中文摘要：

以某水电站大型调压井工程为研究背景,从介质类型、初始地应力场、主要结构面、地下水等方面进行概化分析,建立三维数值计算模型进行洞室施工模拟,分析了施工过程中围岩应力和位移的变化和分布规律,将计算位移与实测位移进行对比分析,得出一些有意义的结论。研究表明,工程区的计算本构模型和初始地应力场均对围岩的稳定性造成一定的影响;洞室施工期围岩较稳定;该水电站大型调压井工程选择弹塑性本构模型并施加构造应力场进行施工期数值模拟计算,更加接近真实的工程区围岩特性,可为其它相关工程问题的数值计算提供参考。

英文摘要：

With the large-scale surge tank engineering of a certain hydropower station as the research background, generalized analysis of the media type, the initial stress field, the main structure surface and groundwater was carried out; three dimensional numerical cal- culation model was established to simulate cavern construction; the stress and displacement change distribution of surrounding rock in the construction process were analyzed; some significant conclusions obtained by comparison the calculating displacement with the measured displacement. Studies show that, the calculation constitutive model and the initial stress field can produce certain effect to surrounding rock stability; surrounding rock is relatively stable in the construction process; for the large-scale surge tank engineering of such hydropower station, it is closer to real characteristics of surrounding rock that both the elastic-plastic constitutive model and tectonic stress field are chosen to participate in numerical simulation in the construction process, which has important guiding significance for the numerical calculation of other related engineering problems.