Test device and test method for testing strength change of soil body after occurrence of seepage deformation of dykes and dams

Abstract

The invention discloses a test device and a test method for testing strength change of a soil body after occurrence of seepage deformation of dykes and dams. The test device includes a triaxial loading main machine, a confining pressure chamber pedestal, a specimen pedestal, a confining pressure chamber, a specimen, a heat shrinkable pipe, a covering cap, a porous steel plate, an axial pressing rod, a water outlet pipe, a vent hole, a hole pressure sensor, a load displacement sensor, a back pressure controller, a confining pressure controller, a water head control system, and a water-sand separation system. The device has novel design, can simulate influence of seepage deformation of the soil body under actual working conditions with different conditions on the soil body strength, and can realize data automatic recording and processing.

Description

technical field [0001] The invention discloses a triaxial piping device capable of testing the strength change of a dam after seepage deformation, in particular a test method capable of studying the strength change of a dam after seepage deformation under a certain stress condition. Background technique [0002] During the flood season, piping dams are one of the common dangers. Piping refers to the phenomenon that under the action of seepage, the fine particles filled in the pores of the soil skeleton are carried away by water and form seepage channels. [0003] Previous studies have shown that piping is a phenomenon involving complex mechanical behaviors such as pore water flow, particle migration, and deformation of porous media. With the occurrence of piping, the migration of fine particles in the pores leads to the structural adjustment of the soil, resulting in changes in the macroscopic structure and mechanical properties of the soil, such as uneven changes in permea...

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Problems solved by technology

Therefore, in the study of the piping mechanism, the influence of the stress state of the soil must be considered; the change of the shear strength of the soil will cause a safety hazard in the dam, and even lead to a catastrophe of breaking the embankment

[0004] However, at this stage, the experimental devices for the research on the piping mechanism do not or rarely consider the influence of the stress state of the soil and the influence of the change in the strength of the soil after the piping occurs, which leads to the fact that the obtained research results cannot fully and objectively reveal the occurrence and development of the piping. mechanism, seriously affecting the accurate prediction and treatment of embankment piping hazards

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