Numerical Simulation Study on Mechanical Properties of Coarse-Grain Mixed Soil High and Steep Slope at Different Water Contents

Abstract

In order to study the stability mechanism of coarse-grained mixed soil with high steep slope in different areas of water content in southeast Tibet, this paper takes a high-steep slope of Sejila Mountain in Nyingchi City as the research object, and the undisturbed soil configuration for on-site retrieval includes natural water content. Three kinds of soil samples with a rate of 6%, a water content of 3% and a water content of 9% were obtained by using the ABAQUS numerical analysis using the mechanical parameters obtained by the large-scale triaxial test to obtain the development of the plastic zone of the model. The high-steep slope is used to form the penetrating plastic zone and the calculation non-convergence is used as the safety factor for determining the slope instability. The characteristic point displacement is abruptly changed to the safety factor of the slope instability criterion, and the characteristics of high-steep slope failure are observed. And the sliding surface map and displacement change after numerical calculation to lose stability, analyze the safety factor that forms the through-plastic region as a standard, and the safety factor that does not converge to the force and displacement calculation. The high-steep slope can be known by numerical analysis. The numerical calculation of the natural moisture content gives the highest safety factor, indicating that the high steep slope is the most stable under natural moisture content.