Simulation method and device for dry-wet cycle test of subgrade slope under three-way stress state

Abstract

A simulation method for a dry and wet circulation test of a roadbed slope under a triaxial stress state includes the following steps: (1) mounting and debugging a device; (2) mounting a specimen: mounting the specimen in the device; (3) applying loads: applying a lateral load in the horizontal direction of the specimen to make the specimen transverse stress Fx1 unequal to Fx2 and longitudinal stress Fy1 equal to Fy2, applying a vertical load in the vertical direction, and making the specimen in the triaxial stress state; (4) carrying out a dry and wet circulation test: carrying out moisture absorption and dewetting of the specimen, and recording data of the specimen in the process of moisture absorption and dewetting; and (5) analyzing the data: analyzing the stability, deformation characteristics and water migration characteristics of a soil body in the test process. The simulation device for the dry and wet circulation test of the roadbed slope under the triaxial stress state includes a dry and wet circulation assembly, a dial indicator, a TDR sensor and a pressurization assembly. The simulation method and device are simple to operate and precise in test results, and belong to the technical field of geotechnical engineering test and engineering application.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering test and engineering application, and in particular relates to a simulation method and device for a dry-wet cycle test of a subgrade slope under a three-way stress state. Background technique [0002] The alternating action of rainfall and evaporation in nature causes the dry-wet cycle phenomenon in the embankment slope, which has a huge impact on the physical and mechanical properties and stability of the soil. The current analysis of slope stability is mainly done through numerical simulation and field monitoring. In the process of numerical simulation analysis, the boundary conditions and material properties are often simplified, and the degree of discretization of the structure is different. The results obtained are relatively random, and the most realistic dry-wet cycle characteristics of the roadbed cannot be obtained. The on-site monitoring process is complicated, the oper...

AI Technical Summary

Problems solved by technology

The greater the slope of the subgrade slope, the F x1 , F x2 The greater the difference between them; the process of soil water absorption is likely to cause Fx1, F x2 The difference increases, endangering the stability of the slope

Based on the current research, there is no implementation method that can simulate the dry-wet cycle test under the three-dimensional stress state of the subgrade slope

Images