CN114002095A - Geotechnical test pressurizing device and experimental method - Google Patents
Geotechnical test pressurizing device and experimental method Download PDFInfo
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- CN114002095A CN114002095A CN202111000450.7A CN202111000450A CN114002095A CN 114002095 A CN114002095 A CN 114002095A CN 202111000450 A CN202111000450 A CN 202111000450A CN 114002095 A CN114002095 A CN 114002095A
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses a geotechnical test pressurizing device and an experimental method, relates to the field of geotechnical test pressurizing devices and experimental methods, and solves the problems that stress states and consolidation conditions of soil layers at different depths are difficult to simulate in geotechnical model tests. The technical scheme is characterized by comprising a bracket, wherein the bracket is of an annular cylindrical structure; inflatable confining pressure loading devices for applying confining pressure are arranged on the support at intervals along the vertical direction; the upper part of the inflatable confining pressure loading device is provided with a valve inside; the valve core is provided with a screwing type valve; still include the load subassembly, the load subassembly includes the push down device for fixing the load part of push down the device, and the technical effect utilizes the push down device realizes static loading, or the displacement and the power circulation loading of different wave forms, cooperation the gasbag provides the simulation test of side direction confined pressure in order to adapt to different operating modes of different models.
Description
Technical Field
The invention relates to the field of geotechnical test equipment, in particular to a geotechnical test pressurizing device and an experimental method.
Background
The rapid development of the economic society and the improvement of the modernization degree of design and construction promote the construction of infrastructures such as high-speed railways, large bridges, oil drilling platforms, wind driven generators and the like. In these engineering facilities, the pile foundation is widely used by virtue of its high bearing capacity, small deformation and high construction mechanization degree. However, in the service life of the pile foundation, the pile foundation not only bears the self-weight load from the upper structure, but also bears the action of vertical cyclic load with remarkable periodicity such as vehicle traffic load, self operation and the like for a long time. Such long-term cyclic loading inevitably affects the bearing characteristics of the pile foundation.
The current common research methods for geotechnical tests comprise in-situ tests and model tests. The large-scale model test has high cost, the conventional small-scale 1g model test has very limited confining pressure applied to the test pile, and the cyclic loading characteristic of the pile foundation obtained by the small-scale model test cannot truly reflect the cyclic loading characteristic of the pile foundation under the high confining pressure of the actual working condition in consideration of the nonlinearity of the stress strain of the soil body.
Disclosure of Invention
The invention aims to provide a geotechnical test pressurizing device and an experimental method, which have the advantages that the stress state and consolidation condition of soil layers with different depths can be simulated, and the vertical cyclic loading model test research of a pile foundation under different load combinations can be carried out aiming at foundation soil with different consolidation states.
The technical purpose of the invention is realized by the following technical scheme:
a geotechnical test pressurizing device comprises a groove type reaction pedestal and a model box positioned above the reaction pedestal, wherein a groove rail of the groove type pedestal is arranged in parallel to the long edge direction of the groove type reaction pedestal; the upper part of the groove type counter-force pedestal is provided with a load assembly; the load assembly comprises a support part connected with the grooved rail, a vertical load part connected with the support part through a bolt and a lateral load part positioned in the model box; the support part is provided with foundation bolts and is anchored with the counterforce pedestal; the upper part of the vertical load component is connected with a pressing device for applying pressure to the top of the experimental object; the pressing device comprises a servo motor, and the servo motor is fixed on the vertical load component through a connecting device.
By adopting the technical scheme, the lateral load component can provide lateral confining pressure, the application of the confining pressure is calculated according to the static soil pressure, and the calculation formula of the static soil pressure borne by the pile is sigma0＝k0Gamma z, the different soil layer soil of simulation that can be better brings the confined pressure for the test piece, makes the experimental condition more be close actual engineering, guarantees experimental data's accuracy nature, cooperates the vertical load that pushes down the device production simultaneously, and the experimentation has very strong flexibility.
