圆弧夹层破坏机制与被动土压力的非线性极限分析

摘要

Under the condition of nonlinear failure criterion, the earthquake force was regarded as pseudo-static load. In the framework of the upper bound of limit analysis, the passive earth pressures acting on rigid walls were estimated with the combination of circular and planar failure mechanism, where the backfill followed the nonlinear failure criterion. The solutions of passive earth pressures using the combination of circular and planar failure mechanism were compared with numerical solutions using multi-triangular blocks, which aimed to prove the validity of the present method. The results show that the combination of circular and planar failure mechanism is effective to calculate the passive earth pressure, and that the seismic coefficient and nonlinear parameters have significant influences on the pressure. The nonlinear parameters of backfills have influence on the failure shape of rigid walls.%在非线性破坏准则下,将水平地震力作为拟静态力,根据极限分析上限定理,利用圆弧夹层破坏机制求解非线性破坏准则下的被动土压力,并将计算结果与多三角形刚块破坏机制下的数值结果进行比较.研究结果表明:圆弧夹层机制下的被动土压力与多三角形刚块机制下的被动土压力几乎相等;水平地震系数与非线性参数对被动土压力有较大影响；土体非线性参数影响破坏面的形状.