裂隙岩体边坡稳定性的渗流与应力耦合分析

用裂隙岩体渗流与应力耦合分析的四自由度全耦合法对岩质边坡进行耦合分析,通过强度折减有限元法求解岩体边坡的稳定安全系数。四自由度全耦合法建立了同时以渗流水压和位移为未知量的耦合方程组,使得渗流场与应力场的求解能够一次性完成,与两场交叉迭代分析方法相比达到了彻底的完全耦合。通过强度折减,整个系统达到不稳定状态,有限元计算将不收敛,此时的折减系数就是安全系数。算例表明由此求得的边坡稳定安全系数和滑动面都与传统方法十分接近。

Seepage-stress coupled analysis of stability of fissured rock mass slope

Four degree-of-freedom completely coupled method is used for coupled analysis of the rock slope,and the safety factor of the rock slope is calculated by use of the strength reduction FEM.With the four degree-of-freedom completely coupled method,coupled equations are developed with the seepage pressure and displacement taken as unknown variables,which make the seepage field and stress field be solved simultaneously and overcome the shortcoming of the conventional method where the two fields are alternately analyzed.Through strength reduction,the whole system reaches an instable state,and the calculated result by the FEM is not convergent.In this way,the safety factor is obtained by c-φ reduction strength algorithm.Case study shows that the safety factor and slip surface of the slope obtained by this method is fairly close to the result of the conventional method.