CN216791895U - Load test device with controllable confining pressure - Google Patents
Load test device with controllable confining pressure Download PDFInfo
- Publication number
- CN216791895U CN216791895U CN202220342635.XU CN202220342635U CN216791895U CN 216791895 U CN216791895 U CN 216791895U CN 202220342635 U CN202220342635 U CN 202220342635U CN 216791895 U CN216791895 U CN 216791895U
- Authority
- CN
- China
- Prior art keywords
- sample
- test
- confining pressure
- pressure control
- load
- 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 invention discloses a confining pressure controllable load test device which comprises a loading equipment system, at least four confining pressure control systems and a measuring equipment system, wherein the four confining pressure control systems are connected with the loading equipment system; the loading equipment system provides vertical test load for the test sample from the top of the test sample; a confining pressure control system is respectively arranged in the central area of each side surface of the sample, one end of the confining pressure control system is tightly propped against the side surface of the sample, and the other end of the confining pressure control system is tightly propped against the lateral reverse force application device to provide lateral limiting pressure for the side surface of the sample; the measuring equipment system is used for measuring the displacement change of the test sample under the vertical test load. The invention can realize the control of the lateral limiting pressure of the sample by controlling the lateral limiting pressure of the sample; the stress of the sample is matched with the indoor test, and the indoor test result can be better applied to engineering practice.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a confining pressure controllable load test device.
Background
The strength and deformation characteristics of rock-soil mass are usually obtained by indoor compression test and on-site in-situ load test. However, for gravel soil, because the particle size is large, and because the size of an instrument is limited in an indoor compression test, a reduced scale test is usually adopted, and the strength of an undisturbed soil body cannot be completely reflected; the confining pressure of the sample cannot be measured in the field in-situ load test, the test cost is high, the time consumption is long, and the factors influencing the in-situ test result are complex, so that the accurate determination of the measured value is difficult to a certain extent, and the in-situ test result cannot be matched with the indoor compression test result.
Therefore, the rock body in-situ load test device and method with controllable boundaries and capable of determining the confining pressure are provided, the confining pressure of the sample is obtained through controlling the large main stress of the soil body around the sample, the result can be matched with the indoor test result, and then the empirical parameters are obtained. It is necessary to determine the strength and deformation characteristics of rock mass quickly and reasonably in water conservancy and hydropower engineering, foundation and foundation engineering and slope engineering.
Disclosure of Invention
The invention aims to provide a load test device for controlling the confining pressure of a sample, which is used for overcoming the defect that the confining pressure of the sample cannot be mastered in the test process by the traditional load test device and the test method, so that the in-situ test result is matched with the indoor test result.
In order to achieve the purpose, the technical scheme provided by the invention is a confining pressure controllable load test device which comprises a loading equipment system, at least four confining pressure control systems and a measuring equipment system; the loading equipment system provides vertical test load for the test sample from the top of the test sample; a confining pressure control system is respectively arranged in the central area of each side surface of the sample, one end of the confining pressure control system is tightly propped against the side surface of the sample, and the other end of the confining pressure control system is tightly propped against the lateral reverse force application device to provide lateral limiting pressure for the side surface of the sample; the measuring equipment system is used for measuring the displacement change of the test sample under the vertical test load.
Preferably, the top and the side of the sample are respectively provided with a roller row, and the loading equipment system and the confining pressure control system are respectively abutted against the roller rows.
Preferably, the loading equipment system and the confining pressure control system respectively comprise a force transmission column and a hydraulic device connected with the force transmission column, and a pressure gauge for testing pressure is arranged on the hydraulic device.
Preferably, a base plate is arranged at the bottom of a hydraulic device of the loading equipment system, and a pressure transmission plate is arranged at the top of the pressure transmission column; the pressure transmission plate of the loading equipment system is positioned above the roller row, and the pressure transmission plate at the top of the force transmission column is tightly propped against the top reverse force application device capable of applying reverse action.
