基于Plaxis强度折减法的开挖边坡稳定分析

利用Plaxis有限元软件,针对某开挖高边坡地质地形特征,采用有限元强度折减法对边坡无支护的情况和采用预应力锚索加固两种方案进行了模拟,模拟结果表明,无支护边坡其安全系数小于1,稳定性较差,无法满足规范要求;采用预应力锚索加固后,安全系数增加,且边坡潜在滑裂面从浅层风化岩体向下部岩体移动,边坡稳定性增加。同时,对计算结构的精度做了对比,与极限平衡Bishop法结构相比其误差在2%以内,且潜在的危险滑裂面形状和位置基本一致,论证了其准确性和工程实用性。

On stable analysis of slope excavation of strength reduction method based on Plaxis

The paper adopts the Plaxis finite element software, simulates the two consolidation methods for the slopes without support by applying the finite element strength reduction method and the adoption of the prestressed anchor cable consolidation, and proves by the simulation result that the safe coefficient of the slopes without support is less than 1 with worse stability, so it can not meet the requirement of the regulation ; its safe coefficient is strengthened ＇after the prestressed anchor cable consolidation is adopted and the slope stability increases when the potential slipping surface of the slope move towards to lower layers from the superficial weathering rock, and compares the accuracy of the calculated structures, and its error is within 2 percent, compared with structure of the limit equilibrium Bishop method, illustrates the potential hazardous slip surface is consistent with shape and the locations, and proves its correctness and the engineering application value.