CN215296902U - Large-scale compression test equipment - Google Patents
Large-scale compression test equipment Download PDFInfo
- Publication number
- CN215296902U CN215296902U CN202120859288.3U CN202120859288U CN215296902U CN 215296902 U CN215296902 U CN 215296902U CN 202120859288 U CN202120859288 U CN 202120859288U CN 215296902 U CN215296902 U CN 215296902U
- Authority
- CN
- China
- Prior art keywords
- loading
- sample
- test
- compression test
- scale compression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model relates to the technical field of soil mechanics test equipment, in particular to large-scale compression test equipment, which comprises a base, wherein a sample cylinder is detachably arranged on the base, the bottom of the sample cylinder is provided with a jacking mechanism, the jacking mechanism is positioned in the base, and the top of the sample cylinder is provided with a pressing unit; the utility model does not need to divide the particle size of the material, reduces the error of the test sample caused by the size effect, and can select sample cylinders with different sizes to test according to the particle size of the material; the jacking mechanism used by the utility model can push out the sample after the test is finished, and the disturbance damage generated in the moving and taking-out process of the sample is reduced, thereby being beneficial to analyzing the structural characteristics of the sample after being pressed; the utility model discloses with the compression test time sample around play the used sample section of thick bamboo of side limit effect and get rid of the back, under the disturbance condition, can also carry out no side limit compressive strength test, strengthen test equipment functionality, obtain the test parameter when also changing for test condition and provide new selection.
Description
Technical Field
The utility model relates to a soil mechanics test equipment technical field, concretely relates to large-scale compression test equipment.
Background
The large-particle-size and coarse-particle discrete material is widely applied to engineering construction of earth and rockfill dams, roads, railways, house foundations, bank protection riprap bodies, river dikes, bay breakwaters and the like. The lateral limit compression test of the large-particle-size and coarse-particle discrete material aims at measuring the sedimentation deformation of the large-particle-size and coarse-particle discrete material, knowing the relation between the deformation of the material under the lateral limit condition and time and pressure, calculating the compression coefficient and the compression modulus of the material by combining other physical and mechanical indexes, and determining the compressibility of the material. Engineering mechanical parameters of large-particle-size and coarse-particle discrete material are used as engineering design and construction bases, the reasonability of the engineering design and the economic benefit of a project are directly determined, and the acquisition path of the parameters is particularly important.
The traditional compression test mainly measures the mechanical property of the material under the action of axial static pressure, and is one of the basic methods for testing the mechanical property of the material. The maximum compressive load at which the specimen fails divided by the cross-sectional area of the specimen is referred to as the compressive strength limit or compressive strength. The traditional compression test is mainly suitable for brittle materials such as rocks, concrete building materials and the like. For plastic materials, the compressive strength limit cannot be measured, but the elastic modulus, the proportional limit, the yield strength, etc. can be measured.
Due to the structural characteristics of plastic materials such as large-particle-size soil and coarse-particle soil, the test instrument is large, the equipment is slow to reform, the structural function is single, and certain defects exist in the set of test conditions. Compression test equipment in the existing specification is mainly designed for plastic materials such as fine aggregates, coarse aggregates and the like, the maximum test particle size is 60mm, when the particle size of the material is larger than 60mm, the particle size is scaled to be within 60mm for testing, and due to the limitation of the size of an instrument, the natural grading of the material needs to be scaled down, so that the simulation grading adopted by an indoor test and the natural grading of the material can have differences.
Indoor simulation test methods (including sample density control standard, simulation grading scale limit size determination method, test result sorting method and the like) for deformation characteristics of large-particle-size and coarse-particle materials are difficult problems which are immature at present and urgently need to be solved. Namely, the result of the test has certain errors due to the size effect of the sample.
In addition, a series of parameters need to be acquired in scientific research and production project tests, and how to conveniently take out test samples for next-step physical and mechanical parameter measurement is a new problem after a compression test is finished. After the test of the traditional compression test sample is finished, the aggregate is compacted due to the normal stress effect, and the aggregate is difficult to take out on the premise of not disturbing or slightly disturbing the sample.
