二折线数值模型在岩质边坡稳定性分析中的应用

Application of dual-polyline numerical simulation model in slope stability analysis

影响边坡稳定性的因素错综复杂,正确认识影响边坡稳定性的不利因素,一直是边坡稳定性分析的重点。基于边坡临界破坏状态判别方法及强度折减法和排中律思想,自编快速搜索边坡安全系数的计算程序,建立二折线边坡数值模型,分析了边坡几何形态及结构面物理力学参数对边坡稳定性的敏感性,并应用于某边坡稳定性分析中。研究结果表明:岩体内结构面的内摩擦角、凝聚力、边坡高度、坡角均对二折线边坡稳定性有着不同程度的影响,且即使同一边坡工程,在不同的施工阶段,影响因素也会不同。

The factors that influence the slope stability are various and complicated, and correct recognization of adverse fac- tors is always a concerned link in the stability analysis. Based on discrimination method on critical failure status of slope, and ac- cording to the theory of strength reduction and law of excluded middle, we establish a dual - polyline numerical model by develo- ping a quick search algorithm of slope safety coefficient. By the model, the sensitivity of slope geometry shape and mechanical parameter of structural plane on slope stability is analyzed. The results show that the friction angle of structural plane, cohesion force, slope height and slope angle all have different influences on safety coefficient of the dual - polyline slope, and even for the same slope under different construction stages, the dominated influencing factors are different.