三峡库区许多古滑坡在重力等内、外地质营力作用下呈现出长期而缓慢的变形特征，具有明显的蠕变属性。复活型古滑坡的滑带常处于残余强度状态，其运动特征主要受滑带土力学性质和应力状态控制，研究原状滑带土在残余强度状态下的蠕变特性，对于了解复活型古滑坡滑动机制及预测其运动趋势具有重要意义。针对三峡库区黄土坡滑坡原状滑带土开展环剪试验，研究了不同应力水平条件下滑带土在残余强度状态下的蠕变变形规律。结果表明，滑带土的蠕变速率与剪切应力比RCSR（蠕变剪切应力与残余强度的比值）呈正相关变化，当RCSR接近蠕变阈值1时，滑带土等速蠕变明显，部分试验条件下继而发生加速蠕变，在相同RCSR条件下，土样法向应力越大，其蠕变速率也越大。采用Burger模型对蠕变过程进行模拟，获取了模型的各参数。通过分析滑带土等时蠕变曲线，获得滑带土长期抗剪强度约为0.95倍的残余强度。此外，滑带土蠕变速率受固结时间影响，蠕变速率随固结时间增加而减小，滑带土剪切强度随着固结时间和剪切位移的增加可发生一定程度的恢复。

A large number of ancient landslides in the Three Gorges Reservoir Area present long term and slow deformation characteristics with significant creep properties when undergoing internal and external geological agents. It is commonly thought that the soil on the slip plane of a reactive ancient landslide have already reached the residual state. Mechanical properties and stress state of the soil in the rupture zone dominate the main kinematic feature of a slow-moving landslide. Creep behavior, therefore, has an important value for evaluating reactivation potential and landslide prediction. In this paper, intact soil samples are collected from a reactive ancient landslide. Residual strength of intact sliding zone soil is studied and residual-state creep test is performed afterward. Various RCSR (the ratio of the applied constant creep stress to the residual strength) levels are chosen to study the correlation between RCSR and creep rate. The results show that creep rate of soil is positively dependent on RCSR. As RCSR approaches 1, a pronounced secondary creep occurs in a short time followed by an accelerative creep stage for some tests, namely tertiary creep. At the same RCSR, soil with higher normal stress level has larger creep rate. Burger’s model is employed to simulate the creep behavior and the parameters of Burger’s model are obtained. The long-term shearing resistance is investigated by analyzing the isochronal curves, and the value of long-term shear strength of intact sliding zone soil is found to be approximately 0.95 times as much as that of residual strength. Additionally, consolidation duration can affect the creep rate, which decreases with increasing consolidation duration. This reveals that the mobilized shear strength and residual strength are regained to some extend during consolidation or with shear displacement.