Therefore, in order to solve the problem that above-mentioned test method is inconsistent with actual conditions, the utility model provides a further reduce size effect influence, be convenient for the sample and shift out, and increase the large-scale compression test device of unconfined compressive strength test function.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes prior art's is not enough, provides a large-scale compression test equipment, especially has the compression test that can be used for material more than 60mm to make the easy appearance of unloading after experimental the end, it still carries out the experimental characteristics of no limit compressive strength simultaneously.
The utility model provides a technical problem can adopt following technical scheme to realize:
the utility model provides a large-scale compression test equipment, includes the base at least, can dismantle on the base and be provided with the sample section of thick bamboo, the bottom of sample section of thick bamboo is provided with climbing mechanism, and climbing mechanism is located the base, and the top of sample section of thick bamboo is provided with the unit of exerting pressure.
Further, the jacking mechanism comprises a bearing plate, a connecting piece and a hydraulic jack, wherein the hydraulic jack is arranged in the base, a telescopic head of the hydraulic jack is connected with the connecting piece, the top of the connecting piece is connected with the bearing plate, when the hydraulic jack does not extend out, the bearing plate is positioned in the bottom of the sample cylinder, and the diameter of the bearing plate is slightly smaller than that of the sample cylinder.
Further, the unit of exerting pressure include drive unit, bracing piece, supporting seat and loading unit, the loading unit is connected at the bracing piece top, and the bottom of bracing piece is connected in the supporting seat, drive unit and bracing piece are connected, and drive unit drive loading unit and bracing piece reciprocate in the supporting seat.
Furthermore, the loading unit comprises a loading module, a loading rod and a loading plate, two ends of the loading module are respectively connected with the supporting rods, the loading rod is vertically and fixedly connected to the bottom end of the middle part of the loading module, the plate surface of the loading plate is vertically and fixedly connected to the bottom end of the loading rod, the loading plate is positioned right above the sample tube, and the diameter of the loading plate is slightly smaller than that of the sample tube.
Further, a pressure sensor is arranged between the loading rod and the loading plate.
Furthermore, the driving unit comprises a driving mechanism and a transmission belt, the driving mechanism is a loading motor, a transmission shaft of the loading motor is connected with one end of the transmission belt, and the other end of the transmission belt is connected with the supporting rod.
Further, the large-scale compression test equipment further comprises a displacement sensor for monitoring the displacement distance of the pressing unit.
The utility model has the advantages that:
compared with the prior art:
1. the utility model discloses enlarged the scope of the particle diameter of test material, partial large particle diameter, coarse grain material need not to carry out the division to the material particle diameter, can select not unidimensional specimen cylinder to test according to the material particle diameter. Not only expands the selection range of the test object, but also avoids the requirement that the particles larger than 60mm are required to be removed from part of test samples.
2. The utility model discloses a hydraulic jack can be ejecting with the sample after experimental, reduces the sample degree of difficulty after experimental. The disturbance of the sample taken out is small, and a foundation is laid for the next test of keeping the characteristics of the sample in the state.
3. The utility model discloses get rid of the back with the used sample section of thick bamboo of compression, can also carry out unconfined compressive strength test. The utility model discloses expand the function of instrument, can have the compression test of limit and do not have the conversion between the limit compressive strength test, improve the utilization efficiency of laboratory glassware.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic sectional view of the present invention.
In the figure: the device comprises a base 1, an upper cover 2, a sample cylinder 3, a loading plate 4, a loading rod 5, a loading module 6, a supporting rod 7, a supporting seat 8, a driving mechanism 9, a jacking mechanism 10, a connecting piece 11, a transmission belt 12, a displacement sensor 13, a pressure sensor 14 and a bearing plate 15.
Detailed Description
It should be noted that, in the embodiments of the present invention, the related large-scale compression testing apparatus can be made into different sizes of apparatuses according to the size of the material particle diameter to be detected, so as to meet the requirements of the indoor simulation test of the deformation characteristics of the large-particle diameter and coarse-particle material.
