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一、概述卡基娃水电站位于四川省凉山州木里县境内的木里河上游,坝址距小金河口198.5km,距木里县城约200km,工程区所有隧洞的地层岩性主要为奥陶系下统人公组(O1r)的变质石英砂岩、千枚化板岩及砂质板岩。由于工程区的隧洞均未穿越区域性断裂,隧洞围岩条件和围岩的稳定性主要受控于地层岩性、岩石强度、岩体完整性、结构面组合、风化卸荷程度、上覆基岩厚度、水文地质,以及结构面与隧洞轴线交角等条件。
I. Overview The Kajiwa Hydropower Station is located in the upstream of Muli River in Muli County, Liangshan Prefecture, Sichuan Province. The dam site is 198.5km away from Xiaojinhekou and about 200km from Muli County. The stratigraphic lithology of all the tunnels in the project area is mainly Ordovician Metamorphic quartz sandstone of the Lower Ordos Formation (O1r), a thousand of slate and sandy slate. Since none of the tunnels in the project area cross regional faults, the surrounding rock conditions and the stability of the surrounding rock of the tunnel are mainly controlled by lithology, rock strength, rock mass integrity, combination of structural planes, degree of weathering and unloading, Rock thickness, hydrogeology, and the intersection of the structural plane and the tunnel axis.