中文摘要：

为了研究不同空间关系下洞室开挖过程中围岩应力场变化规律,依据洞室群不同的相对截面,相对水平距离,相对深度,利用3D-Sigma软件设计了三组洞室群模型,每组模型包含3个模型,模拟了洞室开挖过程中围岩应力场变化状况。通过在拱顶、拱底、左右拱脚等区域设立应力监测点,详细分析了洞室开挖过程中围岩应力场空间上和时间上的变化规律———不同截面位置应力变化差异和开挖突变后随时间逐渐趋于稳定,并对洞室群围岩应力场出现的恶化效应和优化效应现象进行讨论。最后将模拟结果和实际水电工程的安全监测数据对比,验证模拟成果的有效性。

英文摘要：

In order to study variation law of rock stress field under different spatial relationships of caverns during excavation period,considering the different relative section areas,relative horizontal distances and relative depths of caverns,we used numerical simulation software of 3D-Sigma to establish three groups of caverns models,each contains three models respectively.Through setting up stress monitoring points at top arch,bottom arch,left and right arches,we analyzed the stress field change in the range of space and time during the excavation process,namely the differences of stress variation in different positions of section area and its stabilizing process with time;we discussed the features of stress deterioration and optimization in the actual excavation process.Finally,the simulation results were compared with the actual hydropower engineering safety monitoring data in order to verify the validity of simulation results.