中文摘要：

利用非饱和土简化固结理论，通过调整土体的排气率和渗透系数来数值模拟干湿循环导致的非饱和膨胀土边坡裂缝的张开闭合以及变形发展过程。结果表明，每次干湿循环后膨胀土边坡均积累了顺坡向的沉降和水平向位移，揭示了干湿循环下膨胀土边坡破坏的浅层性和渐进性。对比离心模型试验结果表明，本文建议的数值模拟方法是可行的。

英文摘要：

The cracking and deformation process of unsaturated expansive soil slope due to dry-wet cycling is numerically simulated by regulating the ratio of drained pore air and coefficient of permeability, based on simplified conslidation theory for unsaturated soil. Simulation result shows that downward settlement and horizontal displacement of the unsaturated soil slope for each cycle will be accumulated and the progressive process and shallow characteristic of slope failure is revealed. This result agrees with the result of geo-centrifuge model test. It verifies that the numerical simulation method proposed in this paper is feasible.