白鹤滩水电站坝区岩体三维地应力场模拟

岩体地应力是岩体工程最基本也是最重要的工程荷载之一，是设计和分析的基础。应用三维离散单元法（3DEC）对金沙江白鹤滩水电坝区岩体初始地应力场进行了模拟，模拟所得地应力场符合河谷地应力场分布的一般规律，对比水压致裂法6个测点的测值，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。

Three-dimensional stress field simulation around dam area of Baihetan Hydropower Station

Initial stress is one of the key factors for rock engineering, and is one of the elementary indexes required in design, especially for large hydroelectric engineering. The study on in-situ stress field of rock mass around the dam area of Baihetan Hydropower Station had been carried out. Based on the means of numerical simulation with three-dimensional distinct element code (3DEC), the rock mass natural stress of a valley has been simulated. The result shows that the stress distribution has three areas: the area of loosed stress, the area of concentrated stress and the area of stable stress, which is according with typical stress distribution pattern in a deep valley. What is more, the calculations fit well with in-situ measuring data by using hydraulic fracturing method including 6 points. The simulation results delineate clearly the whole outline of the stress field of dam site, and provide important basis for analysis and design.