Triaxial soil sample seepage erosion and shear test device and test method thereof

Abstract

The invention relates to the technical field of soil sample seepage erosion detection, and discloses a triaxial soil sample seepage erosion and shear test device and a test method thereof. The triaxial soil sample seepage erosion and shear test device comprises: a fixing mechanism; a confining pressure mechanism which is used for applying pressure to the soil sample in the horizontal direction; a vertical loading mechanism and a back pressure mechanism which jointly apply uniform and constant pressure to the interior of the soil sample; a seepage mechanism which is used for applying water pressure to the soil sample so as to carry out a seepage erosion experiment on the soil sample; and a particle collecting mechanism which is used for collecting and weighing the falling particles in the soil sample. The device can realize preparation of soil samples with different consolidation confining pressures and initial stress ratios, can realize automatic collection of seepage erosion samples and particles of the soil samples under complex initial stress conditions, and can carry out triaxial shearing mechanical property testing of the seepage erosion soil samples; and the device is favorable for researching the soil internal seepage process, erosion process and mechanical behavior evolution process of infrastructures such as a dam and a side slope in a complex load environment.

Description

technical field [0001] The invention relates to the technical field of soil sample seepage erosion detection, in particular to a detection device and test method for soil sample seepage erosion under triaxial loading conditions and a shear test method for seepage erosion soil samples. Background technique [0002] The foundation soil is prone to seepage erosion under the strong seepage induced by heavy rain, including piping and flowing soil. The specific performance is that the fine particles in the soil pass through the skeleton pores composed of coarse particles under the action of seepage force, resulting in particle loss. In order to describe the macroscopic mechanical behavior of the foundation soil, the indoor test is usually based on triaxial test equipment to test the stress-strain response of the soil under different stress history and state conditions, and then describe the mechanical response of the soil under different service environments . [0003] The exist...

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Problems solved by technology

[0004] Existing triaxial test equipment cannot consider the seepage inside the soil sample and the upstream and downstream hydraulic gradient, and cannot simulate seepage erosion such as particle migration and loss inside the soil sample under the influence of seepage, including piping and soil flow

[0005] The existing one-dimensional seepage test equipment cannot consider the complex stress history and stress state of the real soil, and can only be used to describe the seepage in the soil under the action of one-dimensional seepage, and cannot describe the infrastructure such as dams and slopes under complex load environments. Seepage inside the soil, and the automatic collection of particles cannot be realized

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