某水电站地下厂房区域初始地应力场研究

Study on Initial Geostress in An Underground Powerhouse Area at One Hydropower Station

岩体初始地应力场是影响岩体变形与稳定的主要力源,也是岩土工程设计和施工中考虑的主要因素之一,尤其是在大型地下工程建设中显得尤为重要。根据某水电站厂区的地质条件及地应力实测资料,运用有限元数值分析方法,对坝址区初始应力场进行了回归反演分析,通过多方案筛选,取得了较为客观合理的初始地应力场,为地下厂房的设计和施工提供了可靠依据,其方法可供类似工程参考。

Initial geostress field in rock mass is the main force affecting rock deformation and stability.And it is also one of main factors considered in geotechnical design and construction,especially in large-sized underground projects.Based on geological conditions and measured geostress in a powerhouse area of one hydropower station,regression back analysis on initial geostress field in the damsite area is performed by finite element numerical method.A proper initial geostress field is obtained from many alternatives.This result provides reliable basis for design and construction of underground powerhouse and gives references to oth- er similar projects.