Further setting: the inflatable confining pressure loading device comprises an air bag and an air valve, the air bag is positioned on the support, and the air valve is positioned on the side face of the air bag.
Through adopting above-mentioned technical scheme, the gasbag can correspond the pressurization according to the soil pressure of the different degree of depth, and the inflating valve sets up in the side influence that has maxmizing to surrounding soil layer, dwindles experimental error.
The air bag is further arranged to be an annular air bag, the air bag is made of rubber, and the top surface and the bottom surface of the air bag are planes.
By adopting the technical scheme, when a plurality of air bags are stacked, the air bags are connected with each other after being pressurized, the integrity is good after the air bags are stacked, the rubber material is not easily corroded by the environment in the soil, and the elasticity and the durability are good.
The support is further arranged to comprise a bottom ring, a middle ring and a top ring, and the bottom ring, the middle ring and the top ring are connected in a welding mode.
Through adopting above-mentioned technical scheme, the support has very strong stability, can provide a counter-force when the gasbag aerifys the loading, and the structure is comparatively light and handy, convenient transport and removal.
Further setting: the support lower part is connected with a plurality of supporting legs, the supporting legs are connected with the support in a welding mode, the supporting legs are arranged in a plurality of modes along the outer ring of the bottom ring of the support, and a base for placing the support is formed.
Through adopting above-mentioned technical scheme, the supporting legs provides the support for the support, prevents to rock about the support in the experiment and influences exerting of confined pressure, has guaranteed the precision of experiment.
Further setting: the support part comprises a bottom fixing plate on the groove rail, a plurality of bottom frame columns are arranged on the bottom fixing plate, and an upper fixing plate is fixedly connected to the bottom frame columns; the upper fixing plate is connected with a plurality of upper frame columns, and the upper frame columns are connected with a top connecting plate; threaded holes are formed in two sides of the top connecting plate.
Through adopting above-mentioned technical scheme, bottom fixed plate area is great, enables bottom fixed plate and reaction pedestal contact surface unit area's atress when the loading and reduces, has improved whole atress performance, and the frame post is arranged according to upper and lower two-layer, and reaction member overall stability is better, and top connecting plate both sides are equipped with the installation dismantlement that the screw hole made things convenient for the load part.
Further setting: the load component comprises two vertical upright columns, and the upper parts of the vertical upright columns are fixedly connected with a cross beam; reinforcing support plates are arranged on two sides of the bottom end of the upright post, and connecting steel plates are connected to two sides of the upper end of each reinforcing support plate; the connecting steel plate is provided with a bolt hole and is connected with the top connecting plate of the support component through a bolt.
Through adopting above-mentioned technical scheme, the reinforcing extension board of both sides has strengthened the holistic stability of load part, and non-deformable has increased the durability of use simultaneously, and through bolted connection support part and load part, makes things convenient for both to dismantle and the installation.
Further setting: the load component comprises a connecting device, and the connecting device comprises a lower connecting plate positioned at the lower part of the cross beam and an upper connecting plate positioned at the upper part of the cross beam; the lower connecting plate and the upper connecting plate are provided with a plurality of bolt holes and connected through stud bolts; the connecting device can slide along the direction of the cross beam.
Through adopting above-mentioned technical scheme, use two connecting plates to connect crossbeam and servo motor, can be convenient adjust servo motor's position in the experimentation, and two connecting plates are connected through four stud, have very strong stability, are difficult for producing the deformation in the experiment.
The invention also aims to provide an experimental method of the geotechnical loading device, which comprises the following steps:
s1, preparation phase
S1.1, determining the particle size and the water content of soil and sand through geotechnical experiments, and roughly calculating the ultimate bearing capacity of the pile;
s1.2, positioning and horizontally placing a support, sequentially and horizontally placing an uninflated inflatable confining pressure loading device on the support, simultaneously filling bottom sand and silt clay to a preset height, and finally positioning a test piece and vertically driving the test piece into the preset depth.
