大型水电工程中巨型地下洞室群的开挖、支护施工是技术难点,根据现场实际地质条件和工作环境对地下厂房的开挖及支护工法进行改进、对施工机械进行改良,是保证地下洞室群安全、优质、高效、绿色施工的重要保障。本文针对乌东德水电站大型地下洞室群施工过程中关键工法和技术难题,开展创新研发和攻关,包括:大跨度高边墙开挖施工、超大断面调压室开挖施工、小直径溜渣井式竖井开挖、不良地质段超大断面洞室支护、拔管法接触灌浆施工、洞内压力钢管拼装、多孔深竖井混凝土滑模施工、大型出线竖井施工等。从工艺类型、精细开挖、支护和装备革新技术等方面进行关键创新施工方法和技术总结,研究成果可供同类工程建设参考。
The excavation and support construction of giant underground caverns in large-scale hydropower projects is a key route and a concentrated area of technical difficulties in engineering construction. Improving the excavation and support methods and construction machinery of underground power plants based on the actual geological conditions and working environment on site is an important guarantee for ensuring the safety, quality, efficiency, and green construction of underground caverns. This paper carried out innovative research, development and tackling of key construction methods and technical problems in the construction process of large underground caverns of Wudongde Hydropower Station, which included the excavation and construction of large-span high sidewall, excavation and construction of super large section surge chamber, excavation of small diameter slag chute shaft, support of super large section caverns in unfavorable geological sections, pipe pulling contact grouting construction, penstock assembly in the tunnel, concrete slip form construction of porous deep shaft and large outlet shaft construction, etc. Common key innovative construction methods and technologies from aspects such as process type, fine excavation, support, and equipment innovation technology were summarized. The research results could provide the reference for similar engineering construction.
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