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

A technology of penetration deformation and strength change, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve problems such as disasters of embankments, potential safety hazards, and the inability to comprehensively and objectively reveal the mechanism of piping development

Inactive Publication Date: 2015-08-12
HOHAI UNIV
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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 ...

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

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, device of the present invention is described in further detail:

[0024] Such as figure 1 Shown: a piping triaxial tester for testing the change of soil strength after the seepage deformation of the embankment, the base 15 of the confining pressure chamber is arranged on the triaxial loading main machine; the sample 13 and the sample base 16 are placed on the base 15 of the confining pressure chamber, The sample 13 is connected to the sample base 16 through a porous water-permeable copper plate 11; the upper end of the sample 13 is connected to the sample cap 8 through a water-permeable sand-permeable copper plate; the sample cap 8 is connected to the axial dowel rod 3, the applied load and the The displacement is measured by the load displacement sensor 2, which is connected to the triaxial loading host to monitor the axial force and axial deformation of the sample in real time; a pore pressure sensor is arranged at the w...

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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...

Claims

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Application Information

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IPC IPC(8): G01N3/10
Inventor 陈亮丁小闯胡海星文磊李月奇
Owner HOHAI UNIV
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