Testing apparatus for simulating soil piping failure development process and testing method thereof

Abstract

The invention provides a testing apparatus for simulating a soil piping failure development process and a testing method thereof. A variable head water supply system is connected with the bottom of atransparent model case through a feed pipe, a water outlet pipe is arranged at a top of the transparent model case, and a multilayer porous cover plate is spread at the bottom of the transparent modelcase; a saturated transparent soil sample is arranged over the multilayer porous cover plate, a fluorescent agent is added in aperture fluid in the variable head water supply system, a laser is placed outside the transparent model case, a CCD camera is placed outside the transparent model case, and aperture pressure measurement apparatuses are equidistantly arranged in the transparent model case.The effective aperture distribution curves and effective stress distribution under penetration fluid effect of the soil are used for determining whether the soil generates piping failure or not, andthe testing apparatus provides basis for reasonable design of water conservancy structure and geotechnical engineering.

Description

technical field [0001] The invention relates to a piping model test device and a use method, in particular to a test device and a test method for simulating the development process of soil piping damage, and belongs to the field of geotechnical engineering seepage tests. Background technique [0002] In hydraulic engineering and geotechnical engineering, the seepage stability of soil layer is a key scientific issue affecting the safety of buildings. According to the characteristics of local damage caused by seepage fluid, seepage deformation can be divided into two basic forms: flowing soil and piping. Piping refers to the fine soil particles in the soil under the action of seepage in the pore channels formed by coarse soil particles. The phenomenon of moving and being carried out occurs. Engineering practice shows that under the long-term action of high permeable strength, piping may occur in the foundation of the building, the dam body of the dam or its connection with th...

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Problems solved by technology

At present, the numerical simulation technology for judging whether piping will occur under the action of a certain seepage water head generally cannot consider the water-soil interaction caused by particle loss, so it is impossible to accurately judge whether piping occurs, while the existing method for judging the occurrence of piping damage There are many problems in the test method: first, the method is generally based on the scale model, supplemented by relevant detection means, but the information obtained is often the boundary surface (surface) or a small number of discrete points inside the model, and it is impossible to predict the occurrence of piping. The essence is the dynamic and holographic acquisition of fine particle migration and loss laws

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