Preferably, a base plate is arranged at the top of a hydraulic device of the confining pressure control system, and a force transmission plate is arranged at the top of the force transmission column; and a pressure transmission plate of the confining pressure control system is positioned on the roller row, and a base plate at the top of the hydraulic device is tightly propped against a lateral reverse force application device capable of applying reverse action.
Preferably, the hydraulic means is at least one hydraulic jack.
Preferably, a cement mortar layer is paved on the upper surface of the sample and the side surface of the sample, a backing plate is paved on the cement mortar layer, and the roller row is positioned on the backing plate.
Preferably, the roller row comprises two parallel backing plates, and a plurality of rows of rollers are arranged between the backing plates in parallel.
The invention has the beneficial effects that:
(1) the invention can realize the control of the lateral limit pressure of the sample by controlling the large main stress of the surrounding rock-soil mass.
(2) The invention can match the stress of the sample with the indoor test by controlling the lateral limit pressure of the sample, and the indoor test result can be better applied to the engineering practice.
(3) The invention can apply various test schemes, save cost, improve efficiency, ensure precision, attach the real mechanical behavior of the sample, solve the value problem of strength and deformation parameters, and has simple and quick engineering application.
Drawings
FIG. 1 is a schematic elevational view of a load testing apparatus of the present invention.
FIG. 2 is a schematic top view of a sample and confining pressure control system of the load testing apparatus of the present invention.
Detailed Description
For the above technical solution, a preferred embodiment is specifically described with reference to the drawings, and refer to fig. 1 and 2.
The confining pressure controllable load test device comprises a loading equipment system, at least four confining pressure control systems and a measuring equipment system; the loading equipment system provides a vertical test load for the test sample from the top of the test sample; a confining pressure control system is respectively arranged in the central area of each side surface of the sample, one end of the confining pressure control system is tightly propped against the side surface of the sample, and the other end of the confining pressure control system is tightly propped against the lateral reverse force application device to provide lateral limiting pressure for the side surface of the sample; the measuring equipment system is used for measuring the displacement change of the test sample under the vertical test load.
The loading equipment system comprises a force transmission column 7, wherein force transmission plates 6 are respectively arranged on the top end and the bottom end of the force transmission column 7, and the force transmission plates 6 can be fixedly or detachably arranged on the force transmission column, such as in a welding mode or in a bolt connection mode. The area of the pressure transmission plate 6 is larger than that of the force transmission column, and the center of the pressure transmission plate is overlapped with that of the force transmission column. And the pressure transmission plate 6 at the top of the force transmission column is used for propping against a reverse cross beam 8 on the top reverse force application device and applying reverse acting force downwards through the reverse cross beam on the top reverse force application device. The purpose of the pressure transmitting plate 6 having a larger area than the end of the pressure transmitting column is to distribute the pressure-bearing force over a larger area. Typically, the top counter-force means is a trial hole top. A hydraulic device 4 is arranged below the pressure transmission plate at the bottom end of the pressure transmission column, a pressure gauge 5 is arranged on the hydraulic device 4, and a base plate 3 is arranged at the bottom of the hydraulic device 4. The hydraulic device 4 is a hydraulic jack, can be provided with one, two, three or more hydraulic jacks as required, when the hydraulic jack is more than two, the distance of simultaneous jacking of more than two hydraulic jacks and the output force are the same, and the level and the stress of the base plate 3 and the pressure transmission plate 6 are uniform. The backing plate 3, the pressure transmission plate 6, the force transmission column 7 and the reverse beam 8 are made of high-strength metal materials, such as steel materials.
The confining pressure control system comprises a hydraulic device 4, and a pressure gauge 5 is arranged on the hydraulic device 4. The hydraulic device 4 is a hydraulic jack. Two ends of the hydraulic jack are respectively provided with a backing plate 3 for abutting against the side surface of the sample and a lateral reverse force application device 10. During testing, the confining pressure control systems are generally four and are respectively distributed right outside four side surfaces of the sample.
The base plate, the pressure transmission plate, the force transmission column, the reverse cross beam and the like are all made of high-strength metal materials, such as steel materials.
