Piping test device of seepage corrosion stress coupling

Abstract

The invention relates to a piping test device of seepage corrosion stress coupling, wherein a leakage groove is arranged in the base, a pressure chamber is installed on the upper part of the base and a top cover is installed on the upper part of the pressure chamber; one end of the water outlet tube is connected with the bottom outlet of the base and the other end is extended into a measuring pot; a sample is installed in the pressure chamber on the base; a porous steel plate is installed between the sample and the base; a shrinkable tube is closely wrapped on the outside of the sample and a cover cap is arranged at the top part of the sample; a scree filter layer is filled in the cover cap; one end of the axial pressurizing rod is penetrated through the top cover to contact with the cover cap and the other end is connected with an axial pressurizer; a photoelectric sensor is installed on the body of the water outlet tube; a resistance strain gage is installed on the shrinkable tube. The invention researches a piping development process of the soil body under a complex stress state from the seepage corrosion stress coupling aspect, provides a new aspect for the comprehensive understanding of the soil body piping developmental mechanism and also provides an important theoretical basis and a technical support for the prediction and the effective treatment of the dam piping dangerous case.

Description

technical field [0001] The invention relates to a seepage-erosion-stress coupled piping test device, in particular to a test device capable of studying the seepage-erosion-stress coupling mechanism of the undisturbed soil piping development process. Background technique [0002] According to statistics, in the 1990s, the average annual economic loss from floods in my country was 134.31 billion yuan, and it was as high as 255.09 billion yuan in 1998. Floods caused large-scale seepage damage to many dams, among which piping is a very important form of seepage damage. Therefore, it is an urgent applied basic research topic to be solved in the fields of geotechnical engineering and water conservancy and hydropower engineering to carry out relevant research on the mechanism of embankment piping and its development process prediction, and to avoid or effectively control piping damage. sustainable development is of great significance. [0003] Previous studies have shown that pipi...

AI Technical Summary

Problems solved by technology

[0004] However, the existing piping test devices ignore the seepage-erosion-stress coupling effect in the piping development process, and some devices do not consider the soil geometry (porosity), hydraulic (permeability), and mechanical properties caused by the loss of fine particles. (shear strength, etc.), some devices cannot consider the influence of the stress state of the soil on piping

Therefore, the research results cannot comprehensively and objectively reveal the seepage-erosion stress coupling mechanism of piping, which seriously affects the accurate prediction of embankment piping hazards

Images