Test device for exerting different constraints on soil unit

Abstract

The invention discloses a test device of a soil unit test piece. A side press plate is uniformly arranged on the outer side of a soil sample test piece to be tested arranged in a soil sample holding table groove; meanwhile, a sliding device capable of sliding and being fixed is arranged at the outer side of a loading device; the loading device is used for exerting a load on the top surface of thesoil unit test piece, and simultaneously performs different constraints on the opposite side, third side and fourth side of the soil unit test piece; the constraints at the identical sampling positionare exerted on the test soil unit test pieces according to the constraint conditions received by the soil unit in the roadbed sampling position; the test on force in different directions of the soilsample test piece to be tested can be realized, so that the soil sample test piece to be tested is naturally stressed. The device has the advantages that the structure is simple; the soil unit test piece can be subjected to direct shearing test under the constraint conditions; in addition, the shearing surface of the soil unit test piece is enabled to be always in contact with the soil body in thesharing process; the Poisson's ratio of the soil sample is measured through measuring the peripheral deformation and vertical deformation of the soil unit test piece; the measuring authenticity of the soil unit test piece is effectively improved.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and relates to a soil unit test piece testing device. Background technique [0002] Indoor compression test and shear test are common tests in geotechnical tests to determine the deformation and strength of soil samples, and are used to analyze the settlement of building foundations and roadbeds and determine the parameters of stability. The conventional method of indoor compression test is to place the soil sample in the ring knife and place it in a rigid container to apply vertical load, so that the soil sample is subjected to compression test under the condition of complete rigid confinement, and the soil sample is not considered in the test process. Lateral deformation, which is inconsistent with the force and deformation conditions of the flexible soil material around the soil unit in actual engineering. At present, the shearing test device in the geotechnical test is a circular stan...

AI Technical Summary

Problems solved by technology

The conventional method of indoor compression test is to place the soil sample in the ring knife and place it in a rigid container to apply vertical load, so that the soil sample is subjected to compression test under the condition of complete rigid confinement, and the soil sample is not considered in the test process. Lateral deformation, which is inconsistent with the force and deformation conditions of the soil material around which the soil element is flexible in actual engineering

At present, the test device for shearing in geotechnical tests is a circular standard shearing box, and the shearing area gradually decreases with the shearing, and there are errors in the test results.

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