金沙江塔城水电站河床深厚覆盖层的形成机制及空间分布特征的研究

Research on Formation Mechanism and Space Distribution Characteristics of Deep Overburden Layer in River Bed of Tacheng Hydropower Station in Jinsha River

塔城水电站坝址区分布有深厚覆盖层,厚度27-106 m,主要形成于第四系晚更新世晚期和全新世,成因复杂,除冲积外尚有近源泥石流洪积、堰塞湖积等多种成因。覆盖层厚度总体呈现近两岸山边薄、中间较厚的特征。各岩性土层在顺水流向空间分布上均连续、完整,而在垂直河流向的分布上变化较大,分布不连续。

The deep overburden layer which was formed in late period of late Pleistocene and Holocene of Quaternary distributes in the dam site of Tacheng hydropower station.The thickness of the layer is from 27 meters to 106 meters,and its formations have many causes such as alluvium,debris flow and barrier lake.The overburden layer is thin in both sides of the hill and thick in middle.The distribution of the rock and soil is continuous along river and discontinuous in the vertical direction.