contact) face between block head 6 is drawn, and is sealed between signal wire 3 and conical seal (contact) face by sealant 12, so that
Signal wire 3 and the mutually fastening of seal plug 6 reach sealing effect.
Referring to fig. 4, the sonic probe 2 includes cylinder 21, lid 22, conductive column 23 and probe piece 24, the cylinder 21
Top end opening, lid 22 are covered on 21 open end of cylinder, are equipped with probe piece 24 in 21 inside bottom surface of cylinder, 23 one end of conductive column is worn
It crosses lid 22 and is connect by conducting wire with probe piece 24, the other end is welded with the signal wire 3 of sonic probe 2, uses at pad
High pressure resistant colloid sealing, prevents the exposed appearance for leading to electric conduction phenomena.The lid 22 is equipped with inside towards one end of cylinder 21
The sealing 25 of protrusion, 25 side wall ring of sealing are equipped with seal groove, are equipped in seal groove and are in close contact on the inside of cylinder 21
The second sealing ring 26.
When specific assembling, the installation of conductive column 23 is carried out first, and conductive column 23 is tapered, and small head end passes through lid 22 and spiral shell
Mother 28 is cooperatively connected, and end is connected by conducting wire with the probe piece 24 for being fixed on 21 inside bottom surface of cylinder, nut 28 and lid 22
Between be equipped with insulation spacer 29, the contact surface of conductive column 23 and lid 22 is equipped with insulated enclosure component.Then conductive column will be had
23 lid 22 is covered on the open end of cylinder 21, and the sealing 25 of lid 22 is extend into cylinder 21, and on sealing 25
Two sealing rings 26 are close to 21 inner sidewall of cylinder, then pass through the mounting hole on lid 22 and cylinder 21 using the first bolt 27 and cooperate
The assembling of sonic probe 2 is completed in connection.The sonic probe 2 can still meet wanting for Experimental on acoustic emission under high pressure, hot environment
It asks, use process is reliable and stable, ensure that the authenticity and accuracy of test data.
The installation process of sonic probe 2 are as follows: be placed in sonic probe 2 in the groove 100 on 1 surface of test specimen, then in sound
High pressure sealing glue is perfused between 100 side wall of cylinder 21 and groove of wave probe 2, realizes the fixation of sonic probe 2, then by installation position
1 outer surface of test specimen at the place of setting polishes flat, and without other pressing devices, sonic probe 2 contacts well, accordingly with test specimen 1
It is stayed it is not necessary that compression module is arranged in the load plate of true triaxial charging assembly or load bar for the crossing cabin fixation of temperature probe 4 on ground
Under enough installation spaces.
The temperature monitoring elements include temperature probe 4 and signal collecting device, and the temperature probe 4 is outer diameter 2mm's
Armouring flexible structure, temperature measuring point are cable in sheathed structure end, the sheathed structure other end, and cable is installed to signal and is adopted
Collect in equipment, the temperature of temperature measuring point position can be obtained.4 sheathed structure end of temperature probe is inserted in 1 end face center of test specimen
In installing blind 200, referring to Fig. 7, the erection joint 13 with 4 corresponding matching of temperature probe, peace are equipped in the installing blind 200
Joint 13 is equipped with cutting ferrule pressure cap 14 far from one end of test specimen 1, and the cable of temperature probe 4 is drawn from true triaxial charging assembly
It is connect with signal collecting device.
The seal rubber sleeve 5 position corresponding with the installing blind 200 on test specimen 1 is equipped with the boss 51 towards outside,
The first through hole 52 coaxial with installing blind 200 is equipped in the boss 51,13 tight fit of erection joint is installed on first through hole
52 and installing blind 200 in, temperature probe pass through 13 front end of erection joint put in test specimen 1, rear end by cutting ferrule pressure cap 14 with
Erection joint 13 is fixed.The diameter of the first through hole 52 is less than the diameter of erection joint 13, passes through the bullet of seal rubber sleeve 5 itself
Property, realize the sealing of erection joint 13.