S2, adjusting stage
S2.1, calculating soil pressures at different depths, and respectively inflating inflatable confining pressure loading devices at different positions to preset pressures according to calculated values;
s2.2, sliding the pressing device along the direction of the cross beam to align with the test pile and fixing the connecting device according to the position of the test piece;
and S2.3, connecting the experimental instrument and adjusting parameters of the experimental instrument.
Experimental stage S3
S3.1, slowly and statically loading or loading pressure in a reciprocating circulation manner on the test piece through a load preset by the pressing device;
and S3.2, recording experimental data by a data acquisition instrument.
S4 end stage
And S4.1 stopping loading after the experiment is finished.
By using the geotechnical experiment loading device in the experiment method, the experiment efficiency can be higher, and the experiment result is more accurate.
In conclusion, the invention has the following beneficial effects:
1. support part and vertical load part, servo motor and crossbeam are all through high-strength steel bolted connection, convenient dismantlement and installation, and removable the getting off when not testing is placed, prevent the fatigue deformation because of the dead weight produces.
2. The confining pressure loading is carried out in the mode of inflating the inflatable confining pressure loading device, so that the confining pressure loading device has strong flexibility and operability, and can correspondingly impact a certain amount of gas to generate corresponding pressure aiming at different stress states of different soil layers, so that the environment of an experimental soil layer is closer to the real situation, and the experimental data is more accurate.
3. Inflatable confined pressure loading device, the equal used repeatedly of support, connection plate are the Q235 steel, have very high intensity, leave sufficient bearing capacity safety deposit during the experiment.
4. Slot type counter-force pedestal, support part and load part pass through bolted connection and constitute a rigidity great, the counter-force component that the wholeness is good, can balance the great counter-force that produces in the experiment, counter-force component has fine stability simultaneously, displacement skew is minimum in experiment loading process, the accuracy of experimental data when having guaranteed the loading, and load part passes through bolted connection on the support part, the experiment is accomplished or the adjustment is conveniently dismantled when needing to adjust the loading position, very strong flexibility has.
Drawings
FIG. 1 is a schematic structural view of a first preferred embodiment;
in the figure, 1, a groove type reaction force pedestal; 2. a groove rail; 3. a support member; 30. a bottom fixing plate; 31. a bottom frame column; 32. an upper fixing plate; 33. an upper frame column; 34. a top connection plate; 4. a vertical load component; 41. Reinforcing the support plate; 42. connecting steel plates; 43. a vertical column; 44. a cross beam; 5. a pressing device; 51. a connecting device; 511. an upper connecting plate; 512. a lower connecting plate; 52. a servo motor; 6. a lateral load member; 61. an inflation line; 62. a support; 623. a bottom ring; 622. a middle ring; 621. a top ring; 63. an inflatable confining pressure loading device; 631. an air bag; 632. screwing-type inflating valve; 64. support the feet.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings
A preferred embodiment:
a pressure device for geotechnical experiments, as shown in FIG. 1, comprises a groove type reaction force pedestal 1 for balancing reaction force generated by load applied on a test piece, and groove rails 2 arranged in parallel along the long side direction.
As shown in fig. 1, a load module is provided on the groove-type reaction force base 1, so that the test piece can be easily pressed into the test chamber by the load module. The load assembly comprises a support part 3 connected with two sides of the groove type reaction force pedestal 1, a vertical load part 4 detachably connected with the support part 3 and a pressing device 5.
As shown in fig. 1, the support part 3 is disposed on the groove rails 2 at both sides of the groove type reaction force pedestal 1, the support part 3 includes a bottom fixing plate 30 on the groove rail 2 at each side, and a plurality of bottom frame columns 31 are welded on the bottom fixing plate 30; the plurality of frame columns are distributed at equal intervals, so that the bottom frame column 31 can be stressed better and evenly; the upper end of the bottom frame column 31 is welded to an upper fixing plate 32, and the upper fixing plate 32 has the same shape as the bottom fixing plate 30, so that the stand member 3 has a stable support. The upper fixing plate 32 is symmetrically connected with two upper frame columns 33 along the groove direction, the upper frame columns 33 are connected with the upper fixing plate 32 through welding, a top connecting plate 34 is arranged on the upper frame columns 33, and two ends of the top connecting plate 34 are respectively connected with the upper frame columns 33 through welding.
