CN102507334A - Measurement mechanism for lateral deformation of pressure chamber of true triaxial apparatus - Google Patents

Measurement mechanism for lateral deformation of pressure chamber of true triaxial apparatus Download PDF

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Publication number
CN102507334A
CN102507334A CN2011103333116A CN201110333311A CN102507334A CN 102507334 A CN102507334 A CN 102507334A CN 2011103333116 A CN2011103333116 A CN 2011103333116A CN 201110333311 A CN201110333311 A CN 201110333311A CN 102507334 A CN102507334 A CN 102507334A
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CN
China
Prior art keywords
pressure chamber
lateral
pressure
guide rod
measurement
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CN2011103333116A
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Chinese (zh)
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CN102507334B (en
Inventor
邵生俊
许萍
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西安理工大学
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Publication of CN102507334B publication Critical patent/CN102507334B/en

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Abstract

The invention discloses a measurement mechanism for lateral deformation of a pressure chamber of a true triaxial apparatus. The pressure chamber of the true triaxial apparatus is formed by a pressure chamber base, pressure chamber lateral walls and a pressure chamber top cover. Four pressure cavities are symmetrically distributed in the pressure chamber, and an emulsion membrane is respectively arranged in the four pressure cavities, and four emulsion membranes are respectively connected with an external pressure source and respectively form flexible hydraulic capsules after being filled with liquid. Lateral displacement measurement guide rods are radially and horizontally arranged in the four pressure cavities in a penetrating mode. One ends of the lateral displacement measurement guide rods penetrate through the corresponding emulsion membranes to be fixedly provided with vertical inner end plates which are flushed with the outer surfaces of the flexible hydraulic capsules, the other ends of the lateral displacement measurement guide rods extend out of the pressure chamber to be respectively connected with an electronic dial indicator. The measurement mechanism for the lateral deformation of the pressure chamber of the true triaxial apparatus is suitable for the true triaxial apparatus with axial rigidity loading and lateral flexible loading, and accurate measurement on the lateral deformation through the true triaxial apparatus is achieved.

