During rainfall infiltration and fluctuations in the water level, the seepage process of a landslide changes between a saturated and unsaturated state. The resulting landslide deformations do not occur immediately, but experience a time development with typical rheological properties. Slip-surface soil is a special kind of soil formed during the sliding process of a landslide, and its creep properties reflect the landslide dynamics process. The author conducted an unsaturated creep test on the slip-surface soil of a large landslide to study the unsaturated creep properties of slip-surface soil under different stress levels and matric suction conditions. The results showed that the unsaturated creep process of slip-surface soil includes an instantaneous deformation and attenuation deformation stage, which are mainly affected by the matric suction and net confining pressure. The extended Burgers creep equation (M-2 K) for the triaxial test of unsaturated soil was derived based on the test results, and the rationality of the model was verified by comparing its predicted values with experimental data.

在降雨入渗和水位波动期间，滑坡的渗流过程在饱和和非饱和状态之间变化。由此产生的滑坡变形不会立即发生，而是会经历具有典型流变特性的时间发展。滑面土是滑坡滑动过程中形成的一种特殊土体，其蠕变特性反映了滑坡动力学过程。笔者对某大型滑坡的滑面土进行了非饱和蠕变试验，研究了不同应力水平和基质吸力条件下滑面土的非饱和蠕变特性。结果表明，滑面土的非饱和蠕变过程包括瞬时变形和衰减变形阶段，主要受基体吸力和净围压的影响。根据试验结果推导出非饱和土三轴试验的扩展Burgers蠕变方程(M-2 K)，并通过预测值与试验数据的对比验证模型的合理性。