Based on the relationship between loess moisture content and shear strength obtained from ex-periments,and drawing on the idea of the finite element strength reduction method,the safety factor of the tunnel at different times under the action of rainfall was obtained through numerical simulation.By continu-ously setting the shear strength parameters of the soil at different times(different water contents),the plastic zone of the surrounding rock of the loess tunnel continues to expand until a sudden change in plastic strain or displacement occurs,indicating that shear failure of the tunnel occurs,and rainfall occurs at this time.Critical time for shear failure under action.
维普
万方数据