Description

The lateral deformation measurement mechanism of a kind of true triaxil tester pressure chamber
Technical field
The invention belongs to Geotechnical Engineering testing apparatus technical field, be specifically related to the lateral deformation measurement mechanism of a kind of true triaxil tester pressure chamber.
Background technology
In the Research on Mechanical Properties to soil, the traditional test instrument has direct shear apparatus, unidirectional compressometer and normal triaxial appearance etc., and since foreign scholar Kiellman successfully designed true triaxil tester first in 1936, true triaxil tester more and more came into one's own.True triaxil tester can be implemented under the complex stress condition the experimental study of the soil body, has comprehensively, reflects truly the advantages such as three-dimensional principle stress state of native unit.
Successively designed the true triaxil tester of multiple different types both at home and abroad, although mentality of designing is different, core concept all is conceived to the independent control of three principle stresses and principal strain component and measures.Cambridge true triaxil tester that the three-dimensional rigidity version of accomplishing from developings such as the Roscoe of Cambridge University loads; Three-dimensional flexible fluid loading true triaxil tester to U.S. Coloeado university and Tokyo Univ Japan's invention; Arrive Kyoto Univ Japan improved again and load to rigid plate, two to air pressure or flexible hydraulic loading true triaxil tester or the like.Such instrument development develops with aspects such as being convenient to the ess-strain measurement to the corner effects that eliminates stress just gradually.The true triaxil tester of Xi'an University of Technology's development has four chambeies, a Room, vertical rigidity loads and the flexible characteristics that load of side hydraulic capsule; Be a kind of true triaxil tester, but how realize of the effective control and accurate measure a still still difficult problem of two separate sides to deflection with novel pressure chamber load maintainer.
The measurement control of existing true triaxil tester lateral deformation is different according to the difference of its loading type.For the mechanism of three-dimensional rigid plate load mode, the measurement of sample lateral deformation is that the displacement through the lateral rigidity plate measures and realizes, controls measurement, the principle simple possible with sample compression, the inside or outside sliding distance that expands.If the distortion of sample on three principal directions of stress is monotone variation, the three-dimensional rigid plate also can dullly move and change.But if the distortion conversion that sample has compression to rise to side in a certain direction, then the rigid plate of two direction loadings is difficult in time follow in addition, and sample is extruded in edges and corners easily.Moreover, interfere with each other between this instrument three-dimensional load plate, also exist significantly not enough.For three-dimensional flexible hydraulic load mode, though improve to some extent inwardly in rigid plate, the range of strain that side direction measures is less, and is to obtain sample indirectly in the distortion of a certain direction through hydraulic pressure capsule volume variable quantity.Has limitation for the bigger clay material of distortion.Analysis based on these load modes; Existing one loads two to the flexible hydraulic loading system to rigidity; Have feasibility in theory, but in practical operation, because the hydraulic pressure capsule is inflated inevitably; And the hydraulic pressure capsule makes interior two masters of surface level have certain error to the measurement of distortion with the reason of the plane rotation of its division board.Therefore; Improve the lateral deformation measurement mechanism of true triaxial cell; Eliminate the existing measurement defective that exists, make new pressure chamber's lateral deformation measuring structure can guarantee good operating performance, the measurement that can accurately carry out lateral deformation again has actual using value.
Summary of the invention
The lateral deformation measurement mechanism that the purpose of this invention is to provide a kind of true triaxil tester pressure chamber is applicable to that longitudinal stiffness loads the true triaxil tester that lateral flexibility loads, and has realized the accurate measurement of true triaxil tester to the side direction distortion.
The technical scheme that the present invention adopted is, the lateral deformation measurement mechanism of a kind of true triaxil tester pressure chamber, and this true triaxil tester pressure chamber is made up of pressure chamber's base, pressure chamber's sidewall and pressure chamber's top cover; And inside, pressure chamber is symmetrically distributed with four pressure chambers; Respectively be provided with a latex film in four pressure chambers, four latex films are connected with external pressure source respectively, and behind topping up, form the flexible hydraulic capsule respectively; In four pressure chambers all radially and level intert and to be provided with a lateral shift and to measure guide rod; After one end of each lateral shift measurement guide rod penetrates corresponding latex film, be fixed with the inner end plate of vertical direction in its end, inner end plate is concordant with the outside surface of flexible hydraulic capsule; The other end that each lateral shift measures guide rod stretches out in the outside, pressure chamber, and its end is connected with the connection of electronics dial gauge respectively.
Pressure chamber's sidewall of true triaxil tester pressure chamber is provided with four guide cylinders, and four lateral shifts measure the equal correspondence of guide rod and intert in guide cylinder.
Each lateral shift measures guide rod and is connected and composed through screw thread is coaxial by two bodies of rod, and wherein, the connecting portion of these two bodies of rod and is provided with sealing nut at this connecting portion in pressure chamber.
Each lateral shift measures on the guide rod, between sealing nut and inner end plate, is disposed with pad and rigid seal casing.
The outer setting of this pressure chamber has electronics dial gauge fixed mount, and four electronics dial gauges are installed on the electronics dial gauge fixed mount.
