CN104713788B - Strain-control type tension-shearing direct shear apparatus - Google Patents
Strain-control type tension-shearing direct shear apparatus Download PDFInfo
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- CN104713788B CN104713788B CN201510141854.6A CN201510141854A CN104713788B CN 104713788 B CN104713788 B CN 104713788B CN 201510141854 A CN201510141854 A CN 201510141854A CN 104713788 B CN104713788 B CN 104713788B
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Abstract
The invention particularly provides a strain-control type tension-shearing direct shear apparatus. The strain-control type tension-shearing direcot shear apparatus comprises a base and a bracket, wherein the base is provided with a horizontal-force applying device, a measuring device, an upper shearing box and a lower shearing box; the bracket is provided with an axial-tension loading device; the horizontal-force applying device consists of a pushing seat, a speed changing box, a sliding frame II, a force-measuring ring bearing, a force-measuring ring part and a locking nut; the measuring device comprises a force measuring ring, a horizontal displacement meter and a vertical displacement meter; and the axial-tension loading device mainly comprises a pneumatic control adjusting device, an air-pressure chamber, a force transferring rod, a piston and a connecting seat. The strain-control type tension-shearing direct shear apparatus provided by the invention has the advantages that the modes of electric-control horizontal loading and axial loading of the air-pressure transferring force are adopted; by a horizontal-force applying device, the measuring device and the axial-tension loading device, stable-force application on a test sample is realized; and the structure is simple, the operation is convenient, the control is stable and the data is reliable.
Description
Technical field
The present invention relates to the experimental rig that a kind of soil shear strength is determined, and in particular to a kind of strain controlling formula is drawn and cuts straight
Cut instrument.
Background technology
The research of lot of experiments and wprks example shows that the failure mode of soil is mainly failure by shear, i.e., native is strong
The shear stress that degree is insufficiently resistant in certain one side is acted on and caused, and shearing strength is always most important research class in rock-soil mechanics
One of topic, and failure by shear is the reason for causing most Geotechnical Engineering unstabilitys, the shearing strength ginseng of Accurate Determining Rock And Soil
Number is significant in Geotechnical Engineering is built.
At present, conventional shear strength parameter assay method has triaxial test and direct shear test, wherein, direct shear test due to
Its is easy to operate, applied widely and application is the most universal；It is with Coulomb theory develop as theoretical foundation, most
Test method that is early and most directly determining Rock And Soil shearing strength.Direct shear test can be divided into Stress Control formula and strain controlling formula two
Kind, Stress Control formula direct shear test is that soil sample is fitted in shear box, while applying pressure at right angle to soil sample by increased pressure board
Constant horizontal shear force is applied to sample, its relevant shear displacement is determined, for the long-term strength that creep test determines soil.Should
Becoming control formula direct shear test is sheared by constant rate of speed while pressure at right angle is applied to soil sample, determines its corresponding level
Shear stress, for determining the conventional magnetic shear intensity of soil.
Research shows that the excavation off-load of slope soil and Rock And Soil causes the top soil body Tension Stress Zone in a big way occur
Domain, the region soil body is often in not only tension but also composite stress state is cut in the drawing cut.Existing achievement in research shows that linear pattern is strong
Degree criterion can not preferably reflect soil body strength characteristics in the case where composite stress state is cut in drawing, for this reason, it is necessary to studying tension cuts multiple
The shearing strength of the combined stress region soil body.Due to due to traditional experimental technique, soil body drawing is carried out indoors using direct shear apparatus
The experimental study of shear stress strength is very difficult, it is difficult to realize, so far, soil body mechanical property under relevant tension-shear tests state
Achievement in research it is few in number.
Most direct shear apparatus is not directly measured shear displacemant device in addition to it can only implement axial compressive force, but logical
The revolution of overwriting handwheel calculates shear displacemant with the reading of ring of measuring one's own ability, and sometimes handwheel rotating speed is too fast, easily causes reading
Error, also increased the workload of experimenter.
For above-mentioned deficiency, a kind of strain controlling formula drawing need to be explored and cut direct shear apparatus, it is axially loaded straight as pulling force to realize
Scissor test, determines to draw and cuts the shearing strength of the region soil body, and requires the stable direct shear apparatus control performance, working specification, measurement side
Just.
