Large direct shear apparatus capable of achieving isotropic movement in three-dimensional space and test method thereof

Abstract

The invention discloses a large direct shear apparatus capable of achieving isotropic movement in a three-dimensional space and a test method of the large direct shear apparatus. The direct shear apparatus comprises a test bed rack, an electric control cabinet, a working platform, a loading device, a horizontal displacement constraint device, a movement actuating mechanism, upper and lower shear boxes, a grid pressing piece and a bearing plate, wherein the electric control cabinet, the horizontal displacement constraint device, the movement actuating mechanism and a supporting device are arranged on the test bed rack; the loading device applies vertical pressure to the upper shear box, the grid pressing piece and the lower shear box by virtue of the bearing plate; the horizontal displacement constraint device is connected with the upper shear box; geosynthetics to be subjected to a shear test are circular and are arranged between the grid pressing piece and the lower shear box; the movement actuating mechanism drives the lower shear box to perform spatial three-dimensional movement; and the electric control cabinet is connected with the loading device and the movement actuating mechanism. According to the large direct shear apparatus disclosed by the invention, the problems that only a uniaxial shear test can be performed, the shear direction is optional, the large size cannot be realized, and the test result cannot really reflect the engineering practice in a conventional direct shear apparatus are solved.

Description

technical field

[0001] The invention belongs to the field of testing the mechanical properties of geosynthetic materials, and relates to an anisotropic direct shear instrument for geosynthetic materials and a test method thereof, in particular to a large-scale direct shear instrument capable of moving in all directions in three-dimensional space and a test method thereof. Background technique

[0002] Geosynthetics are placed inside the soil, on the surface or between various soils to protect or strengthen the soil, so they are widely used. "And other specifications have mentioned the geosynthetics direct shear device. At present, the existing direct shear device can only do the "reinforcement-soil" direct shear test of small samples in one direction. The sample shear direction is random, the load is light, and the shear area is small. Generally, it can only contain geosynthetic There are several grid holes in the material, and the mechanical properties obtained from the te...

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