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汶川地震灾区某边坡,因厂房建设需要,对其进行开挖改造。鉴于其稳定性对工厂正常运行有重要影响,本文在岩体质量分级和岩体结构模型概化的基础上,采用快速拉格朗日差分法FLAC3D模拟边坡开挖,分析了边坡在自然条件、暴雨条件以及地震条件下的应力场、位移场、剪应变增量及塑性区的分布和变化特征。研究结果表明:边坡开挖引起坡面局部应力集中,后缘易拉裂破坏;降雨时呈现部分区域安全储备较低;在地震作用下,边坡处于不稳定状态。
Wenchuan earthquake stricken area of a slope, due to plant construction needs, to carry out excavation and transformation. In view of the stability of the plant has a significant impact on the normal operation of the plant, based on the mass classification of rock mass and the generalization of the rock mass structure model, the fast Lagrangian difference method FLAC3D is used to simulate the slope excavation. Conditions, rainstorm conditions and stress field, displacement field, shear strain increment and the distribution and variation characteristics of plastic zone under earthquake conditions. The results show that the local stress concentration on the slopes is caused by the excavation of the slope, and the trailing edge is easily fractured and ruptured. When the rainfall is falling, the safety reserves in some areas are low. Under the earthquake, the slope is in an unstable state.