Advantage of the present invention is: can realize the experimental study of sample side direction deflection under three-dimensional independent loads condition well, can measure the correlation parameter of soil deformation characteristic under the true triaxial test condition; Test findings is reliable and stable, and different soil nature comparison of test results property are strong.And the present invention is reasonable in design, use is easy and simple to handle, intelligent degree height and dependable performance.
Description of drawings
Fig. 1 is the structural representation of the lateral deformation measurement mechanism of a kind of true triaxil tester of the present invention pressure chamber;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the annexation synoptic diagram that lateral shift measures guide rod among the present invention.
Wherein, 1, pressure chamber's base; 2, pore water communicating pipe; 3, following permeable stone; 4, pressure chamber's flexible pocket division board radial motion elastic restraint mechanism; 5, flexible pocket division board in pressure chamber's rotates elastic restraint mechanism; 6, hydraulic communication pipe; 7, upper dankness stone; 8, sample top cover; 9, pressure chamber's top cover; 10, flexible hydraulic capsule; 11, pressure chamber's sidewall; 12, lateral shift measures guide rod; 13, electronics dial gauge; 14, electronics dial gauge fixed mount; 15, pressure chamber's flexible pocket division board; 16, pressure chamber; 17, latex film; 18, inner end plate; 19, rigid seal casing; 20, pad; 21, external thread; 22, guide cylinder; 23, sealing nut.
Embodiment
As shown in Figure 1; The lateral deformation measurement mechanism of a kind of true triaxil tester of the present invention pressure chamber; This pressure chamber is made up of the pressure chamber's base 1 that sets gradually from top to bottom, pressure chamber's sidewall 11 and pressure chamber's top cover 9, and the lumen centers place, pressure chamber that pressure chamber's sidewall 11 surrounds is the sample lay down location, is evenly distributed with four pressure chambers 16 around the sample lay down location; Respectively be provided with a latex film 17 in four pressure chambers 16; The hydraulic communication pipe 6 of 6, four latex films 17 of four hydraulic communication pipes through correspondence is installed on pressure chamber's sidewall 11 is connected, and behind topping up, be formed for sample is applied the T type flexible hydraulic capsule 10 of side direction normal stress with external pressure source.Be provided with pressure chamber's flexible pocket division board 15 between adjacent two pressure chambers 16, pressure chamber's flexible pocket division board 15 is the vertical plate that radially is provided with, and expandable, lateral rotation.The upper surface fluting of pressure chamber's base 1 also is provided with down permeable stone 3, also has the pore water communicating pipe 2 that communicates with following permeable stone 3 on pressure chamber's base 1.The center of pressure chamber's top cover 9 has through hole, and is provided with sample top cover 8 at tapping, and the lower surface fluting of sample top cover 8 also is provided with upper dankness stone 7.
As shown in Figure 2; In four pressure chambers 16 all radially and level intert and to be provided with a lateral shift and to measure guide rod 12; On pressure chamber's sidewall 11, have four horizontal through hole; These four horizontal through hole all are equipped with 22, four lateral shifts of a guide cylinder and measure guide rod 12 corresponding interspersed 22 li of the guide cylinders that are arranged on.
In conjunction with shown in Figure 3, four lateral shifts measure guide rod 12 by the outer section body of rod and the inner segment body of rod through the formation that is threaded.Wherein, All interspersed 22 li of the guide cylinders that are arranged on of each outer section body of rod, the connecting portion of the outer section body of rod and the inner segment body of rod is in pressure chamber 16, and an end of the outer section body of rod axially has threaded hole and the end is provided with sealing nut 23; The other end of the outer section body of rod stretches out in the outside, pressure chamber and is connected with electronics dial gauge 13; Each inner segment body of rod is positioned at pressure chamber 16, and an end of the inner segment body of rod is provided with external thread 21, and is connected with an outer section body of rod through it; After the other end of the inner segment body of rod passed latex film 17, the end was provided with the inner end plate 18 of vertical direction within it.Behind latex film 17 topping ups, inner end plate 18 is concordant with the outside surface of flexible hydraulic capsule 10.
Each lateral shift measures on the guide rod 12, between sealing nut 23 and inner end plate 18, is disposed with pad 20 and rigid seal casing 19.
The outer setting of pressure chamber has 14, four electronics dial gauges 13 of electronics dial gauge fixed mount to be installed on the electronics dial gauge fixed mount 14.
Pressure chamber flexible pocket division board radial motion elastic restraint mechanism 4 and pressure chamber's flexible pocket division board are installed outside pressure chamber's sidewall 11 rotate elastic restraint mechanism 5.Pressure chamber flexible pocket division board radial motion elastic restraint mechanism 4 influences each other for isolating adjacent two pressure chamber hydraulic pressure capsules; Sample sample generation lateral compression or when expanding, mechanism's spring can realize regulating the function of flexible hydraulic capsule division board radial expansion motion in fixed or shear history.Pressure chamber's flexible pocket division board rotates elastic restraint mechanism 5 and influences each other for isolating adjacent two pressure chamber hydraulic pressure capsules; Sample sample generation lateral compression or when expanding in fixed or shear history is provided with rotation spring and can realizes regulating the function that flexible hydraulic capsule division board freely rotates in the mechanism.These two constraint mechanisms are realized pressure chamber's flexible pocket division board 15 free radial expansion and lateral rotation, guarantee that the flexible hydraulic capsules 10 in the adjacent pressure chamber 16 do not depart from, and realize in process of the test that side direction is not disturbed mutually and load and be out of shape thereby satisfy sample.
