Penetration and corrosion triaxial testing apparatus for gravel soil and testing method thereof

Abstract

The invention provides a penetration and corrosion triaxial testing apparatus for gravel soil. The penetration and corrosion triaxial testing apparatus comprises a pressure control system, a penetration and corrosion triaxial testing system and a sand-water separation system, wherein the penetration and corrosion triaxial testing system is used for containing gravel soil samples and can form a penetration and corrosion environment with a multistage water head and complex stress condition through self-loaded axial pressure as well as confining pressure and water pressure, provided by a pressure supplying system; the contained gravel soil samples can flow out of the penetration and corrosion triaxial testing system in the penetration and corrosion environment and then enter the sand-water separation system. The invention also provides a testing method of the triaxial testing apparatus. According to the triaxial testing apparatus, the samples are placed in a pressure chamber with confining pressure to be saturated, so that the multistage water head can realize penetration, corrosion and strength testing under a condition that the real environment stress state is simulated; corroded particles are discharged through a porous chassis of the pressure chamber, the mass of the corroded particle can be weighed in real time after sand-soil separation, and the penetration and corrosion triaxial testing process with the multistage water head and the complex stress condition can be effectively carried out.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a gravel soil seepage erosion triaxial test device and test method for the change of gravel soil permeability characteristics and mechanical strength under seepage erosion (latent erosion) conditions. Background technique [0002] Erosion phenomena such as concentrated seepage erosion, retreat erosion, contact erosion and subsurface erosion can all lead to internal seepage erosion of rock and soil. Latent corrosion is the selective erosion of fine particles inside the coarse-grained framework under the action of seepage water. For rocks and soils that are prone to erosion, once the fine particles move, the corresponding mesostructure of the rocks and soils will change, the shear strength will decrease accordingly, and the internal hydraulic conditions will also change abruptly. Many rockfill dam failures and geological disasters are closely related to subsurface...

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Problems solved by technology

[0005] The purpose of the present invention is to place the sample under the condition of self-weight for the traditional fine-grained soil penetration test method, which cannot simulate erosion under multi-level water head and complex stress conditions, and the collection efficiency of erosion particles is low. Insufficient, to provide a triaxial test device and test method for seepage and erosion of large-sized gravel soil that can simulate multi-level water head and complex stress conditions, and simulate the erosion process

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