流固耦合作用下节理岩质边坡失稳过程的RFPA模拟分析

利用基于强度折减法的RFPA-Slope对渗流与应力耦合作用下的软弱互层岩质边坡稳定性进行了数值模拟分析，数值模拟不但直观形象地给出了边坡的渗流场、应力场、破坏区分布，而且得到了边坡滑移破坏面的萌生、扩展、贯通以及坡体整体失稳的渐进破坏过程，同时求得安全系数。并与无地下水的稳定性作了比较，结果表明，地下水渗流的作用使坡体位移增大，边坡安全系数减小，明显加大了滑坡范围。对实例的分析说明，RFPA-Slope能够较为准确地预测边坡潜在破坏面的形状与位置及计算相应的稳定安全系数，本文方法对于边坡，特别是对于复杂边坡的稳定性分析具有实用性。

RFPA simulation and analysis on rock slope subjected to coupled mechanical and seepage flow

The stability analysis on rock slope was conducted by using the RFPA-Slope incorporated with strength reduction theory. Not only were the seepage flow field, stress field and failure zone of slope obtained in the simulation, but also the initiation and growth of the slide surface and macro failure in the slope as well as the safety factor were achieved directly. The numerical results were compared with those outputs obtained in the case without seepage flow, which showed that the displacement of slope increased and safety factor diminished evidently when the seepage flow was considered. And the failure zone expanded due to the influence of seepage flow. The case study indicates that RFPA-Slope can rather rationally predict both safety factor of slope and the corresponding shape and position of the potential slip surface. Accordingly, practical applicability of the proposed technique to complicated cases is verified.