The load plate 10, which is equipped with, holds the second through-hole 101 that the cable of temperature probe 4 passes through, on the load bar 9
Equipped with the third through-hole 91 that the cable for holding temperature probe 4 passes through, the third through-hole 91 is L-shaped, and an opening is located at load bar
On 9 end faces contacted with load plate 10, another opening is located at 9 side wall of load bar.The autoclave body 7, which is equipped with, holds temperature probe 4
The fourth hole 73 that cable passes through, the fourth hole 73 far from test specimen 1 one end be equipped with adapter 15, the adapter 15 with
It is sealed between fourth hole 73 by the first sealing ring 16, the cable of temperature probe 4 passes through adapter 15 and passes through card cap 17
It is fixed with adapter 15.
Temperature probe 4 is installed using crossing cabin method, and the crossing cabin method refers to by temperature probe 4 on the outside of autoclave body 7,
Autoclave body 7, load bar 9, load plate 10 and seal rubber sleeve 5 are sequentially passed through, installing blind 200 of the test specimen 1 for thermometric is finally reached
Interior method.Concrete operations are: adapter 15 being screwed on the fourth hole 73 of autoclave body 7 first, passes through the first sealing
Circle is sealed, and adapter 15 is located at the one end of fourth hole 73 far from test specimen 1, and the armouring of temperature probe 4 is partially passed through and is turned
Connector 15 and autoclave body 7 are fixed and are sealed using card cap 17.Armouring part across the temperature probe 4 of autoclave body 7 sequentially passes through
Centre bore on the second through-hole 101 and erection joint 13 on L shape third through-hole 91, load plate 10 on load bar 9 reaches examination
Temperature probe 4 is fixedly mounted in erection joint 13 by the bottom of the installing blind 200 on part 1 using cutting ferrule pressure cap 14
Realize the temperature measurement inside test specimen.Temperature probe 4 is fixedly mounted using the crossing cabin method, temperature probe 4 is effectively prevented and exists
It is interfered during test by rock deformation, can sustainedly and stably measure 1 internal temperature of test specimen, and do not influence lotus during test
The load of load, high reliablity.
Claims (10)
1. a kind of monitoring device for true triaxial test, it is characterised in that: including acoustic emission monitor(ing) component and temperature monitoring group
Part；
The acoustic emission monitor(ing) component includes sonic probe (2) and Acoustic radiating instrument, and sonic probe (2) is embedded in test specimen (1) surface
Groove (100) it is inner, the signal wire (3) of sonic probe (2) is drawn from true triaxial charging assembly and is connect with Acoustic radiating instrument；
The temperature monitoring elements include temperature probe (4) and signal collecting device, and the temperature probe (4) is inserted in test specimen
(1) installation with temperature probe (4) corresponding matching is equipped in the installing blind (200) on surface, in the installing blind (200) to connect
Head (13), the cable of temperature probe (4) are drawn from true triaxial charging assembly and are connect with signal collecting device.
2. the monitoring device according to claim 1 for true triaxial test, it is characterised in that: the true triaxial load group
Part includes autoclave body (7), kettle cover (8), load bar (9), load plate (10) and is sheathed on the external seal rubber sleeve (5) of test specimen (1), institute
It states kettle cover (8) to be covered on autoclave body (7), four pieces of load plates (10) being located in autoclave body (7) are wrong on four direction all around
Position forms the LOADED CAVITY for placing seal rubber sleeve (5), and the end of the load bar (9) is penetrated outside by autoclave body (7) and load plate
(10) side far from test specimen (1) is in contact.
3. the monitoring device according to claim 2 for true triaxial test, it is characterised in that: the seal rubber sleeve (5)
Upper end opening is sealed by cone seal plug (6), and conical seal (contact) face is equipped with multiple seal convexities.
4. the monitoring device according to claim 3 for true triaxial test, it is characterised in that: the sonic probe (2)
Signal wire (3) drawn by conical seal (contact) face between seal rubber sleeve (5) and seal plug (6), and signal wire (3) with bore
It is sealed between shape sealing surface by sealant (12).
5. the monitoring device according to claim 2 for true triaxial test, it is characterised in that: the seal rubber sleeve (5)
Position corresponding with installing blind (200) on test specimen (1) is equipped with the boss (51) towards outside, sets in the boss (51)
There is the first through hole (52) coaxial with installing blind (200), erection joint (13) tight fit is installed on first through hole (52) and peace
It fills in blind hole (200), temperature probe passes through erection joint (13) front end and puts in test specimen (1), and rear end passes through cutting ferrule pressure cap (14)
It is fixed with erection joint (13).
6. the monitoring device according to claim 2 for true triaxial test, it is characterised in that: the installing blind
(200) it is set on the position corresponding with load bar of test specimen (1) end face, the load plate (10), which is equipped with, holds temperature probe (4)
The second through-hole (101) that cable passes through, the load bar (9), which is equipped with, holds the third that the cable of temperature probe (4) passes through
Through-hole (91), the autoclave body (7), which is equipped with, holds the fourth hole (73) that the cable of temperature probe (4) passes through.
7. the monitoring device according to claim 6 for true triaxial test, it is characterised in that: the third through-hole (91)
L-shaped, an opening is located on the end face that load bar (9) are contacted with load plate (10), and another opening is located at load bar (9) side wall.
8. the monitoring device according to claim 6 for true triaxial test, it is characterised in that: the fourth hole (73)
One end far from test specimen (1) is equipped with adapter (15), passes through the first sealing ring between the adapter (15) and fourth hole (73)
(16) it seals, the cable of temperature probe (4) passes through adapter (15) and fixed by card cap (17) and adapter (15).
9. the monitoring device according to claim 1 or 2 for true triaxial test, it is characterised in that: the sonic probe
It (2) include cylinder (21), lid (22), conductive column (23) and probe piece (24), cylinder (21) top end opening, lid (22)
It is covered on cylinder (21) open end, is equipped with probe piece (24) in cylinder (21) inside bottom surface, conductive column (23) one end passes through lid
Body (22) is connect by conducting wire with probe piece (24), and the other end is connect with signal wire (3).
10. the monitoring device according to claim 9 for true triaxial test, it is characterised in that: lid (22) court
Inwardly protruded sealing (25) are equipped with to one end of cylinder (21), sealing (25) side wall ring is equipped with seal groove, sealing
The second sealing ring (26) with cylinder (21) interior side contacts is equipped in slot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910468247.9A CN110044709A (en) | 2019-05-31 | 2019-05-31 | A kind of monitoring device for true triaxial test |
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Cited By (4)
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| CN112985982A (en) * | 2021-02-26 | 2021-06-18 | 中国矿业大学 | Electrical method monitoring device suitable for true triaxial loading and use method thereof |
| CN113236240A (en) * | 2021-05-27 | 2021-08-10 | 新疆正通石油天然气股份有限公司 | High-temperature temporary blocking steering indoor true triaxial physical model experiment equipment and method |
| CN115655905A (en) * | 2022-12-13 | 2023-01-31 | 北京科技大学 | True triaxial loading device and rock mechanical property and damage directivity testing method |
| CN116148075A (en) * | 2022-12-23 | 2023-05-23 | 平顶山天安煤业股份有限公司 | High-stress soft rock stratum deformation simulation test method under mining stress |
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| CN115655905A (en) * | 2022-12-13 | 2023-01-31 | 北京科技大学 | True triaxial loading device and rock mechanical property and damage directivity testing method |
| CN116148075A (en) * | 2022-12-23 | 2023-05-23 | 平顶山天安煤业股份有限公司 | High-stress soft rock stratum deformation simulation test method under mining stress |
| CN116148075B (en) * | 2022-12-23 | 2023-09-12 | 平顶山天安煤业股份有限公司 | High-stress soft rock stratum deformation simulation test method under mining stress |
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Application publication date: 20190723 |