Large-scale real triaxial shear testing device and application thereof

Abstract

The invention relates to a large-scale real triaxial shear testing device and an application thereof. The testing device comprises a testing box, a hydraulic pressurization mechanism and a water pressure pressurization mechanism, wherein the testing box comprises a box frame, a shear box and a soil pocket; the hydraulic pressurization mechanism comprises a hydraulic control box, a vertical hydraulic cylinder, a horizontal hydraulic cylinder and a shear testing hydraulic cylinder; the water pressure pressurization mechanism comprises a water box, a gas pressure tank and a water pressure pocket; the hydraulic control box is used for controlling the pressure of the vertical hydraulic cylinder and the horizontal hydraulic cylinder, the gas pressure tank is used for controlling the pressure of the water pressure pocket and enabling a test sample in the soil pocket to be in a three-dimensional stress state, shear testing is performed on the test sample through the shear testing hydraulic cylinder, whether the test sample has drainage or not is controlled through a drainage valve, and the changes in displacement over time and the changes of pressure applied in each direction over the time are recorded when the test sample is sheared. Compared with the prior art, the large-scale real triaxial shear testing device provided by the invention has the characteristics that the size of the test sample is large, a shear surface is not a traditional fixed horizontal plane, the large-scale real triaxial shear testing device can be used for shear testing of soil in a three-dimensional stress state, and parameters of a soil layer can be determined more accurately.

Description

technical field [0001] The invention belongs to the field of rock and soil tests, and in particular relates to a large-scale true triaxial shear test device and its application, and is especially suitable for measuring the basic mechanical parameters of various coarse and fine-grained soil samples under a three-dimensional stress state. Background technique [0002] In the field of geotechnical engineering, the failure of soil is usually shear failure. The bearing capacity of building foundations, the earth pressure of retaining walls and underground structures, and the stability of various slopes are all controlled by the shear strength of the soil. Whether the shear strength of the soil can be obtained correctly is often the key to the success of a project. The essential. [0003] The direct shear test is a routine method for determining the shear strength of soil. At present, many scholars use different direct shear test devices to measure the shear strength of soil. ...

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Problems solved by technology

[0008] The shear interface of the test device in the above patent is fixed, and there is a size effect, so it is not suitable for the shear test of the soil under the three-dimensional stress state

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