【摘要】 由于软弱夹层的存在通常会使得边坡更易发生失稳破坏,通过引入考虑强度折减法的有限元极限分析上限法,构建含软弱夹层边坡稳定性分析的非线性规划模型,并采用可行弧内点算法与网格自适应方法进行优化求解,获得不同软弱夹层的厚度、倾角、深度以及软弱夹层与周围土体的相对强度影响下的边坡安全系数及破坏模式。研究结果表明:软弱夹层的厚度、倾角、深度以及相对强度对边坡安全系数及滑裂面位置的影响显著;但当软弱夹层的深度和相对强度增大到一定值时,边坡稳定性不再受其影响。本文结果与已有文献的结果吻合较好。更多还原

【Abstract】 The existence of weak interlayers usually makes the slope more prone to instability.Based on this,by introducing the finite element upper bound limit analysis method considering the strength reduction technique,the nonlinear programming model for the stability analysis of slopes with a weak interlayer was constructed.And a feasible arc interior point algorithm,combined with adaptive mesh method,was adopted for optimization.The upper-bound solutions of safety factors and failure modes of slopes with different weak interlayer thicknesses,angles and depths and strength ratios of the weak interlayer and soil were obtained.The results show that the thickness,angle,depth and relative strength of the weak interlayer have significant influence on the safety factor of slope and the critical sliding surface,but when the depth and relative strength of the weak interlayer are increased to a certain value,the stability of the slope is no longer affected by it.The results in this paper are in good agreement with those in the literature.更多还原