As shown in fig. 1, the vertical load component is arranged on the support component 3 and connected with the support component 3 through a bolt, the bottom of the vertical load component 4 is symmetrically provided with reinforcing support plates 41, the upper parts of the reinforcing support plates 41 are welded with connecting steel plates 42, the upper parts of the connecting steel plates 42 are welded with vertical upright posts 43, and the two vertical upright posts 43 are symmetrically arranged along the groove direction, so that the structure has better stability; a cross beam 44 is welded above the two vertical upright columns 43, and the cross beam 44 is an H-shaped channel steel; the cross beam 44 is provided with a pressing device 5 for cyclic loading, the pressing device 5 comprises a servo motor 52 and a connecting device 51 capable of fixing the servo motor 52 at any position of the cross beam 44, the connecting device 51 comprises an upper connecting plate 511 and a lower connecting plate 512, and the upper connecting plate 511 and the lower connecting plate 512 are connected through a plurality of bolts, so that the servo motor 52 can be fixed at any horizontal position of the cross beam 44, and the position of a loading point can move freely.
As shown in fig. 1, a side load member 6 is disposed above the groove-type reaction force pedestal 1, and the side load member 6 includes a bracket 62 and an inflatable confining pressure loading device 63 disposed on the bracket 62 and providing a radial confining pressure to the internal workpiece.
The inflatable confining pressure loading device 63 comprises an air bag 631 and a screwed air valve 632, wherein the air bag 631 is made of rubber, has good elasticity and sealing performance, and can prevent the situations of bursting, air leakage and the like during inflation and pressurization. The top and the bottom of the inflatable confining pressure loading device 63 formed by the air bags 631 are both flat surfaces, and when a plurality of air bags are stacked, the connection between the layers of the air bags 631 after pressurization is facilitated.
The support 62 is an annular cylindrical structure, and is formed by sequentially welding and connecting a bottom ring 623, a middle ring 622 and a top ring 621 from bottom to top at a certain distance, and can play a role of providing a lateral support force acting point when the inflatable confining pressure loading device 63 is inflated so as to apply radial confining pressure to the internal soil.
The lower part of the bracket 62 is connected with a plurality of supporting feet 64, the supporting feet 64 are arranged along the outer ring of the bracket 62, a plurality of supporting feet form a base for placing the bracket 62, and the inflatable confining pressure loading device 63 can play a role in fixing the positions of the bracket 62 and the air bag 631 when being inflated. Inflatable confined pressure loading device 63 can adjust its confined pressure of exerting through the aeration quantity in order to adapt to the different requirements of different degree of depth soil layer confined pressure in the experiment, has very strong flexibility in the experiment also guaranteed the precision of experiment.
Design data analysis
The load components 20 are made of Q235 steel, and the design strength values f of tensile strength, compression strength and bending strength of the Q235 steel are 200 (N/mm)2) After the maximum allowable load design value P is calculated to be 2100(KN), the maximum pressure application value of the servomotor 52 is 200(t), and the experimental requirement is satisfied.
The foundation bolt adopts Q235 steel, and Q235 steel's tensile strength design value ft is 554(KN), and this experimental apparatus has adopted at least 4 foundation bolts, calculates according to 4 foundation bolts at minimum, and the experimental machine maximum load is 200(t), and then the pulling force that each bolt bore is 500(KN), and 500(KN) < 554(KN), satisfies the design requirement.
The design value q of the groove rail 22 is 400KN/m, and the tensile strength of the anchor bolt can be satisfied, so that the counter force generated when the test machine 31 applies the maximum load can be balanced, and the experimental result is more accurate.
