对于坝址岩性软弱的重力坝，其基岩的蠕变特性导致地基应力随时间不断调整，目前采用的弹塑性计算无法得到坝体的长期深层抗滑稳定性。本文通过典型算例，分别采用基于Cvisc模型的考虑蠕变的强度折减法以及常规的弹塑性强度折减法进行深层抗滑稳定计算，并对结果进行比较。结果表明，考虑基岩的蠕变特性时，重力坝的深层抗滑稳定安全系数偏小，而坝体失稳时的特征点位移值偏大。当重力坝的基岩较软，蠕变特性较明显时，必须充分考虑基岩的蠕变特性对坝体深层抗滑稳定性的影响。

For gravity dams with weak foundation, the creep behavior of the bedrock causes the stress of the foundation to adjust with time. The present elastic-plastic calculation can not obtain the long-term deep sliding stability of the dam. In this paper, the creep-considered strength reduction method based on Cvisc model and the conventional elastic-plastic strength reduction method were used to calculate the deep anti-sliding stability through typical examples, and the results were compared. The results show that the safety factor of deep anti-sliding stability of gravity dam is smaller and the displacement of characteristic points is larger when the creep characteristics of bedrock are considered. When the foundation rock of gravity dam is weak and the creep characteristics are obvious, the influence of the creep characteristics of the foundation rock on the deep sliding stability of the dam must be fully considered.