Principle of work of the present invention is: through below pressure chamber's base 1, hydraulic cylinder being set, and through this hydraulic cylinder along vertically to sample is applied xial feed.The built-in piston of hydraulic cylinder connects external pressure source, adopts closed-loop control can guarantee load application on request.The vertical displacement sensor is set on pressure chamber's top cover 9, and this vertical displacement sensor is fixed on the rigid posts of axial nothing distortion, when axial loading, can directly measure the distortion of sample.Two relative latex films 17 of position communicate and form two side direction group of exerting pressure, and these two side direction group of exerting pressure is communicated with respectively with two external hydraulic source respectively, and it is implemented closed-loop control respectively, can apply the principle stress of both direction on the side wall surface to sample.In fixed or shear history, the sample pore water can be through permeable stone 3 and pore water communicating pipes 2 are transmitted pressure and motion, the control and the measurement of the process that makes an experiment mesoporosity water down.
It is the critical pieces that transmit sample deformation that lateral shift measures guide rod 12, and lateral shift measures guide rod 12 can realize radial motion displacement on the surface level, and itself does not deform.Lateral shift measures guide rod 12 1 ends and connects inner end plate 18, and test is initial, and inner end plate 18 should fit tightly sample, and the other end is positioned at outside pressure chamber's sidewall 11, through electronics dial gauge 13 record initial displacements.In the process of the test; Difference loading along with three directions; Sample deforms at large, medium and small principal direction of stress respectively, and flexible hydraulic capsule 10 is close to the sample sidewall, drives lateral shift and measures the motion of guide rod 12 one; The expansion of sample sidewall or contraction measure guide rod 12 through lateral shift and pass to electronics dial gauge 13, thereby realize the record of sample deformation amount.
Rigid seal casing 19, sealing nut 23 and pad 20 constitute the latex film packoff.Latex film 17 is close to the side of sample, with and be close to and all offer corresponding aperture on the side of pressure chamber's sidewall 11, lateral shift measures guide rod 12 levels and passes this two apertures, can pass latex film 17, and keeps sealing.Tighten sealing nut 23, pad 20 is exerted pressure, and transfer the pressure on the rigid seal casing 19, thereby make rigid seal casing 19 and inner end plate 18 compress latex film 17.
Electronics dial gauge 13 measures guide rod 12 outer ends with lateral shift and contacts; The sample lateral deformation drives lateral shift and measures radially displacement in the guide rod 12 occurred level faces; Lateral shift measures guide rod 12 motions and drives the motion of electronics dial gauge 13 measuring staffs, and the pointer of electronics dial gauge 13 deflects, and electronics dial gauge 13 measures electric signal through the A/D conversion; Be transferred to computer-automatic collection, thereby realize the data acquisition of lateral deformation.
The course of work of the present invention is following: at first; To be positioned at pressure chamber 16; The inner segment body of rod, rigid seal casing 19 and latex film 17 sealings that lateral shift measures guide rod 12 are mounted to one, and behind topping up, fit with the sample sidewall in flexible hydraulic capsule 10 surfaces; Rigid seal casing 19 is positioned at flexible hydraulic capsule 10, and inner end plate 18 all is fitted in same plane with flexible hydraulic capsule 10 surfaces and sample sidewall.
Secondly, with this four flexible hydraulic capsules 10 corresponding smooth put into four pressure chambers 16, the inner segment body of rod that each lateral shift is measured guide rod 12 is integral through being threaded with an outer section body of rod.Lateral shift measures the sealing between guide rod 12 and the flexible hydraulic capsule 10; Contact assurance with flexible hydraulic capsule 10 tight respectively through inner end plate 18, rigid seal casing 19, pad 20 and sealing bolt 23, make flexible hydraulic capsule 10 non-leakage under pressurized state.Pad 20 can avoid sealing bolt 23 to cause 10 breakages of flexible hydraulic capsule.
At last; Tighten sealing bolt 23; Make pad 20 and rigid seal casing 19 compress the outside film of flexible hydraulic capsule 10; Rigid seal casing 19 compresses the inner edge film of flexible hydraulic capsule 10 with inner end plate 18, thereby flexible hydraulic capsule 10 and rigid seal casing 19 are combined into one, and can make lateral shift measure guide rod 12 and be out of shape consistent with the sample sidewall.
After treating that above-mentioned installment work is carried out, the manual adjustments lateral shift measures guide rod 12 and makes inner end plate 18 tight intact applying samples, and at this moment, flexible hydraulic capsule 10, inner end plate 18 evenly are adjacent to around the sample, electronics dial gauge 13 pointer record initial displacements.In the process of the test, along with the difference loading of three directions, sample deforms at large, medium and small principal direction of stress respectively; Flexible hydraulic capsule 10 measures the motion of guide rod 12 one with lateral shift; Sample compression or the distortion of expanding measure guide rod 12 motions through lateral shift and are passed to the motion of electronics dial gauge 13 measuring staffs, and through the A/D conversion, sample lateral deformation displacement data is transferred to computing machine; Thereby the realization automatic data collection is accomplished the record of true three loading procedure sample lateral deformation amounts.
The present invention mainly is applicable to the true triaxil tester that existing longitudinal stiffness loads, lateral flexibility loads; Rock-soil material is carried out the true triaxial test research that longitudinal stiffness loads, lateral flexibility loads; Carry out the independent control and the measurement of three principle stresses and principal strain component accurately, thereby obtain the strength characteristics of research rock-soil material and the test figure of deformation characteristic.

