【摘要】 运用基于非线性规划的有限元塑性极限分析下限法,对某土坝坝体的稳定性进行了分析。将坝体用三结点线性三角形单元离散,并将孔隙水压力看作一种外力荷载作用于各结点上,以结点有效应力为未知量,根据平衡约束条件、屈服约束条件、应力间断面约束条件、应力边界约束条件,求得坡体强度储备系数的下限值及相应的静力容许应力场。将刚体极限平衡法计算结果与塑性极限下限法计算结果进行比较分析,论证坝体的稳定性。更多还原

【Abstract】 The lower bound method of finite element plastic limit analysis based on nonlinear programming method was applied to analyze earth dam’s stability.Three-node linear triangular finite elements were used to construct statically admissible stress fields of dam,and the pore water pressure was as an external load on each node.According to conditions of equilibrium,yield,stress discontinuity and stress boundary,the lower bound of strength safety factor of dam and the corresponding static allowable stress field was obtained.Comparing to the result of rigid body limit equilibrium method,the stability of dam is proved.更多还原