金沙江某水电站坝基覆盖层的成因及其渗透稳定性

通过对金沙江某水电站河床覆盖层的组成及分布特征的研究,探讨其坝基覆盖层的成因机制.采用多种理论公式判别覆盖层的渗透变形形式、计算抗渗强度参数,进一步综合评价该覆盖层的渗透稳定性.结果表明河床覆盖层是在地质构造运动和气候变化共同作用下形成的,其主体应该是末次冰期间冰段河谷的产物;覆盖层具备发生管涌与流土的条件,其允许水力...

Study on the characters and seepage stability of the cover on the dam foundation at a hydropower station along Jinsha River, China

Based on the study of the composition and distribution of the deep-sick cover on the river bed at a hydropower station in Jinsha River of China,this paper discusses the genetic mechanism of the cover on the dam foundation.Using a variety of theoretical formulas,the paper identifies the seepage deformation form,calculates anti-permeability strength parameters,and further comprehensively evaluate the permeability and stability of the cover.The results show that the cover on riverbed is formed by the action of the tectonic movements and the climate change,and be dominated by the climate factor.The cover has piping and flowing soil conditions,the permissible hydraulic gradient value is relatively high,and the necessary seepage prevention is needed.The conclusion provides a theoretical basis for the construction of a hydropower station.