Claims (5)

1. the lateral deformation measurement mechanism of a true triaxil tester pressure chamber; This true triaxil tester pressure chamber is made up of pressure chamber's base (1), pressure chamber's sidewall (11) and pressure chamber's top cover (9); And inside, pressure chamber is symmetrically distributed with four pressure chambers (16), respectively is provided with a latex film (17) in said four pressure chambers (16), and said four latex films (17) are connected with external pressure source respectively; And behind topping up, form flexible hydraulic capsule (10) respectively; It is characterized in that, in said four pressure chambers (16) all radially and level intert and to be provided with a lateral shift and to measure guide rod (12), after the end that said each lateral shift measures guide rod (12) penetrates corresponding latex film (17); Be fixed with the inner end plate (18) of vertical direction in its end; Said inner end plate (18) is concordant with the outside surface of flexible hydraulic capsule (10), and the other end that said each lateral shift measures guide rod (12) stretches out outside in the pressure chamber, and its end is connected with electronics dial gauge (13) connection respectively.
2. according to the lateral deformation measurement mechanism of the described true triaxil tester of claim 1 pressure chamber; It is characterized in that; Pressure chamber's sidewall (11) of said true triaxil tester pressure chamber is provided with four guide cylinders (22), and said four lateral shifts measure the equal correspondence of guide rod (12) and intert in guide cylinder (22) lining.
3. according to the lateral deformation measurement mechanism of the described true triaxil tester of claim 2 pressure chamber; It is characterized in that; Said each lateral shift measures guide rod (12) and is connected and composed through screw thread is coaxial by two bodies of rod; Wherein, the connecting portion of these two bodies of rod and is provided with sealing nut (23) at this connecting portion in pressure chamber (16).
4. according to the lateral deformation measurement mechanism of the described true triaxil tester of claim 3 pressure chamber; It is characterized in that; Said each lateral shift measures on the guide rod (12), between sealing nut (23) and inner end plate (18), is disposed with pad (20) and rigid seal casing (19).
5. according to the lateral deformation measurement mechanism of the described true triaxil tester of claim 1 pressure chamber; It is characterized in that; The outer setting of this pressure chamber has electronics dial gauge fixed mount (14), and said four electronics dial gauges (13) are installed on the electronics dial gauge fixed mount (14).
CN 201110333311 2011-10-28 2011-10-28 Measurement mechanism for lateral deformation of pressure chamber of true triaxial apparatus CN102507334B (en)

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Cited By (15)

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Publication number Priority date Publication date Assignee Title
CN103134721A (en) * 2013-02-07 2013-06-05 西安理工大学 Dynamic triaxial testing machine servo-driven by electric cylinder
CN103175728A (en) * 2013-02-07 2013-06-26 西安理工大学 Dynamic true-triaxial apparatus for soil
CN103226081A (en) * 2013-04-08 2013-07-31 西安理工大学 True triaxial apparatus of unsaturated soil
CN103353421A (en) * 2013-06-17 2013-10-16 河海大学 Lateral deformation measuring device of plane strain triaxial rheometer
CN103645096A (en) * 2013-12-25 2014-03-19 中国科学院地质与地球物理研究所 True triaxial testing machine with variable size
CN104034592A (en) * 2014-06-12 2014-09-10 黄河勘测规划设计有限公司 Rock triaxial compression test method suitable for sample preparation through drilling
CN104132850A (en) * 2014-07-30 2014-11-05 中国科学院地质与地球物理研究所 System and method for shale in-situ volume fracturing tests
CN104977217A (en) * 2015-07-16 2015-10-14 西安长庆科技工程有限责任公司 Three-axis tensile tester for soil body
CN105092384A (en) * 2015-07-22 2015-11-25 山东科技大学 System and method for flexibly loading controllable boundary based on true triaxial test
CN105651613A (en) * 2015-12-29 2016-06-08 成都皓瀚完井岩电科技有限公司 Device for measuring radial deformation of rock sample
CN105784493A (en) * 2016-04-11 2016-07-20 中南大学 Testing device for rock three-axis external pressure and hole internal hydraulic pressure coupling loading and unloading
CN106018111A (en) * 2016-07-01 2016-10-12 安徽理工大学 Lateral confining pressure adjustable rock lateral restraint expansion rate determination device
CN106289989A (en) * 2016-07-20 2017-01-04 西安理工大学 A kind of large-scale real triaxial instrument of three-dimensional independent loads
CN109341506A (en) * 2018-11-16 2019-02-15 武汉理工大学 Three direction displacement measuring device
CN110017763A (en) * 2019-04-25 2019-07-16 黄河水利委员会黄河水利科学研究院 A kind of lateral deformation measuring system of cuboid sample