The technical solution of the large-scale compression testing equipment provided by the embodiments of the present invention will be described in detail through several specific embodiments.
Example 1:
referring to fig. 1 and 2, the large-scale compression test equipment at least comprises a base 1, wherein a sample cylinder 3 is detachably arranged on the base 1, a jacking mechanism 10 is arranged at the bottom of the sample cylinder 3, the jacking mechanism 10 is positioned in the base 1, and a pressure applying unit is arranged at the top of the sample cylinder 3.
In the above embodiment, the base 1 is a box structure with an open top and a hollow middle, a cover structure can be arranged on the top of the box structure, the sample tube 3 is arranged in the middle of the cover on the top, the jacking mechanism 10 is arranged right below the sample tube 3 in the box structure, and the pressing unit is arranged right above the sample tube 3 for pressing, so as to perform an indoor simulation test on the deformation characteristics of large-particle-diameter and coarse-particle materials. The box body structure is made of a high-strength steel structure material, the thickness of the box body structure is not lower than 2 cm, and the thickness of the cover body is not lower than 1 cm, so that the bearing strength of the whole base 1 in the test process is guaranteed.
Further, the jacking mechanism 10 comprises a bearing plate 15, a connecting piece 11 and a hydraulic jack, the hydraulic jack is arranged in the base 1, a telescopic head of the hydraulic jack is connected with the connecting piece 11, the top of the connecting piece 11 is connected with the bearing plate 15, when the hydraulic jack does not extend out, the bearing plate 15 is positioned in the bottom of the sample cylinder 3, and the diameter of the bearing plate 15 is slightly smaller than that of the sample cylinder 3.
The method comprises the steps of arranging a hydraulic jack in a base 1, connecting a connecting piece 11 at the end part of a telescopic rod of the hydraulic jack, and then fixedly connecting a bearing plate 15 at the top of the connecting piece 11, wherein under the condition that the hydraulic jack does not stretch, the height of the bearing plate 15 is flush with the upper surface of a cover body at the upper part of a box body structure, a hole slightly larger than the diameter of the bearing plate 15 is arranged on the cover body, an L-shaped groove with the diameter slightly larger than the diameter of a sample cylinder 3 is arranged on the outer side of the hole and used for placing the sample cylinder 3 so as to limit the position of the sample cylinder 3, the sample cylinder 3 can be installed or dismantled according to the experimental requirements, the bearing plate 15 is arranged in the bottom of the sample cylinder 3 and used for placing a large-particle-diameter and coarse-particle material sample, the diameter of the bearing plate 15 is slightly smaller than the diameter of the sample cylinder 3 by 1-2mm, so that the sample cylinder 3 can wrap large-particle-diameter and coarse-particle bulk materials in the sample cylinder 3, the problem that the traditional compression test is only limited to the test of solid block samples is solved, and the sample processing links are reduced. The hydraulic jack used by the utility model can push out the sample after the test is finished, and reduce the disturbance damage generated in the process of moving and taking out the sample, thereby being beneficial to analyzing the structural characteristics of the sample after being pressed, and effectively avoiding the difficult problems that the sample after being compressed is tightly combined with the sample placing cylinder and the sample is easy to damage or disturb; the utility model discloses a sample 3 plays the limit effect around the sample when will compression test, and used sample 3 gets rid of the back, under the circumstances of not disturbing, can also carry out no limit compressive strength test, and reinforcing test equipment is functional, also provides new selection for obtaining test parameter when experimental condition changes.
Further, the unit of exerting pressure include drive unit, bracing piece 7, supporting seat 8 and loading unit, the loading unit is connected at bracing piece 7 top, and the bottom of bracing piece 7 is connected in supporting seat 8, and drive unit is connected with bracing piece 7, and drive unit drive loading unit and bracing piece 7 reciprocate in supporting seat 8.