An experimental method of a geotechnical loading device comprises the following steps:
s1, preparation phase
S1.1, determining the particle size and the water content of soil and sand through a geotechnical experiment, and calculating the ultimate bearing capacity of the pile;
s1.2, positioning and horizontally placing the air bag 631 support 62, sequentially and horizontally placing the uninflated air bags 631 on each ring body of the air bag 631 support 62, enabling the upper surface and the lower surface of each air bag 631 to be in contact, and fixing the air bags 631 by using the support 62; and simultaneously filling bottom sand and silt clay to a preset height in sequence from bottom to top, finally positioning the test piece and vertically driving the test piece to a preset depth.
S2, adjusting stage
S2.1, calculating the soil pressures at different depths, and respectively inflating the air bags 631 at different positions to preset pressures according to the calculated values; a total of 22 layers of air bags 631 are arranged to pressurize the soil around the pile, each layer being 5 cm. The difference of the pressurization of each air bag 631 in the upper silt layer in the static load test is 3kPa, and the difference of the pressurization of each air bag 631 in the lower sandy soil layer is 2 kPa.
S2.2, sliding the pressing device 5 along the beam 44 to align with the test pile and fixing the connecting device 51 according to the position of the test piece;
and S2.3, connecting the experimental instrument and adjusting parameters of the experimental instrument.
Experimental stage S3
S3.1, slowly and statically loading or loading pressure in a reciprocating circulation manner on the test piece through a load preset by the pressing device 5; the loading method during the vertical load static load test adopts a slow-speed load maintaining method of building pile foundation detection technical specification GB106-2018 to test the ultimate bearing capacity of a single pile. The test piles are loaded in a grading mode according to the designed ultimate bearing capacity, and the loading amount of each grade is 1/10 of the designed ultimate bearing capacity. And applying vertical loads in stages. And recording the load capacity and the vertical displacement under the action of each level of load.
And S3.2, recording experimental data by a data acquisition instrument.
S4 end stage
And S4.1, stopping loading and processing the data after the experiment is finished.
According to the experimental data, when the air bag 631 is not used for loading and confining pressure, the test pile reaches the settlement failure critical value of 5mm after 1000 times of circulation, and reaches the settlement failure critical value of 5mm after twenty thousand times of confining pressure, which shows that the pile side frictional resistance is exerted to be larger after the air bag 631 is used for applying confining pressure, and the actual working condition can be better simulated.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
Claims (9)
1. A geotechnical test pressurizing device comprises a groove type reaction pedestal (1); the upper part of the groove type reaction pedestal (1) is provided with a load assembly, and the load assembly comprises a support part (3) arranged on the groove type reaction pedestal (1) and a vertical load part (4) arranged on the support part (3); the upper part of the vertical load component (4) is connected with a pressing device (5) for applying pressure to the top of the experimental object;
the method is characterized in that: the upper part of the groove type reaction force pedestal (1) is also provided with a lateral load component (6), and the lateral load component (6) comprises a support (62) and an inflatable confining pressure loading device (63) which is arranged on the support (62) and provides radial confining pressure for an internal workpiece.
2. The geotechnical test pressurization device according to claim 1, wherein: the inflatable confining pressure loading device (63) comprises an air bag (631) and an air valve, wherein the air bag (631) is located on the support (62), and the air valve is located on the side face of the air bag (631).
3. The geotechnical test pressurization device according to claim 2, wherein: the air bag (631) is an annular air bag (631), the material of the air bag (631) is rubber, and the top surface and the bottom surface of the air bag (631) are planes.
4. The geotechnical test pressurization device according to claim 1, wherein: the support (62) comprises a bottom ring (623), a middle ring (622) and a top ring (621), and the bottom ring (623), the middle ring (622) and the top ring (621) are connected in a welding mode.