The content of the invention
It is an object of the invention to provide a kind of control performance is stable, working specification, measure convenient strain controlling formula
Direct shear apparatus is cut in drawing, to realize the axially loaded direct shear test as pulling force, determines the shearing strength of the La Jian areas soil body.
The technical scheme is that a kind of strain controlling formula of offer is drawn and cut direct shear apparatus, including base and be fixed on base
Support, be from left to right installed with pusher seat, slider bar two, collar bearing of measuring one's own ability, ring component of measuring one's own ability on the base successively
And locking nut；Gearbox is installed with the pusher seat bearing, the pusher seat side is equipped with handwheel, and opposite side is fixed
One latch frame is installed, pusher seat upper end is provided with a latch one, and the slider bar two is provided with down at the axle center of upper surface
Shear box, the pusher seat front end of the pusher seat contacts with down cut box, and on the down cut box shear box is provided with, described
Upper shear box forms the overall shear box for accommodating sample with down cut box, and the upper shear box front end is provided with front end steel ball, institute
State front end steel ball to contact with collar bearing of measuring one's own ability, the side of the collar bearing of measuring one's own ability is fixed with displacement meter base, the displacement meter bottom
Horizontal displacement meter is installed with seat.
Two crossbeams are installed with the middle of the support, between two crossbeams are arranged on identical height and have between the two
Every, air-pressure chamber is installed by bolt on described two crossbeams, piston, the piston center are provided with the air-pressure chamber
Connection transmission rod, the transmission rod is passed through from the air-pressure chamber base of air-pressure chamber with the interval center in the middle of two crossbeams, the biography
Power bar lower end is provided with circular hole, and the upper shear box upper end is fixedly connected with connecting seat, the connecting seat inner bottom surface by latch two
It is fixedly connected with sample, the connecting seat upper end is provided with circular hole, the transmission rod is connected by screw rod with connecting seat, the biography
The circular hole of power bar and the circular hole centering of connecting seat, the connecting seat upper surface is provided with vertical displacement meter.
The side lower part of the air-pressure chamber one is provided with air inlet, and air pressure control and regulation device, institute are installed with the crossbeam
State air pressure control and regulation device one end to be connected with air inlet, the other end is connected with laboratory atmosphere source.
Slider bar one is installed with by fixing bolt on above-mentioned base, support is installed in slider bar one.
The roller bearing of row's ball composition is embedded with above-mentioned slider bar one.
Regulating bolt is provided with above-mentioned transmission rod.
Above-mentioned connecting seat is made up of lucite, and thereon there is triangular groove centre of surface position, and groove both sides have two
The projection of screw is provided with, connecting seat is internally provided with multiple osculums.
Sealing rubber ring one is provided between above-mentioned air inlet and air-pressure chamber side wall.
Sealing rubber ring two is provided between above-mentioned transmission rod and air-pressure chamber base.
Above-mentioned connecting seat inner bottom surface and down cut box inner surface are by chemical bond agent and the gluing connection of sample.
, using deformation dial gauge, range is 10mm, scale division value 0.01mm for above-mentioned horizontal displacement meter and vertical displacement meter.
Above-mentioned air-pressure chamber is made up of lucite.
Beneficial effects of the present invention：
(1) this strain controlling formula drawing that the present invention is provided is cut direct shear apparatus and carries out axial drawing by the way of air pressure transmission power
The applying of power, preferably realizes the direct shear test that xial feed is pulling force, improves the precision of test；
(2) present invention provide this strain controlling formula draw cut direct shear apparatus by axial loading device be arranged on slider bar on
Reduce frictional force so that axial loading device is moved in shear history with moving horizontally for sample, solves process of the test
In axially loaded eccentric problem；
(3) this strain controlling formula drawing that the present invention is provided is cut direct shear apparatus and increased shear displacemant measurement apparatus, it is to avoid
Shear displacemant is calculated by handwheel revolution, easy to operate with simple structure, control is stable, the features such as data are reliable.
The present invention is described in further details below with reference to accompanying drawing.
