大型电站坝区应力场三维弹塑性有限元模拟与拟合

STRESS FIELD SIMULATION AND FITTING BY 3-D ELASTOPLASTICITY FEM FOR LARGE HYDROPOWER PROJECT

初始应力场是工程边坡、地下硐室或地基岩体稳定性的影响因素之一,也是工程设计需要的基本指标之一,尤其在大型水电工程建设中显得更为重要。采用三维弹塑性有限元法对金沙江上游一个大型水电工程坝区初始地应力场进行了反演与拟合,厂房区模拟结果达到了一定的精度,能够满足目前阶段的工程需要;对河谷区一半以上水压致裂法测孔的模拟结果令人满意。从总体上看,最小水平主应力模拟结果较最大主应力模拟结果好。

Initial stress is one of the key factors influencing stability of slope, underground cavity and foundation rock mass, and is one of the elementary indexes required in engineering design, especially in large hydroelectric engineering. By using 3-D elastoplasticity FEM, the initial stress field in a large hydropower project on Jinsha River was simulated and fitted. The result shows that the calculations fit well with in-situ measuring data and can satisfy design need. The fitting is better for σ3 than that for σ1.