基于非饱和渗流机制的含软弱夹层浅层土体滑坡离散元模拟
论文题目
Discrete element simulation of shallow soil landslides with weak interlayer due to the mechanism of unsaturated seepage
1.Department of Underground Engineering, Southeast University, Nanjing 211189, Jiangsu, China
2.National Demonstration Center for Experimental Road and Traffic Engineering Education, Southeast University, Nanjing 211189, China
3.Guangxi Beitou Highway Construction and Investment Group Co., Ltd., Nanning 530028, China
研究内容
Abstract: A hybrid discrete-continuum numerical method was employed to study the shallow red-bed soil landslides that frequently occurred in Southwest China. This study used a clay slope with weak interlayer in Guangxi, China, as a geological model to simulate water infiltration driven by differences in water content in particles. The landslide’s kinematic behavior was performed by the discrete element software MatDEM. Results indicate that the spatial variability of the wetting front is caused by the thickness difference of the soil layer. The water content of the weak interlayer particles increases nonlinearly with time, and the bond between particles decays exponentially with the increase of its water content. In red-bed soil slopes, both higher initial water content and higher recharge boundary water content promote landslide initiation. After triggering the landslide, the soil particles at the foot of the slope and in the weak interlayer move first, and the maximum velocity and kinetic energy of the particles show a trend of first increase and then decrease. During the dynamic process, the sliding body may have an extrusion effect on the underlying soil layer, resulting in a new sliding surface. This study evaluates the effectiveness and potential of this discrete-continuum hybrid numerical approach for revealing the disaster-causing mechanism of rainfall-induced landslides in red-bed areas.
Keywords: Soil landslides; Unsaturated seepage; Discrete element method; Clayey soil; MatDEM
Fig.5 Geometric numerical model of red-bed soil slope
Fig.6 Evolution of water content in the red-bed soil slope simulated by MatDEM
Fig.8 Evolution of velocity in the red-bed soil slope simulated by MatDEM
Fig.10 Profile of the sliding process (t = 11.84 s), the yellow line shows the initial shape of the slope
了解详情
Yu, H., Liu, Z., Tang, Y. et al. Discrete element simulation of shallow soil landslides with weak interlayer due to the mechanism of unsaturated seepage. Bull Eng Geol Environ 84, 129 (2025). https://doi.org/10.1007/s10064-025-04102-8