The measuring equipment system comprises a dial indicator and a meter frame (not shown) and is used for measuring the sinking distance of the sample.
Before the test, a square accommodating cavity is dug on the ground, a sample 1 is laid in the central area of the square accommodating cavity, and after the sample 1 is laid by rolling, a layer of cement mortar is laid on the upper surface and the side surface of the sample respectively, so that the upper surfaces of the cement mortar are parallel and level. The sample 1 and the square accommodating cavity are arranged in parallel on the side face, and a space for accommodating the confining pressure control system is reserved between the side face of the sample 1 and the side face of the square accommodating cavity. The lateral side of the square accommodating cavity is the lateral reverse force application device 10.
A layer of roller row 2 is laid on the upper surface of the sample 1 and the cement mortar on each side surface. The roller row comprises two steel base plates which are arranged in parallel at intervals, a plurality of rows of rollers are arranged in parallel at intervals between the two base plates, and the rollers can rotate relative to the base plates. When the sample is laterally displaced under the action of load, the roller row can rotate along with the lateral displacement of the sample, so that the buffer purpose is achieved, and the hydraulic device is prevented from toppling.
A loading equipment system is arranged at the center position right above the sample 1, the top of the loading equipment system is tightly propped against a top reverse force application device, namely the top of the test hole, and a bottom base plate 3 of the loading equipment system is tightly propped against a roller row 2.
Then, a confining pressure control system is respectively arranged between the four side surfaces of the sample 1 and the side surfaces of the square containing cavity, a base plate 3 at one end of each confining pressure control system is tightly propped against the roller row 2, and a base plate 3 at the other end is tightly propped against the side surfaces of the square containing cavity, namely, the lateral reverse force application device. The bottom of the confining pressure control system is opposite to the central area of the side surface of the sample.
And determining the maximum load to be loaded by the loading equipment system and the lateral load to be loaded by the confining pressure control system. First, the hydraulic devices of the confining pressure control systems are adjusted to output a determined lateral load to each side of the sample.
And then, the maximum load which is determined to be loaded by the loading equipment system is applied to the sample 1 in a grading manner through the loading equipment system, and the vertical load sinking condition and the sinking data of the sample at the viewing side of the loading equipment system are measured.
The load test device disclosed by the invention can be used for applying the vertical load step by step under the condition of providing the lateral limit pressure required by the sample, so that the in-situ load test result is matched with the indoor load test result, and the accuracy of the in-situ load test is ensured.
Claims (8)
1. A confining pressure controllable load test device is characterized by comprising a loading equipment system, at least four confining pressure control systems and a measuring equipment system; the loading equipment system provides vertical test load for the test sample from the top of the test sample; a confining pressure control system is respectively arranged in the central area of each side surface of the sample, one end of the confining pressure control system is tightly propped against the side surface of the sample, and the other end of the confining pressure control system is tightly propped against the lateral reverse force application device to provide lateral limiting pressure for the side surface of the sample; the measuring equipment system is used for measuring the displacement change of the test sample under the vertical test load.
2. The load testing device according to claim 1, wherein the top and the side of the sample are respectively provided with a roller row, and the loading equipment system and the confining pressure control system are respectively abutted against the roller rows.
3. The load test device according to claim 1, wherein the loading equipment system and the confining pressure control system respectively comprise a force transmission column and a hydraulic device connected with the force transmission column, and a pressure gauge for testing pressure is arranged on the hydraulic device.
4. The load test device according to claim 3, wherein a base plate is arranged at the bottom of the hydraulic device of the loading equipment system, and a pressure transmission plate is arranged at the top of the force transmission column; the pressure transmission plate of the loading equipment system is positioned above the roller row, and the pressure transmission plate at the top of the force transmission column is tightly propped against the top reverse force application device capable of applying reverse action.
