ANALYSIS OF RAINFALL INFILTRATION STABILITY OF A GRAVEL SOIL LANDSLIDE BASED ON SOIL CONSTITUTIVE MODEL

Rainfall is one of the most active external factors inducing landslides in nature. The reduction of landslide stability by rainfall infiltration is affected by rainfall intensity, rainfall duration, permeability of sliding body, runoff coefficient and lateral recharge, et al. However, there is a lack of lucubrating on the impact of rainfall infiltration on landslide stability in general projects. The researches show thatthe landslide of gravel soil landslide is mainly caused by the displacement of sliding body, the sliding state, the inconsistent play of friction stress on the sliding surface, the continuous development of plastic strain and the inconsistent development, and rainfall infiltration induces landslide mainly by changing the original stress and strain state of rock and soil mass. In landslide prevention and control engineering, shear strength, sliding weight degree, pore water pressure and seepage pressure of sliding zone soil are often taken as important parameters for slope stability analysis and engineering design of prevention and control, while the variation law of stress and strain of landslide rock and soil mass in the process of rainfall is seldom considered. In this paper, based on the constitutive model of gravel soil and the law of soil stress and strain change during rainfall infiltration, numerical simulation method is adopted to analyze the stability of a certain gravel soil landslide by considering factors such as permeability coefficient, runoff coefficient and infiltration intensity, then reveal the distribution of pore pressure and stress in the gravel soil landslide under the influence of rainfall infiltration combined with the observation of the landslide, as to provide theoretical basis for prevention and control ofthe landslide.