基于FLAC^(3D)的调压井开挖三维应力应变分析

Three-dimensional Stress-strain Analysis of Surge Chamber Structure by FLAC^(3D)

采用有限差分法大型商用软件FLAC3D对某水电站调压井井筒的开挖过程进行三维非线性模拟,采用三维弹塑性本构模型,构建了调压井的三维计算数值模型,准确模拟边坡坡体结构、初始地应力、施工开挖过程等,并采用FLAC3D中的锚杆单元模拟调压井开挖时的锚固措施,分析锚杆布置的合理性与安全性,根据计算结果分析调压井所处边坡区域的岩体在开挖施工期及运行期典型工况下的应力和变形状况,对调压井的整体、局部稳定性进行了评价分析。

In this study,FLAC3D software was employed to proceed 3-D nonlinearly simulating analysis on surge chamber structure for a hydropower station.The elastic-plasticity constitutive equations were used to establish numerical model of surge chamber structure,and geometrical boundary condition,initial ground stress and excavation works were simulated.In the model,the anchor arms elements were located in the surround rock of surge chamber structure on the excavating process.Stress-strain of structure had been analyzed,The stability of surround rock was evaluated.