边坡一般是指由于自然因素或人为因素形成的斜坡，其变形与失稳破坏有时会造成重大的灾害。沉陷式边坡是指其在变形或破坏过程中，以竖向位移为主的边坡。本文利用PLAXIS有限元程序对此沉陷式边坡的两个变形阶段进行数值模拟，将模拟结果与实际变形对比，分析了此边坡变形的主要原因为：引水隧道开挖时坍塌形成的空洞区未处理，使空洞区上部岩土体下沉，加之人为因素对边坡的影响；致使地表裂缝的形成并逐步增大；地表水通过裂缝、节理裂隙下渗到引水隧道过程中将土体颗粒带走，致使土体抗剪强度降低、弹性模量减小，从而致使沉陷式边坡的形成。%Generally, the slope is formed by natural factors and human factors.It can cause significant disaster through the deformation、instability and failure. The settlement type slope which the vertical displacement is given priority in the process of deformation or destruction.This paper uses the PLAXIS finite element program to simulat two stages of this slope deformated. Combinated with the engineering geological conditions, the simulation results and actual deformation slope were compared. Meanwhile it analyzed this slope deformated reason were that the excavation of diversion tunnel collapse when the formation of the hollow area untreated and the influence of human factors.It causes the hollow area the upper rock mass surface crack formed and gradually increased.Then surface water through the cracks, joints and fissures infiltration into the soil in the process of water diversion tunnel particles. It caused the soil shear strength and the elastic modulus reduced tant lead the settlement slope.
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