Description of the drawings
Fig. 1 is that strain controlling formula of the present invention draws the structural representation for cutting direct shear apparatus；
Fig. 2 is that strain controlling formula of the present invention draws the structural representation for cutting direct shear apparatus axial loading device；
Fig. 3 is that present invention dress sample is finished and shear displacemant meter and the structural representation after vertical displacement meter installation；
Fig. 4 is charger and the shear box connection diagram for fixedly mounting sample in the present invention；
Fig. 5 is the top view of slider bar in the present invention；
Fig. 6 is the structural representation of connecting seat in the present invention；
Fig. 7 is the structural representation of transmission rod and connecting seat connected mode in the present invention.
Description of reference numerals：1st, base；2nd, pusher seat；3rd, handwheel；4th, air inlet；5th, sealing rubber ring one；6th, rubber is sealed
Cushion rubber two；7th, bolt；8th, air-pressure chamber base；9th, screw rod；10th, vertical displacement meter；11st, latch one；12nd, gearbox；13rd, latch
Frame；14th, pusher seat front end；15th, air pressure control and regulation device；16th, air-pressure chamber；17th, transmission rod；18th, piston；19th, support；20、
Crossbeam；21st, connecting seat；22nd, latch two；23rd, upper shear box；24th, measure one's own ability collar bearing；25th, measure one's own ability ring component；26th, locking screw
It is female；27th, slider bar one；28th, ball；29th, slider bar two；30th, sample；31st, down cut box；32nd, fixing bolt；33rd, osculum；
34th, regulating bolt；35th, steel ball；36th, horizontal displacement meter；37th, displacement meter base.
Specific embodiment
Embodiment 1：
In order to determine the shearing strength of the La Jian areas soil body, the axially loaded direct shear test for pulling force is realized, the present embodiment is carried
Supply a kind of strain controlling formula as shown in Figure 1, Figure 2, Figure 3 and Figure 4 to draw and cut direct shear apparatus, including base 1 and be fixed on base 1
Support 19, be from left to right installed with successively on the base 1 pusher seat 2, slider bar 2 29, collar bearing 24 of measuring one's own ability, amount
Power ring component 25 and locking nut 26；Gearbox 12, the pusher seat 2 are installed with the bearing of the side of the pusher seat 2
Side is equipped with handwheel 3, and a latch frame 13 is installed between pusher seat 2 and gearbox 12, and the upper end of pusher seat 2 is provided with
One latch 1, the slider bar 2 29 is provided with down cut box 31 at the axle center of upper surface, before the pusher seat of the pusher seat 2
End 14 contacts with down cut box 31, and shear box 23, the upper shear box 23 and down cut are provided with the down cut box 31
Box 31 forms the overall shear box for accommodating sample 30, and the front end of upper shear box 23 is provided with front end steel ball 35, the front end steel
Pearl 35 contacts with collar bearing 24 of measuring one's own ability, and the side for measuring one's own ability collar bearing 24 is fixed with displacement meter base 37, the displacement meter bottom
Horizontal displacement meter 36 is installed with seat 37.
It is installed with two crossbeams 20 in the middle of the support 19, two crossbeams 20 are arranged on identical height and both it
Between have interval, on described two crossbeams 20 by bolt 7 install air-pressure chamber 16, piston 18, institute are provided with the air-pressure chamber 16
State the lower end center of piston 18 connection transmission rod 17, air-pressure chamber base 8 and two crossbeams of the transmission rod 17 from air-pressure chamber 16
Interval center in the middle of 20 passes through, and the lower end of the transmission rod 17 is provided with circular hole, and the upper end of upper shear box 23 passes through latch 2 22
Connecting seat 21 is fixedly connected with, the inner bottom surface of the connecting seat 21 is fixedly connected with sample 30, the upper end of the connecting seat 21 is provided with
Circular hole, the transmission rod 17 is connected by screw rod 9 with connecting seat 21, the circular hole of the transmission rod 17 and the circular hole pair of connecting seat 21
In, the upper surface of the connecting seat 21 is provided with vertical displacement meter 10.
The side lower part of the air-pressure chamber 16 1 is provided with air inlet 4, and air pressure control and regulation dress is installed with the crossbeam 20
15 are put, described air pressure control and regulation one end of device 15 is connected with air inlet 4, and the other end is connected with laboratory atmosphere source.
