Three-dimensional visualization testing device and method for particle seepage migration based on trace method

Abstract

The invention relates to the field of geotechnical engineering model tests, and aims to provide a three-dimensional visualization testing device and method for particle seepage migration based on a trace method. A model casing of the device comprises an upstream liquid level tank, a downstream liquid outlet tank and a model landfill tank; transparent soil particles doped with trace particles inside the model landfill tank is prepared into a dam foundation model, and a dam foundation model is piled and formed at the upper part; and a water bath circulating system consists of a circulating pump,a water bath box, a buffer tank and a plurality of pipelines. The device also comprises the water bath circulating system consisting of the circulating pump, the water bath box, the buffer tank and the pipelines, and a loop is formed by the model box, the buffer tank and the water bath box; and at least two groups of CCD cameras connected to a computer through signal lines respectively are arranged on two sides of the model box respectively. The device effectively solves the problems that a traditional trace particle method is difficult to apply with transparent soil model tests, the occurrence position of particle migration is difficult to capture, the hole fluid refractive index and the glutinousness can change along with temperature and a hole fluid is circulated.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering model tests, in particular to a three-dimensional visualization test device and method for particle seepage migration based on a tracer method. Background technique [0002] The water head difference between the upstream and downstream of the dam will produce a penetrating force on the particles in the dam. Under the action of this force, the particles in the dam will migrate, and in severe cases, a through seepage channel will be formed, resulting in sand boiling and piping in the dam. Nearly 40% of our country's dam damage is caused by this. It is of great significance to study the particle migration mechanism of embankments. However, the particle migration under the action of seepage is a phenomenon that occurs inside the soil, and it is difficult to realize the effective observation of this phenomenon by the traditional test device method. [0003] In recent years, the transparent soi...

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Problems solved by technology

The reasons are as follows: (1) The migration of particles under osmosis is relatively random, and it is difficult to capture the location of the migration by the traditional laser irradiation method for transparent soil; It is difficult to apply the two-dimensional PIV tracer particle method in the transparent soil test; (3) It needs to continuously supply pore fluid, and the refractive index and viscosity of pore fluid will change with temperature, which leads to unsatisfactory observation and seepage simulation results; (4 ) The cost of pore fluid is higher

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