5. The geotechnical test pressurization device according to claim 1 or 4, wherein: support (62) sub-unit connection has a plurality of supporting legs (64), supporting legs (64) and support (62) welded connection, supporting legs (64) set up a plurality ofly along bottom ring (623) outer lane of support (62), form the base that supplies support (62) to place.
6. The geotechnical test pressurization device according to claim 1, wherein: the support part (3) comprises a bottom fixing plate (30) on the groove rail (2), a plurality of bottom frame columns (31) are arranged on the bottom fixing plate (30), and upper fixing plates (32) are fixedly connected to the bottom frame columns (31);
the upper fixing plate (32) is connected with a plurality of upper frame columns (33), and the upper frame columns (33) are connected with a top connecting plate (34); threaded holes are formed in two sides of the top connecting plate (34).
7. The geotechnical test pressurization device according to claim 1, wherein: the vertical load component (4) comprises two vertical upright columns (43), and the upper parts of the vertical upright columns (43) are fixedly connected with a cross beam (44); reinforcing support plates (41) are arranged on two sides of the bottom end of the upright post, and connecting steel plates (42) are connected to two sides of the upper end of each reinforcing support plate (41);
the connecting steel plate (42) is provided with a bolt hole and is connected with the top connecting plate (34) of the support component (3) through a bolt.
8. The geotechnical test pressurization device according to claim 1, wherein: the pressing device (5) comprises a connecting device (51), and the connecting device (51) comprises a lower connecting plate (512) positioned at the lower part of the cross beam (44) and an upper connecting plate (511) positioned at the upper part of the cross beam (44);
the upper connecting plate (511) and the lower connecting plate (512) are provided with a plurality of bolt holes, and the upper connecting plate (511) and the lower connecting plate (512) are connected through stud bolts; the connecting device (51) can slide along the direction of the cross beam (44);
the test device also comprises a servo motor (52) for applying vertical load to the test piece.
9. An experimental method of a geotechnical test pressurizing device is characterized in that:
s1, preparation phase
S1.1, determining the particle size and the water content of soil and sand through a geotechnical experiment, and calculating the ultimate bearing capacity of the pile;
s1.2, positioning and horizontally placing a support (62), sequentially and horizontally placing an uninflated air bag (631) on the support (62), simultaneously filling bottom-layer sandy soil and silt clay to a preset height, and finally positioning a test piece and vertically driving the test piece to a preset depth;
s2, adjusting stage
S2.1, calculating soil pressures at different depths, and respectively inflating inflatable confining pressure loading devices (63) at different positions to preset pressures according to calculated values;
s2.2, according to the position of the test piece, sliding the pressing device (5) along the direction of the cross beam (44) to align with the test pile and fixing the connecting device (51);
s2.3, connecting an experimental instrument, and adjusting parameters of the experimental instrument;
experimental stage S3
S3.1, slowly loading static force or reciprocating cyclic loading pressure on the test piece through a load preset by the pressing device (5);
s3.2, recording experimental data through a data acquisition instrument;
s4 end stage
And S4.1 stopping loading after the experiment is finished.
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| CN117871267A (en) * | 2024-03-12 | 2024-04-12 | 西南交通大学 | Consolidation apparatus and implementation method for non-confined condition |
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| CN109443944A (en) * | 2018-12-19 | 2019-03-08 | 北京科技大学 | The three axis flexible compression devices obtained for the real-time sound pressure information of soil-rock mixture |
| CN109870364A (en) * | 2019-03-18 | 2019-06-11 | 福建工程学院 | Stress-seepage coupling acts on the experimental rig and method of lower Rock And Soil |
| CN212989118U (en) * | 2020-05-29 | 2021-04-16 | 中南大学 | Air bag confining pressure type seepage device |
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| CN112504809A (en) * | 2020-10-16 | 2021-03-16 | 浙江理工大学 | Catastrophe simulation device and experimental method |
| CN113295539A (en) * | 2021-06-01 | 2021-08-24 | 中国长江三峡集团有限公司 | Plane strain test device and method for reinforced soil unit body |
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