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Cited By (25)

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Publication number Priority date Publication date Assignee Title
CN103175728B (en) * 2013-02-07 2015-07-29 西安理工大学 The power true triaxil tester of soil
CN103175728A (en) * 2013-02-07 2013-06-26 西安理工大学 Dynamic true-triaxial apparatus for soil
CN103134721A (en) * 2013-02-07 2013-06-05 西安理工大学 Dynamic triaxial testing machine servo-driven by electric cylinder
CN103134721B (en) * 2013-02-07 2015-04-22 西安理工大学 Dynamic triaxial testing machine servo-driven by electric cylinder
CN103226081A (en) * 2013-04-08 2013-07-31 西安理工大学 True triaxial apparatus of unsaturated soil
CN103353421A (en) * 2013-06-17 2013-10-16 河海大学 Lateral deformation measuring device of plane strain triaxial rheometer
CN103353421B (en) * 2013-06-17 2015-11-18 河海大学 A kind of lateral deformation measuring device of plane strain triaxial rheometer
CN103645096A (en) * 2013-12-25 2014-03-19 中国科学院地质与地球物理研究所 True triaxial testing machine with variable size
CN103645096B (en) * 2013-12-25 2016-04-06 中国科学院地质与地球物理研究所 Variable-sized true triaxial test machine
CN104034592A (en) * 2014-06-12 2014-09-10 黄河勘测规划设计有限公司 Rock triaxial compression test method suitable for sample preparation through drilling
CN104132850B (en) * 2014-07-30 2017-02-08 中国科学院地质与地球物理研究所 System for shale in-situ volume fracturing tests
CN104132850A (en) * 2014-07-30 2014-11-05 中国科学院地质与地球物理研究所 System and method for shale in-situ volume fracturing tests
CN104977217B (en) * 2015-07-16 2018-04-06 西安长庆科技工程有限责任公司 A kind of soil body triaxial extension test instrument
CN104977217A (en) * 2015-07-16 2015-10-14 西安长庆科技工程有限责任公司 Three-axis tensile tester for soil body
CN105092384B (en) * 2015-07-22 2017-09-15 山东科技大学 The flexible loading system and method for controllable boundary based on true triaxial test
CN105092384A (en) * 2015-07-22 2015-11-25 山东科技大学 System and method for flexibly loading controllable boundary based on true triaxial test
CN105651613A (en) * 2015-12-29 2016-06-08 成都皓瀚完井岩电科技有限公司 Device for measuring radial deformation of rock sample
CN105784493A (en) * 2016-04-11 2016-07-20 中南大学 Testing device for rock three-axis external pressure and hole internal hydraulic pressure coupling loading and unloading
CN105784493B (en) * 2016-04-11 2018-06-29 中南大学 Hydraulic coupling adds unloader test device in three axis external pressure of rock and hole
CN106018111A (en) * 2016-07-01 2016-10-12 安徽理工大学 Lateral confining pressure adjustable rock lateral restraint expansion rate determination device
CN106289989A (en) * 2016-07-20 2017-01-04 西安理工大学 A kind of large-scale real triaxial instrument of three-dimensional independent loads
CN109341506A (en) * 2018-11-16 2019-02-15 武汉理工大学 Three direction displacement measuring device
CN109341506B (en) * 2018-11-16 2020-01-14 武汉理工大学 Three-dimensional displacement measuring device
CN110017763A (en) * 2019-04-25 2019-07-16 黄河水利委员会黄河水利科学研究院 A kind of lateral deformation measuring system of cuboid sample
CN110017763B (en) * 2019-04-25 2021-04-09 黄河水利委员会黄河水利科学研究院 Lateral deformation measurement system of cuboid sample

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