Wherein, a hollow cavity body which is higher than the height of the sample cylinder 3 is arranged in the supporting seat 8, the inner wall of the cavity body is provided with threads, the bottom of the supporting rod 7 is provided with threads, and the loading unit and the supporting rod 7 are driven by the driving unit to move up and down in the supporting seat 8 so as to apply pressure to large-particle-diameter and coarse-particle materials in the sample cylinder 3.
Further, the loading unit comprises a loading module 6, a loading rod 5 and a loading plate 4, two ends of the loading module 6 are respectively connected with the support rod 7, the loading rod 5 is vertically and fixedly connected to the bottom end of the middle part of the loading module 6, the plate surface of the loading plate 4 is vertically and fixedly connected to the bottom end of the loading rod 5, the loading plate 4 is positioned right above the sample cylinder 3, and the diameter of the loading plate 4 is slightly smaller than that of the sample cylinder 3.
The loading module 6 can be a T-shaped structure, a loading rod 5 can be additionally connected to the numerical value structure of the T-shaped structure according to the height requirement of the device, the lower end of the loading rod 5 is connected with a loading plate 4, the structural size of the loading plate 4 is consistent with that of a loading plate 15, a certain distance is reserved above the sample cylinder 3 when no pressure is applied, a sample can be conveniently placed in the loading module, a group of supporting rods 7 are respectively connected to two ends of the loading module 6, two corresponding supporting seats 8 are correspondingly arranged in the base 1, and the supporting rods 7 penetrate through the cover body structure and are connected into the supporting seats 8.
Further, a pressure sensor 14 is arranged between the loading rod 5 and the loading plate 4, and the pressure sensor 14 can detect the magnitude of the pressure applied during the test.
Further, the driving unit comprises a driving mechanism 9 and a transmission belt 12, the driving mechanism 9 is a loading motor, a transmission shaft of the loading motor is connected with one end of the transmission belt 12, and the other end of the transmission belt 12 is connected with the supporting rod 7.
Can the outside notched bearing of taking on load motor's transmission shaft, then install belt 12 in the recess of bearing, thereby restriction belt 12's position, can connect fixed connection sleeve pipe on bracing piece 7, set up the recess on the sheathed tube outer wall, cup joint belt 12 in sheathed tube recess, thereby the belt drives the sleeve pipe and drives bracing piece 7 rotation when rotating, thereby make bracing piece 7 and top connect the loading unit downstream and exert pressure, when need not exert pressure, control loading motor reversal, bracing piece 7 and top connection loading unit rebound. The belt 12 can also be directly connected with the supporting rod 7, the supporting rod 7 is provided with a belt limiting ring, and the sleeve is arranged to reduce the abrasion of the belt and prolong the service life of the whole device.
Further, large-scale compression test equipment is still including the displacement sensor 13 that is used for monitoring the unit displacement distance that exerts pressure, offer the hole that is used for passing bracing piece 7 on the lid structure of base, set up displacement sensor 13 on the border of hole, displacement sensor 13 can detect the displacement distance about the bracing piece 7, effectively avoid the tradition to confirm the error of displacement according to the number of revolutions, can directly transmit the displacement into the computer, real time monitoring displacement and compression pressure direct relation, thereby judge experimental process, after measuring displacement distance and the pressure data many times, can establish the relation curve of displacement and pressure, explain the compression deformation performance of experimental material, evaluation material stress stability.
Example 2:
the bottom of bracing piece 7 is rotated and is connected in supporting seat 8, drive unit is connected with bracing piece 7, drive unit drive bracing piece 7 is at 8 internal rotations in the supporting seat, thereby make loading unit reciprocate on bracing piece 7, exert pressure for experimental sample, specifically be for the bearing at supporting seat 8, bracing piece 7 passes through the bearing and rotates, displacement does not take place at supporting seat 8, the top of bracing piece 7 is the threaded rod, loading module 6's both ends threaded connection bracing piece 7, when bracing piece 7 rotates, loading module 6's top can be stretched out at bracing piece 7's top, loading module 6 can reciprocate on bracing piece 7 in other words, thereby exert pressure, other structures are the same with embodiment 1's structure, the realization process is the same.
