Spatially non-uniform seismic ground motion, therefore, cannot be taken into account in the seismic safety assessment of the similar underground rock cavern groups.
因此，在进行类似的岩体地下洞室地震动安全评价时可以不考虑地震动空间非一致性的影响。
The stability condition of underground cavern adjacent rock is greatly affected by the adjacent rock stress condition.
地下洞室围岩的稳定状态，在很大程度上受围岩应力状态的影响。
As underground structure, cavern excavation will influence the stability of surrounding rock.
作为地下结构，调压井洞室开挖会对围岩稳定造成影响。
At last, computing tectonic stress of dam zone and the relaxed-tension rock mass influence on the engineering (mostly influence on stability of underground cavern) using three-dimensional FEM.
最后利用三维有限元计算坝址区的构造应力以及这部分卸荷拉裂夹泥岩体对工程(主要是地下洞室稳定性)的影响。
However, evaluation methods of wall rock stability in underground cavern groups with high side-wall, large span and intersect caverns are required for actual projects such as Nuo Zhadu.
但在实际的工程中，特别是对于糯扎渡这种边墙高、跨度大、洞室相互交错的地下洞室群的围岩稳定性问题，还缺少系统的评价方法。
The stability of surrounding rock and the design of reinforcement of underground cavern are the key technique of underground projects.
地下洞室围岩稳定与支护设计是地下工程的关键技术。
Meanwhile, surge shaft is an underground structure because its body is buried by surrounding rock, and the excavation of cavern with big inner diameter will influence stability of surrounding rock.
同时调压井埋于地下，属地下结构，大内径洞室的开挖关系到围岩的稳定。
Surrounding rock mass is in a new humidity condition when underground cavern is excavating, which will change mechanical properties.
地下洞室开挖过程中，围岩处于新的湿度环境中，力学性能会发生改变。
Surrounding rock mass is in a new humidity condition when underground cavern is excavating, which will change mechanical properties.
地下洞室开挖过程中，围岩处于新的湿度环境中，力学性能会发生改变。
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