水电站大型地下厂房特殊部位开挖支护技术研究

以我国已建和在建的大型水电站地下厂房洞室施工实践为依据,系统总结了厂房顶拱、高边墙、母线洞等特殊部位的专项施工技术,并总结出了"先中后边、先软后硬","施工分层、一次预裂"及"先洞后墙、通层加固"的技术原则。随后运用三维有限元计算软件,对相关技术的施工效果进行仿真模拟,分析施工工艺对地下洞室施工开挖和围岩破坏的影响,有效地论证了施工技术的可靠性。

Research on excavation and supporting techniques of special parts in large underground powerhouse

Based on the construction practices of the underground powerhouse caverns of large completed and ongoing hydropower stations，a systematic summarization on the construction techniques of special parts like the underground powerhouse roof arch, high side wall and bus cavern are drew out in this paper, including “first middle then both side, first soft then hard”, “layered excavation and one-time pre-split”, “first caverns then side walls and layer-by-layer reinforcement” in excavation and supporting. Three-dimensional finite element software was used to simulate the construction effect of the techniques mentioned above. Through the numerical simulation analysis, the influence of different construction techniques on caverns excavation and surrounding rock failure is evaluated，and the reliability of these construction techniques is verified. 