5. The load test device according to claim 3, wherein a base plate is arranged at the top of the hydraulic device of the confining pressure control system, and a pressure transmission plate is arranged at the top of the force transmission column; and a pressure transmission plate of the confining pressure control system is positioned on the roller row, and a base plate at the top of the hydraulic device is tightly propped against a lateral reverse force application device capable of applying reverse action.
6. A load testing device according to claim 3, wherein said hydraulic means is at least one hydraulic jack.
7. A load testing apparatus according to claim 2, wherein a layer of cement mortar is laid on the upper surface of the test specimen and on the side surface of the test specimen, a backing plate is laid on the cement mortar layer, and the roller row is located on the backing plate.
8. A load testing device according to claim 7, wherein said row of rollers comprises two parallel pads, and a plurality of rows of rollers are arranged in parallel between said pads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220342635.XU CN216791895U (en) | 2022-02-21 | 2022-02-21 | Load test device with controllable confining pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220342635.XU CN216791895U (en) | 2022-02-21 | 2022-02-21 | Load test device with controllable confining pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216791895U true CN216791895U (en) | 2022-06-21 |
Family
ID=82018986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220342635.XU Active CN216791895U (en) | 2022-02-21 | 2022-02-21 | Load test device with controllable confining pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216791895U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118294261A (en) * | 2024-05-13 | 2024-07-05 | 中国铁路成都局集团有限公司重庆建设指挥部 | Method for testing shear strength and damage mode of grouting body indoors |
-
2022
- 2022-02-21 CN CN202220342635.XU patent/CN216791895U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118294261A (en) * | 2024-05-13 | 2024-07-05 | 中国铁路成都局集团有限公司重庆建设指挥部 | Method for testing shear strength and damage mode of grouting body indoors |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112761199B (en) | High-rise deviation-correcting static pressure anchor pile and broken pile underpinning supporting device and monitoring method thereof | |
| CN109868849B (en) | Pile-soil interaction visual test device and test method thereof | |
| CN113109176B (en) | Joint rock mass in-situ shearing test device and method for relaxation process detection | |
| CN110554169A (en) | tunnel excavation process simulation test device and method | |
| CN101650286A (en) | Bedding coefficient testing method | |
| CN111287227A (en) | Method and device for testing side frictional resistance of gravel soil high-fill foundation pile | |
| CN216791895U (en) | Load test device with controllable confining pressure | |
| JP3871087B2 (en) | In-situ rock mass shear strength test apparatus and method | |
| CN219240651U (en) | Pile driving confining pressure grading loading model test device | |
| CN108535113B (en) | Comprehensive determination method for deformation parameters of horizontal stratified rock mass | |
| CN110411804B (en) | Test sample for mechanical properties of contact surface of soil body and structure, preparation method and test method | |
| CN110117968B (en) | 4000 t-level pile foundation vertical compression-resistant static load test method | |
| CN216791897U (en) | Load test device for providing lateral limit for large main stress | |
| CN110132714B (en) | Device and method for testing deformation parameters of irregular rock mass sample | |
| CN114323982A (en) | Load test device and method for providing lateral limit for large main stress | |
| CN106989998B (en) | Loading device for detecting interlocking performance of concrete interlocking block and application method | |
| CN106368202B (en) | A kind of load testing method | |
| CN110108576A (en) | Screw model stake and ground contact surface shear strength index determining device | |
| Vijayvergiya et al. | Load distribution for a drilled shaft in clay shale | |
| CN215296993U (en) | Multi-connected rock-soil in-situ shear testing device for full-stress path tracking | |
| CN217358824U (en) | Large-section rectangular jacking pipe frictional resistance testing system | |
| KR20060134505A (en) | Bi-directional double-acting, hollow, highly pressured pile load test and construction method of axial load distribution in case of existing bddhh plt device in the middle of a pile | |
| CN108613652A (en) | The experimental rig and method of scar irregularity degree are simulated in anchor pole test | |
| CN110057653A (en) | One kind is built a wall strength simulation detection method | |
| CN110409519B (en) | Device and method for testing bearing capacity of super-large-diameter end bearing pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |