A test device and method for the influence of flooding-underground erosion coupling effect on soil mechanical properties

Abstract

The invention provides a test device and method for the influence of water immersion-underground corrosion coupling on soil mechanical properties, belonging to the technical field of geotechnical engineering. The test device includes a pressure system, a water supply system, a sand-water separation measurement system and an automatic confining pressure system: the pressure system is used to place soil samples and form a mechanical test environment; the water supply system is used to provide water sources to form an environment for immersion and subterranean corrosion; automatic confining pressure The system is used to provide confining pressure and test the volume change of soil samples; the sand-water separation measurement system is used to collect lost particles and weigh them. The corresponding test method of the present invention is as follows: for each group of soil samples, treatment with different immersion time is performed first, and then treatment with different burrowing time is performed, and then the mechanical properties of soil samples under different stress paths are tested to study immersion, burrowing and two The influence of the coupling effect on the mechanical properties of soil. The device and method of the present invention can independently control the soil water immersion and the subsurface erosion treatment to study the influence of the two and their coupling effects on the soil mechanical properties.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a test device and a test method for carrying out the influence of water immersion and submerged corrosion coupling on soil mechanical properties. Background technique [0002] Nowadays, landslide geological disasters occur frequently in the rainy areas of southeastern my country. These landslide disasters are mostly related to rainfall infiltration, and the reduction of soil strength under the action of rainfall is the main cause of landslides. There are many mechanisms for the decrease of soil strength under the action of rainfall. Firstly, with the infiltration of rainfall, the saturation in the slope soil gradually increases, the matrix suction decreases accordingly, and the effective stress decreases, resulting in a decrease in the shear strength of the soil. Secondly, the soil will soften under the action of water immersion, resulting in a decrease in stren...

AI Technical Summary

Problems solved by technology

In fact, for internal unstable soils under seepage erosion, water soaking and subsurface erosion often exist at the same time, and there is an obvious coupling effect between the two, that is, water soaking and subsurface erosion promote each other. lead to a sharp decrease in the strength of the soil

However, there is no corresponding test equipment that considers both flooding and creeping erosion at the same time, and there is still a lack of test methods for the influence of flooding and creeping erosion on soil mechanical properties, which restricts the research on the mechanism of rainfall-induced landslides

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