天生桥二级电站厂房区地应力场的三维有限元反演分析

Back-Analysis of In-Situ Stress Field in the Area of Powerhouse of Tianshengqiao-Ⅱ Hydroelectric Power Station by Three-Dimensional FEM

本文针对贵州天生桥二级(坝索)电站厂房区的地质条件较为复杂,具有较多软弱夹层这一特点。根据地应力实测结果及地形、构造形迹资料,采用地应力场的边界荷载调整法和三维弹塑性有限元,对厂区的地应力场进行了反演,得到的地应力场反映了地形条件、地质构造等对地应力场的影响,为工程提供了较为合理的、可用的三维初始应力场。

Based on the measured data and the information of topography and tectonic trace, the in-situ stress field in that area of powerhouse of Tianshengqiao- Ⅱ hydroelectric power station is obtained by using the back-analysis and three dimensional olastoplastic FEM. The in-situ stress field obtained reflects the effect of topography and geologic structure on it.The method should provide ayreasonable and available three dimensional in-situ stress field for engineering design of structures.