锦屏一级水电站地下厂区非线性地应力场反演  

A new method to invert nonlinear stress field of underground powerhouse at Jinping first stage hydropower station

作　　者：任爱武[1,2] 伍法权[1,2] 和海芳[1,2] 王东[1,2] 董金玉[1,2] 叶剑红[1,2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国科学院工程地质力学重点实验室,北京100029

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第5期758-761,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：中国科学院知识创新工程重要方向资助项目(KZCX2-YW-109)

摘　　要：以锦屏一级水电站地下厂区现场工程为依托,提出一种新的地应力场反演方法。该方法考虑了大型结构面对地应力场的影响特征,将含有大型结构面的工程地质模型分区进行处理。首先,在线弹性的状态下,确定边界位移的搜索范围。继而,建立初始应力场拟合优化问题的目标函数,并采用一阶优化算法,有效的避免了繁琐的运算。最后,拟合结果表明精度较好,满足了工程的需要,从而证实了提出的地应力场反演方法的可适用性与正确性。A new method is proposed for inverting the nonlinear stress field around an underground powerhouse at Jinping first stage hydropower station,which contains fault structures.In the proposed method,the geological model is divided into various zones.When applying the proposed method,a range of boundary displacement is obtained using one dimensional linear fitting.To find an optimal boundary displacement,an objective function is formulated and solved.The optimal process is based on first-order optimization method.A case study at Jinping shows that the proposed method can accurately simulate the initial stress field with faults.

关 键 词：岩土工程 锦屏一级水电站地下厂房 初始地应力场反演 大型结构面影响 分区处理 一阶优化算法 

分 类 号：TU413.6[建筑科学—岩土工程]