Example 3:
coarse soil loose particles used in the test, such as broken construction waste and mixed soil containing broken stones;
placing a sample cylinder 3 and smearing thin-layer lubricating oil on the bottom and the side wall of the sample cylinder 3;
selecting a test sample, and adding the test sample into a test cylinder in a layered manner;
in order to prevent the uneven stress of the mixture, certain pre-pressure is applied after the mixture is loaded, so that the surface of the sample is as flat as possible;
the adopted uniform compression means; the uniform pressure test is realized by a loading motor.
Step loading is carried out according to preset loading levels (50, 100, 150, … and 300kN), and the displacement values of the displacement sensors under different pressures and the pressure values of the pressure sensors are read through software, so that a relationship can be established; the software here is the existing "compression testing machine software", and this kind of software has all to install at ordinary compression testing machine computer when purchasing, for example, the YES-2000 compression testing machine software of the test machine factory in Jinan, and EHC-1300 computer control full-automatic compression testing machine software of the country building instrument and equipment factory in Hebei donation, the utility model discloses a can directly adopt in the device.
The test was stopped until the pressure reached the predetermined upper pressure limit.
After the test is finished, the loading module 6 and the loading plate 4 are lifted;
starting a hydraulic jack, wherein the hydraulic jack acts on a bearing plate 15 arranged at the bottom of the sample cylinder;
gradually pushing out the sample at a constant speed of 0.5-2 mm/s; a speed of 0.5-2mm/s can be achieved by means of an electric motor.
The pushed-out sample is carried together with the carrier plate 15 for further testing.
According to the requirement of the test, the sample cylinder 3 can be removed and placed; placing the prepared sample directly on the bearing plate 15, and the loading module 6 slightly acts on the sample through the loading plate 4;
pressurizing at a constant speed and starting the test;
the pressurization device operation, pressure and displacement during loading was recorded.
And (5) disassembling the equipment when the test is finished.
The test data is more accurate by the method.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all such changes are within the scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Technical solutions between various embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Claims (7)
1. A large-scale compression test equipment at least comprises a base (1), and is characterized in that: the pressure-applying device is characterized in that a sample cylinder (3) is detachably arranged on the base (1), a jacking mechanism (10) is arranged at the bottom of the sample cylinder (3), the jacking mechanism (10) is located in the base (1), and a pressure-applying unit is arranged at the top of the sample cylinder (3).
2. A large scale compression test apparatus according to claim 1, wherein: climbing mechanism (10) include loading board (15), connecting piece (11) and hydraulic jack, hydraulic jack sets up in base (1), and connecting piece (11) are connected to hydraulic jack's flexible head, and loading board (15) are connected at the top of connecting piece (11), when hydraulic jack did not stretch out, loading board (15) are located the bottom of sample tube (3), the diameter of loading board (15) slightly is less than the diameter of sample tube (3).
3. A large scale compression test apparatus according to claim 1 or 2, wherein: the pressing unit comprises a driving unit, a supporting rod (7), a supporting seat (8) and a loading unit, the loading unit is connected to the top of the supporting rod (7), the bottom of the supporting rod (7) is connected into the supporting seat (8), the driving unit is connected with the supporting rod (7), and the driving unit drives the loading unit and the supporting rod (7) to move up and down in the supporting seat (8).
4. A large scale compression test apparatus according to claim 3, wherein: the loading unit comprises a loading module (6), a loading rod (5) and a loading plate (4), two ends of the loading module (6) are respectively connected with the supporting rods (7), the loading rod (5) is vertically and fixedly connected to the bottom end of the middle part of the loading module (6), the plate surface of the loading plate (4) is vertically and fixedly connected to the bottom end of the loading rod (5), the loading plate (4) is positioned right above the sample cylinder (3), and the diameter of the loading plate (4) is slightly smaller than that of the sample cylinder (3).
