Hydraulic servo system for on-site in-situ direct shear experiment of rock-soil body

Abstract

The utility model provides a hydraulic servo system for an on-site in-situ direct shear experiment of a rock-soil body, which comprises a hydraulic servo device, a hydraulic integration device, an integration distributor and a jack, the hydraulic servo control device can provide uniform-speed loading power for an oil supply system of the hydraulic integrated device at fixed time intervals through real-time digital transmission of software, and it is guaranteed that the system can control uniform-speed loading of the jack. The hydraulic integration device is connected with the hydraulic servo control device through a transmission line; the multi-strand oil way integrated distributor is connected with the two jacks, so that one hydraulic integrated device controls the two jacks to generate loads in different directions at the same time, power is provided for the whole hydraulic loading system, and the hydraulic integrated device is a loading device for converting the power provided by the hydraulic integrated device into a rock-soil body in-situ shear experiment. The system can ensure that the pressurization uniform speed and the time interval of the in-situ shear experiment are controlled, an allowable error value specified by a reconnaissance scheme and a specification is achieved, and the data accuracy of the in-situ direct shear experiment is improved.

Description

Technical Field

[0001] This utility model belongs to the field of slope investigation engineering technology, specifically a hydraulic servo system for automatically controlling the normal and shear pressures during in-situ direct shear tests on rock (soil) slopes. Background Technology

[0002] Currently, in rock (soil) slope investigation projects, in-situ direct shear tests require applying normal and shear pressures to the test specimens based on their cohesion, according to different lithologies. Multiple, multi-stage pressure applications are performed at fixed intervals for the maximum normal and shear loads. Automatic time control via a hydraulic servo system reduces errors caused by the difficulty in controlling the uniformity of time and pressure, thus meeting the allowable error values ​​specified in the investigation plan and standards. In a specific slope investigation example, the investigation plan requires the in-situ direct shear test to apply normal loads at levels 1-3, with each level lasting 5 minutes, and shear loads at levels 8-12, with each level lasting 10 minutes. To better control the uniformity of pressure application and time in the in-situ shear test to meet the requirements of the standards and plan, this utility model was developed. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies in the prior art, in order to solve the problems existing in the prior art, this utility model provides a hydraulic servo system for in-situ direct shear tests of soil and rock.

[0004] Its main technical solution is: a hydraulic servo system for in-situ direct shear tests of rock and soil, including: a hydraulic servo control device, a hydraulic integrated device, a jack, and an oil circuit integrated distributor. The hydraulic servo control device is connected to the hydraulic integrated device through a transmission line, and the hydraulic integrated device is connected to the jack through the oil circuit integrated distributor.

[0005] Furthermore, the oil circuit integrated distributor has multiple channels, and there are two jacks.

[0006] Furthermore, the hydraulic integrated device is provided with an oil inlet A and an oil inlet B on its top.

[0007] Furthermore, the oil circuit integrated distributor includes a return oil pipe and an inlet oil pipe.

[0008] The beneficial effects of this utility model are as follows:

[0009] This utility model discloses a hydraulic servo system for in-situ direct shear tests of soil and rock. It is easy to install and highly automated, and can ensure that the pressurization rate and time interval of the in-situ shear test are controlled, achieving the allowable error value specified in the exploration plan and specifications, thereby improving the accuracy of the data from the in-situ direct shear test.

[0010] ① When data deviations occur in the in-situ direct shear test, the hydraulic servo control device's memory function can be used to verify and correct the experimental loading data. By inputting the maximum normal load and maximum shear load values, loading stages, and time intervals, the entire in-situ direct shear test can be controlled in a standardized and precise manner.

[0011] ② It is simple and convenient to use, and one person can control the pressure system for in-situ direct shear experiments.

[0012] ③ It can simultaneously control the terminals of two jacks that apply normal and shear loads through a multi-strand integrated distributor. Attached Figure Description

[0013] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0014] Figure 1 This is a schematic diagram of the installation for the in-situ shear test of this utility model;

[0015] Figure 2 This is a schematic diagram of the hydraulic servo system for the in-situ direct shear experiment of this utility model;

[0016] Figure 3 This is a schematic diagram of the in-situ direct shear test of this utility model.

[0017] The components include: 1. Anchor bolt counter-tensioning device; 2. Force transmission system; 3. Jack; 4. Pressure gauge; 5. Bearing plate; 6. Roller assembly; 7. Lateral rock mass support; 8. Shear box; 9. Soil and rock specimen; 10. Structural surface; 11. Hydraulic servo control device; 12. Transmission line; 13. Oil inlet A; 14. Oil inlet B; 15. Hydraulic integrated device; 16. Return oil pipe; 17. Oil supply pipe; 18. Oil circuit integrated distributor; 19. Data acquisition instrument. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This utility model discloses a hydraulic servo system for in-situ direct shear testing of soil and rock. To make the advantages of the hydraulic servo system for in-situ direct shear testing clearer, the following will provide a complete and clear description of the examples in conjunction with the accompanying drawings.

[0020] This utility model discloses a hydraulic servo system for in-situ direct shear testing of soil and rock masses, such as... Figure 1 Includes: a hydraulic servo control device 11, a hydraulic integrated device 15, a multi-channel oil circuit integrated distributor 18, and a jack 3.

