Rock-soil body dry-wet cycle test system and method in unsaturated state

Abstract

The invention discloses a rock-soil body dry-wet cycle test system in an unsaturated state. The rock-soil body dry-wet cycle test system comprises a sample drying chamber and a sample humidifying chamber, the sample humidifying chamber is communicated with an external aqueous solution, the sample drying chamber can dry a rock-soil body sample, the sample humidifying chamber and the sample drying chamber can restore the chemical environment and the confining pressure of the rock-soil body sample during humidifying and the air pressure, the humidity and the like of the rock-soil body sample during drying as much as possible, and restore the real environment of the sample; the lifting top seat and the lifting base are matched to drive the rock-soil body sample to do reciprocating motion, the sample can achieve dry-wet circulation in an unsaturated state, sensor pieces are arranged on the lifting top seat and the lifting base, and parameter changes of the rock-soil body sample in the testing process can be monitored in real time. The invention further provides a rock-soil body dry-wet cycle test method in the unsaturated state, and the operation convenience of the rock-soil body dry-wet cycle test in the unsaturated state is further improved.

Description

technical field [0001] The invention relates to the technical fields of geological engineering and environmental geotechnical engineering, in particular to a dry-wet cycle test system and method for rock and soil in an unsaturated state. Background technique [0002] The dry-wet cycle is an inevitable working condition of rock and soil in the natural environment, which often leads to changes in the properties of rock and soil and then affects engineering construction. For example, in projects involving landfill cover systems, nuclear waste repository engineering barriers, roadbed fillings, and expansive soil slopes, rock and soil are significantly affected by the dry-wet cycle. The long-term wet-dry alternating state leads to changes in the particle arrangement, pore structure, and microscopic characteristics of the soil, which in turn affects the macroscopic performance indicators of the rock and soil, such as compressive strength, shear strength, and gas-liquid permeabilit...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a dry-wet cycle test system and method for rock and soil in an unsaturated state, so as to solve the problems in the above-mentioned prior art and solve the difficult problem of dry-wet cycle test for rock and soil in an unsaturated state. And improve the operation convenience of the dry-wet cycle process and the accuracy of rock-soil related parameters acquisition during the test process

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