5. A large scale compression test apparatus according to claim 4, wherein: and a pressure sensor (14) is also arranged between the loading rod (5) and the loading plate (4).
6. A large scale compression test apparatus according to claim 3, wherein: the driving unit comprises a driving mechanism (9) and a transmission belt (12), the driving mechanism (9) is a loading motor, a transmission shaft of the loading motor is connected with one end of the transmission belt (12), and the other end of the transmission belt (12) is connected with the supporting rod (7).
7. A large scale compression test apparatus according to claim 1, wherein: the large-scale compression test equipment further comprises a displacement sensor (13) for monitoring the displacement distance of the pressing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120859288.3U CN215296902U (en) | 2021-04-25 | 2021-04-25 | Large-scale compression test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120859288.3U CN215296902U (en) | 2021-04-25 | 2021-04-25 | Large-scale compression test equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215296902U true CN215296902U (en) | 2021-12-24 |
Family
ID=79537896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120859288.3U Active CN215296902U (en) | 2021-04-25 | 2021-04-25 | Large-scale compression test equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215296902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012495A (en) * | 2018-09-20 | 2018-12-18 | 西安力创材料检测技术有限公司 | The device of dynamic monitoring deformation index under a kind of high-temperature and high-pressure conditions in reaction kettle |
-
2021
- 2021-04-25 CN CN202120859288.3U patent/CN215296902U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109012495A (en) * | 2018-09-20 | 2018-12-18 | 西安力创材料检测技术有限公司 | The device of dynamic monitoring deformation index under a kind of high-temperature and high-pressure conditions in reaction kettle |
| CN109012495B (en) * | 2018-09-20 | 2024-03-15 | 西安力创材料检测技术有限公司 | Device for dynamically monitoring deformation index under high-temperature and high-pressure condition in reaction kettle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106290006B (en) | A kind of experimental rig measuring shear strength parameter variation in soft clay consolidation process | |
| Kiekbusch et al. | Membrane penetration and its effect on pore pressures | |
| Sun et al. | An experimental study of failure and softening in sand under three-dimensional stress condition | |
| CN111707562B (en) | System and method for testing mechanical properties of rib-grouting body interface | |
| Choi et al. | Development of a true triaxial apparatus for sands and gravels | |
| CN110095347B (en) | Strain control type unsaturated soil three-axis stretching instrument | |
| CN215296902U (en) | Large-scale compression test equipment | |
| CN108505548A (en) | A kind of Piled Embankments stake soil loading ratio experimental rig and test method | |
| CN109060504A (en) | Soil and structure interface testing machine | |
| CN114279818A (en) | Bidirectional flexible loading and unloading ring shear device and test method thereof | |
| CN116297000A (en) | Combined measuring device and method for maximum dry density and bearing ratio of rock and soil | |
| Alarcon et al. | A new apparatus for investigating the stress-strain characteristics of sands | |
| Hoyos et al. | Mechanical testing in unsaturated soils | |
| KR200269540Y1 (en) | Large Cyclic Triaxial Testing Apparatus | |
| KR100397072B1 (en) | Large Cyclic Triaxial Testing Apparatus | |
| CN107664600A (en) | The displacement loading three dimensional taest device and method of shield driving face stability analysis | |
| Voyiadjis et al. | Preparation of large-size cohesive specimens for calibration chamber testing | |
| Lim et al. | An improved rotating cylinder test design for laboratory measurement of erosion in clayey soils | |
| Mitachi | Mechanical behavior of bentonite-sand mixtures as buffer materials | |
| CN210720094U (en) | Testing device for mechanical property changes of formation slurry permeation and formation soil body | |
| AlMikati et al. | The drained response of soft clays reinforced with sand column groups | |
| Corfdir et al. | A cylinder shear apparatus | |
| CN220304935U (en) | Stone sand crushing index tester | |
| CN219935435U (en) | Sample preparation device for large triaxial test sample of coarse-grained soil | |
| El-Kelesh et al. | Calibration chamber modeling of compaction grouting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |