Large-scale piping testing apparatus capable of simulating overburden pressure of soil and testing method using large-scale piping testing apparatus

Abstract

The invention discloses a large-scale piping test device capable of simulating the overlying pressure of the soil, comprising a sample box, a variable water head water tank, a water inlet pipe, a piezometer, an outlet pipe and a turbidity meter, and the sample box passes through an upstream porous plate and the downstream porous plate are divided into upstream buffer zone, sample area and downstream buffer zone, and the sample is set in the sample area; the variable water head water tank is connected with the upstream buffer zone water inlet of the sample box through the water inlet pipe; the osmometer There are multiple, set in the sample as required; the outlet pipe is arranged at the water outlet of the downstream buffer zone, and the turbidimeter is arranged on the outlet pipe; the upper surface of the sample is provided with a steel pad that can slide up and down The upper part of the steel backing plate is provided with a safety airbag, and the safety airbag is connected with a pressure source through a pipeline, and a pressure regulating valve is arranged on the pipeline. The device of the invention combines the advantages of the existing piping test device, and can truly simulate the piping development process of a large-scale sample bearing overlying pressure under the coupled action of seepage stress.

Description

technical field [0001] The invention relates to a large-scale piping test device and a test method capable of simulating the overlying pressure of soil. Background technique [0002] Piping is a very important form of dam seepage failure. Carrying out related research on the mechanism of dam piping is an urgent applied basic research topic in the fields of geotechnical engineering and water conservancy and hydropower engineering. Sustained development is of great significance. [0003] Piping is a multi-phase multi-field coupling phenomenon involving many complex mechanical behaviors such as pore water seepage, mobile fine particle erosion migration, and porous medium deformation. The stress state and fine particle loss have an important impact on the piping development process. However, the conventional flume piping test device cannot consider the influence of the stress state of the soil on the piping development process, while the model size of the triaxial piping test d...

AI Technical Summary

Problems solved by technology

However, the conventional flume piping test device cannot consider the influence of the stress state of the soil on the piping development process, while the model size of the triaxial piping test device is too small, and there is a large size effect, which cannot correctly reflect the development of soil piping. actual process

Therefore, the research results cannot comprehensively and objectively reveal the development mechanism of piping

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