[0021] The hydraulic servo control device 11 is an electronic control device, located at the front of the entire system. It provides uniform loading power to the oil supply system of the hydraulic integrated device 15 at fixed time intervals via real-time digital transmission through software, ensuring that the system can control the uniform loading of the jacks 3. The hydraulic integrated device 15 is connected to the hydraulic servo control device 11 via transmission line 12. The hydraulic integrated device 15 is connected to two jacks 3 via a multi-channel oil circuit distributor 18, enabling one hydraulic integrated device 15 to simultaneously control two jacks 3 to generate loading in different directions, providing power to the entire hydraulic loading system. The oil circuit distributor 18 includes a return oil pipe 16 and an upper oil pipe 17. The jacks 3 are located at the end of the entire hydraulic servo system and are used to convert the power provided by the hydraulic integrated device into a loading device for in-situ shear tests on soil and rock.

[0022] Example:

[0023] like Figure 2 As shown, a hydraulic servo system for in-situ direct shear tests of soil and rock masses includes a hydraulic servo control device 11, a hydraulic integrated device 15, an oil circuit integrated distributor 18, and jacks 3. The hydraulic servo control device 11 is connected to the hydraulic integrated device 15 via a data transmission line 12 and is placed on a flat operating table. The normal jacks 3 and the tangential jacks 3 are connected to the hydraulic integrated device 15 via an upper oil pipe 17 and a return oil pipe 16 and are placed in the soil and rock foundation pit of the test.

[0024] When the hydraulic servo control device 11 inputs commands via a computer or mobile terminal, including the maximum normal load, the number of normal loading stages, the normal loading interval time, the maximum tangential load, the number of tangential loading stages, and the tangential loading interval time, and the data input of the hydraulic servo control device 11 is confirmed, the hydraulic integrated device 15 will control the flow direction of the hydraulic oil supply and return according to the input commands, thereby completing the control of the pressure state of the jack 3. The data acquisition instrument 19 will record the elongation and feed it back to form the hydraulic servo system program control record output.

[0025] The system defaults to executing the normal loading command first. Only after the normal load stabilizes and the hydraulic oil flows back to the hydraulic pump of the hydraulic integrated device 15 will the tangential loading command be executed.

[0026] After inputting the maximum normal load, number of normal loading stages, and normal loading interval for the soil and rock specimens required for the in-situ shear test, the hydraulic integrated device 15 will complete multi-stage loading through the multi-channel oil circuit integrated distributor 18. After each loading stage, the normal displacement under each load stage should be recorded immediately by the dial gauge installed in the laboratory. After the normal load of the hydraulic servo system of the in-situ direct shear test is completed, the normal displacement after the loading is completed should be continuously measured. When the difference between two consecutive normal displacement measurements is not greater than 0.01 mm, the shear load can be applied.

[0027] After inputting the maximum tangential load, loading stages, and tangential loading interval for the soil and rock specimens used in the in-situ shear test, the hydraulic integrated device will complete multi-stage loading through the multi-channel oil circuit integrated distributor 18. After each loading stage, the tangential displacement under each load stage should be measured immediately using a dial gauge installed in the laboratory. During the shearing process, the normal stress should always remain constant. When the tangential load is applied to the maximum shear resistance of the soil and rock specimen 9, the structural surface 10 of the specimen will undergo a shear response. The hydraulic servo system of the in-situ direct shear test will continue to apply the shear load according to the original tangential time interval and the equal division of the maximum normal load until a stable shear load value is measured.

[0028] After the experiment, the jack elongation output by the hydraulic servo system program control record and the coefficients of pressure gauge 4 and jack 3 of the hydraulic integrated device recorded in the experiment were compared with the equal division value of the input maximum load through the calibration calculation formula to further ensure the accuracy of the experiment.

[0029] The experimental data were used to conduct in-depth research on the shear force, cohesion, and internal friction angle of specimens with different lithologies at failure, providing reliable data for slope stability analysis.

[0030] When no load is required in the normal or tangential direction during the experiment, simply fill in 0 on the data input page.

[0031] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A hydraulic servo system for in-situ direct shear testing of soil and rock masses, comprising: The hydraulic servo control device (11), the hydraulic integrated device (15), the jack (3), and the oil circuit integrated distributor (18) are characterized in that: the hydraulic servo control device (11) is connected to the hydraulic integrated device (15) through a transmission line (120), and the hydraulic integrated device (15) is connected to the jack (3) through the oil circuit integrated distributor (18).

2. The hydraulic servo system for in-situ direct shear testing of soil and rock mass according to claim 1, characterized in that: The oil circuit integrated distributor (18) has multiple branches, and the jacks (3) are two in number.

3. The hydraulic servo system for in-situ direct shear testing of soil and rock mass according to claim 1, characterized in that: The hydraulic integrated device (15) is provided with an oil inlet A (13) and an oil inlet B (14) on its top.

4. The hydraulic servo system for in-situ direct shear testing of soil and rock mass according to claim 1, characterized in that: The oil circuit integrated distributor (18) includes a return oil pipe (16) and an upper oil pipe (17).

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