The axially loaded direct shear test process for pulling force of the present invention is as follows：Force mode, air pressure control are transmitted using air pressure
The one end of adjusting means 15 is connected with laboratory atmosphere source, and the other end is connected with the air inlet 4 of the side of air-pressure chamber 16, by air inlet
Mouth 4 is filled with confined pressure gas to the inside of air-pressure chamber 16, promotes piston 18 to move upwards by air pressure, and drives transmission rod 17 upwards
Motion, is connected connecting seat 21 with transmission rod 17 by screw rod 9, and the motion of transmission rod 17 has driven connecting seat 21, so as to examination
Sample 30 applies axial tension, applies different size of air pressure and controls constant by adjusting air pressure control and regulation device 15.
Embodiment 2：
On the basis of embodiment 1, as shown in figure 5, being installed with slider bar by fixing bolt 32 on the base 1
One 27, support 19 is installed in slider bar 1, and the roller bearing of the composition of row's ball 28, slider bar one are embedded with slider bar 1
27 serve not only as the workbench of axial loading device, but also provide roller bearing to reduce between support 19 and slider bar 1
Frictional force so that axial loading device is moved in shear history with moving horizontally for sample 30, it is to avoid in process of the test
Axially loaded bias.
As shown in fig. 6, the connecting seat 21 is made up of lucite, thereon there is triangular groove centre of surface position, recessed
There are two projections for being provided with screw groove both sides, and connecting seat 21 is internally provided with multiple osculums 33, for draining in shear history.
As shown in fig. 7, being provided with regulating bolt 34 on the transmission rod 17, regulating bolt 34 adjusts the height of transmission rod 17
Degree, the connection being easy between transmission rod 17 and connecting seat 21.
In order to ensure the good seal of air-pressure chamber 16, between the air inlet 4 and the side wall of air-pressure chamber 16 caulking gum is provided with
1 are enclosed, sealing rubber ring 26 is provided between the transmission rod 17 and air-pressure chamber base 8.
The inner bottom surface of the connecting seat 21 and the inner surface of down cut box 31 pass through chemical bond agent and the gluing connection of sample 30,
, using deformation dial gauge, range is 10mm, scale division value 0.01mm, the gas for the horizontal displacement meter 36 and vertical displacement meter 10
Pressure chamber 16 is made up of lucite.
When using, the concrete installation and the course of work of the present invention is as follows：
（1）It is prepared by sample
Undisturbed sample is cut from undisturbed soil sample with cutting ring or the disturbance soil sample of given dry density and moisture content is prepared.
（2）Sample is installed
The insertion pusher seat 2 of latch 1 upper end, shear box 23, down cut box 31 on alignment are inserted latch 2 22, will be filled
There is the cutting ring flat mouth of sample 30 downwards, then sample 30 is pushed upper shear box 23 and cut with by 23 mouthfuls of shear box on alignment slowly
Cut in the overall shear box of the formation of box 31, cutting ring is removed in the inner bottom surface uniform application chemical bond agent of down cut box 31, treats sample 30
Connect with the inner bottom surface of down cut box 31, then the connecting seat 21 that lower surface is smeared into evening chemical cementing agent is bonding with sample 30
And a period of time is stood, vertical displacement meter 10 is arranged on into the upper surface of connecting seat 21.
（3）Adjustment instrument
Manual adjusting handle 3, contact pusher seat front end 14 and down cut box 31, the front end steel ball 35 of upper shear box 23 just
Collar bearing 24 is contacted with measuring one's own ability, and adjusts horizontal displacement meter 36, and the pointer for making horizontal displacement meter 36 is contacted with down cut box 31, then
Adjustment horizontal displacement meter 36, measure one's own ability ring component 25 and vertical displacement meter 10, dynamometer, the horizontal displacement meter of the ring component 25 that makes to measure one's own ability
36 and the reading of vertical displacement meter 10 be all zero.
（4）The enforcement of axial force
Support 19 is arranged on and is fixedly mounted in the slider bar 1 of base both sides, select transmission rod 17 and connecting seat 21
Connected mode, adjust regulating bolt 34 to adjust the height of transmission rod 17, transmission rod 17 is fixedly connected with connecting seat 21, beat
Pneumatic supply valve is opened, constant air pressure is applied to air-pressure chamber 16 by air inlet 4 by adjusting air pressure control and regulation device 15, according to
Transmission rod 17 is driven by piston 18, pulling force is applied to sample 30 so as to pass through connecting seat 21.
