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何为沉井?为什么说向家坝水电站的沉井群是世界规模最大的?回答这些问题,首先得从向家坝水电站坝址的地质条件说起。向家坝水电站工程坝址位于金沙江下游的向家坝峡谷河段出口处。坝址两岸地形整齐,河谷形态呈不对称的“U”型。大坝坝基岩体、地下厂房洞室群围岩体皆以强度很高的厚层砂岩为主。向家坝工程坝址的地形、地质条件适宜修建混凝土重力坝,但也有不尽如人意的地方。其中,坝基范围内河床覆盖层厚达10～40米,是摆在建设者
Why is the caisson? Why say that the caisson group of Xiangjiaba Hydropower Station is the largest in the world? To answer these questions, we start with the geological conditions at the Xiangjiaba Hydropower Station dam site. The dam site of Xiangjiaba Hydropower Station is located at the exit of the Xiangjiaba Canyon reach in the lower reaches of the Jinsha River. The terrain of both sides of the dam is tidy and the shape of the river valley is asymmetrical “U” type. The dam foundation rock mass and the underground powerhouse caverns are mainly composed of thick sandstone with high strength. Xiangjiaba dam site dam topography, geological conditions suitable for the construction of concrete gravity dam, but there are also unsatisfactory places. Among them, the dam foundation within the riverbed cover thickness of 10 to 40 meters, is placed in the builders