Study on Physical and Mechanical Properties of Soil in a Loess Landslide

Abstract

This article takes a landslide in Zhidan County as the research object. Based on the field survey before and after the landslide occurred, the engineering geological conditions of the landslide were obtained, the landslide deformation characteristics were mastered, and then the landslide development process was divided into the early stable stage, the creeping deformation stage. the severe sliding stage and the stage after violent sliding. Soil samples of the landslide were taken before and after the landslide occurred, and the physical parameters were measured to analyze the physical properties of the slide zone soil. At the same time, direct shear, triaxial, and ring shear tests were used to obtain the mechanical properties of the landslide soil under different test conditions, and the shear strength index value of the slide zone soil was analyzed. The main conclusions are as follows: After the landslide slides fiercely, the water content increases, the plasticity and compressibility increase, the properties of the slip zone soil deteriorate, and the relevant physical parameters such as the porosity ratio of the slip zone soil at the front edge change little; Moreover, the C and ψ values of the landslide soils decreased significantly, indicating that landslide sliding caused a large degree of shear damage to the landslide soils.