（5）Sample is sheared
After applying vertical axial power, latch 1 and latch 2 22 are taken out immediately, start motor, adjust gearbox 12, with
Stable speed shearing sample, until sample 30 cuts damage, dynamometer, the and of horizontal displacement meter 36 of ring component 25 while record is measured one's own ability
The reading of vertical displacement meter 10.
（6）After off-test, air pressure is shed, removes screw rod 9, unclamp connecting seat 21 and transmission rod 17, remove support 19,
Handwheel 3 is reversed, connecting seat 21 is removed, sample 30 is taken out, shear surface soil's water content nearby is determined.
This strain controlling formula drawing that the present invention is provided is cut direct shear apparatus and transmits power with air pressure using Electronic control horizontal addload
Axially loaded mode, realize applying sample by the charger of the bringing device of horizontal force, measurement apparatus and axial tension
Plus stable power, and simple structure, easy to operate, control is stable, data reliability.
Exemplified as above is only the illustration to the present invention, does not constitute the restriction to protection scope of the present invention, all
It is that design same or analogous with the present invention is belonged within protection scope of the present invention.
Claims (10)
1. a kind of strain controlling formula is drawn and cuts direct shear apparatus, it is characterised in that：Including base (1) and the support being fixed on base (1)
(19), pusher seat (2), slider bar two (29), collar bearing of measuring one's own ability from left to right are installed with successively on the base (1)
(24), measure one's own ability ring component (25) and locking nut (26)；Gearbox (12), institute are installed with pusher seat (2) bearing
Pusher seat (2) side is stated equipped with handwheel (3), opposite side is installed with a latch frame (13), and pusher seat (2) upper end is provided with
One latch one (11), is provided with down cut box (31) at the upper surface axle center of the slider bar two (29), the pusher seat (2)
Pusher seat front end (14) contacts with down cut box (31), is provided with shear box (23) on the down cut box (31), it is described on
Shear box (23) forms the overall shear box for accommodating sample (30) with down cut box (31), and upper shear box (23) front end is arranged
There is front end steel ball (35), the front end steel ball (35) contacts with collar bearing of measuring one's own ability (24), the side of the collar bearing of measuring one's own ability (24)
Displacement meter base (37) is fixed with, on the displacement meter base (37) horizontal displacement meter (36) is installed with；
Be installed with two crossbeams (20) in the middle of the support (19), two crossbeams (20) installed in identical height and both
Between have interval, on described two crossbeams (20) by bolt (7) install air-pressure chamber (16), the air-pressure chamber (16) is inner to be provided with
Piston (18), piston (18) lower end center connection transmission rod (17), gas of the transmission rod (17) from air-pressure chamber (16)
Pressure chamber base (8) is passed through with the interval center in the middle of two crossbeams (20), and transmission rod (17) lower end is provided with circular hole, it is described on
Shear box (23) upper end is fixedly connected with connecting seat (21), connecting seat (21) inner bottom surface and sample by latch two (22)
(30) it is fixedly connected, connecting seat (21) upper end is provided with circular hole, and the transmission rod (17) is by screw rod (9) and connecting seat
(21) connection, the circular hole of the transmission rod (17) and the circular hole centering of connecting seat (21), connecting seat (21) upper surface is installed
There is vertical displacement meter (10)；
The side lower part of the air-pressure chamber (16) is provided with air inlet (4), and air pressure control and regulation are installed with the crossbeam (20)
Device (15), described air pressure control and regulation device (15) one end is connected with air inlet (4), and the other end is connected with laboratory atmosphere source
It is logical.
2. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：By solid on the base (1)
Determine bolt (32) and be installed with slider bar one (27), support (19) is installed in slider bar one (27).
3. strain controlling formula according to claim 2 is drawn and cuts direct shear apparatus, it is characterised in that：The slider bar one (27) is inner interior
It is embedded with the roller bearing of row's ball (28) composition.
4. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：Arrange on the transmission rod (17)
There is regulating bolt (34).
5. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：The connecting seat (21) is by organic
Glass is made, and thereon there is triangular groove centre of surface position, and there are two projections for being provided with screw, connecting seat (21) in groove both sides
It is internally provided with multiple osculums (33).
6. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：The air inlet (4) and air pressure
Sealing rubber ring one (5) is provided between the wall of room (16) side.
7. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：The transmission rod (17) and air pressure
Sealing rubber ring two (6) is provided between room base (8).
8. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：Connecting seat (21) inner bottom surface
With down cut box (31) inner surface by chemical bond agent and the gluing connection of sample (30).
9. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：The horizontal displacement meter (36) with
Using deformation dial gauge, range is 10mm to vertical displacement meter (10), scale division value 0.01mm.
10. strain controlling formula according to claim 1 is drawn and cuts direct shear apparatus, it is characterised in that：The air-pressure chamber (16) is by having
Machine glass is made.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510141854.6A CN104713788B (en) | 2015-03-30 | 2015-03-30 | Strain-control type tension-shearing direct shear apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510141854.6A CN104713788B (en) | 2015-03-30 | 2015-03-30 | Strain-control type tension-shearing direct shear apparatus |
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| CN104713788A CN104713788A (en) | 2015-06-17 |
| CN104713788B true CN104713788B (en) | 2017-04-19 |
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| CN201510141854.6A Active CN104713788B (en) | 2015-03-30 | 2015-03-30 | Strain-control type tension-shearing direct shear apparatus |
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| CN105004666B (en) * | 2015-06-26 | 2017-11-07 | 云南武易高速公路建设指挥部 | A kind of geosynthetics contact surface frictional strength method of testing |
| CN104931358B (en) * | 2015-06-26 | 2017-09-15 | 中国科学院地质与地球物理研究所 | A kind of large scale coarse-grained soil direct shear strength method of testing |
| CN104977216B (en) * | 2015-07-09 | 2017-07-21 | 北京神州龙鼎科技有限公司 | Direct shear apparatus in situ |
| CN105181453B (en) * | 2015-08-10 | 2018-04-10 | 中国科学院武汉岩土力学研究所 | Rock soil medium tensile-sbear strength method for testing and analyzing |
| CN105181482B (en) * | 2015-09-15 | 2018-02-27 | 中国科学院武汉岩土力学研究所 | The multi-functional shearing experiment test device of rock and its method of testing |
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| CN106053209B (en) * | 2016-07-13 | 2018-09-11 | 长江水利委员会长江科学院 | Test in Situ tensile shear testing system and method |
| CN106290005A (en) * | 2016-07-28 | 2017-01-04 | 上海市城市建设设计研究总院 | The strain direct shear apparatus such as the tetrad of air pressure-loading |
| CN107271272B (en) * | 2016-10-21 | 2019-08-09 | 中国矿业大学 | A kind of probe test device and method of pan soil intensity and structured testing |
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| CN107576580B (en) * | 2017-08-31 | 2023-12-19 | 常熟市徐润机电有限公司 | Strain control type direct shear apparatus |
| CN107515153B (en) * | 2017-08-31 | 2023-12-19 | 常熟市徐润机电有限公司 | Parallel locking device for upper shearing box |
| CN107976363B (en) * | 2017-11-27 | 2019-12-27 | 同济大学 | Sleeve type soil gripper sensor device for measuring internal micro-deformation of soil body in geotechnical direct shear test |
| CN108152151A (en) * | 2017-12-29 | 2018-06-12 | 西安长庆科技工程有限责任公司 | The unsaturated soil direct shear apparatus that a kind of Temperature Control Type is sheared repeatedly |
| CN108489827A (en) * | 2018-04-08 | 2018-09-04 | 中国矿业大学 | A kind of intelligence strain controlling formula geotechnique direct shear apparatus and data acquisition analysis method |
| CN110174319B (en) * | 2019-06-28 | 2024-09-27 | 广西科技大学 | Pseudo static force test device for cyclic shearing |
| CN110726627B (en) * | 2019-12-03 | 2024-04-12 | 安徽理工大学 | SRM driving type mining strain direct shear apparatus |
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| CN104713788A (en) | 2015-06-17 |
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