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 testing apparatus capable of simulating overburden pressure of soil, which comprises a test tank, a variable head water tank, a water inlet pipe, a plurality of osmometers, a water outlet pipe and a turbidity meter. The test tank is divided into an upstream buffer area, a test sample area and a downstream buffer area by an upstream porous board and a downstream porous board, wherein a test sample is disposed in the test sample area. The variable head water tank is connected with a water inlet of the upstream buffer area of the test tank through the water inlet pipe. The osmometers are disposed in the test sample as required. The water outlet pipe is disposed at a water outlet of the downstream buffer area, and the turbidity meter is disposed on the water outlet pipe. A steel backing plate capable of sliding up and down is disposed on the upper surface of the test sample. A safety air bag is arranged above the steel backing plate and connected with a pressure source through a pipeline, and a pressure regulating valve is disposed on the pipeline. The large-scale piping testing apparatus integrating the advantages of existing piping testing apparatuses is capable of truly simulating the process of piping development of a large-scale test sample bearing overburden pressure under the coupling 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

Images