Rainfall-induced landslide is a common natural hazard, and one of the disaster-causing factors is the loss of apparent cohesion that is mainly caused by the dissipation of matric suction. To analyze the rainfall-induced landslide, especially the post-failure behaviors, a matric suction model is proposed and incorporated into the Discontinuous Deformation Analysis (DDA). In this model, the matric suction is simplified as an equivalent line load and updated at each time step. The safety factor of the simple sliding model simulated by the extended DDA (DDA_c) showed a good agreement with the limit equilibrium method. The simulated relationship between runout distance and the degree of saturation of the multi-block sliding model was validated by the experimental results. Finally, a rainfall-induced landslide in Fukuchi-machi was simulated using the extended DDA. The results illustrated that the apparent cohesion loss is an important mechanism for landslide initiation and a crucial reason for the long-runout distance. The presented DDA_c can be served as a qualified tool to analyze shallow slope stability and post-failure behavior involving apparent cohesion.

降雨引起的滑坡是一种常见的自然灾害，造成灾害的因素之一是表观凝聚力的丧失，这主要是由于基质吸力的消散引起的。为了分析降雨引起的滑坡，特别是失效后的行为，提出了一种矩阵吸力模型，并将其纳入了非连续变形分析（DDA）中。在此模型中，矩阵吸力简化为等效线负载，并在每个时间步长进行更新。扩展DDA（DDA_c）模拟的简单滑动模型的安全系数与极限平衡法显示出良好的一致性。实验结果验证了跳动距离与多块滑动模型饱和度之间的模拟关系。最后，使用扩展的DDA对福知町的降雨诱发的滑坡进行了模拟。结果表明，表观内聚力损失是滑坡引发的重要机制，也是长距离跳动的重要原因。提出的DDA_c可以用作分析浅层边坡稳定性和涉及表观内聚力的破坏后行为的合格工具。