十三陵蓄能电站下库河床粘土层渗透特征及其成因模式研究

为解决十三陵抽水蓄能电站下库库尾渗漏问题, 拟在库尾半壁山附近做一防渗墙。由于河床覆盖层内存在着一厚约20m的粘性土层, 如做一悬挂式防渗墙, 把粘性土层做为防渗墙下界, 可比以下部基岩做为下界节约资金约三分之二以上。本文在以往勘探资料的基础上, 通过钻孔、物探、水文地质特征等方面的资料, 分析论证了粘土层在库盆内的连续性, 然后给出了十三陵盆地粘土层的成因及分布模式。

ON THE LEAKAGE CHARACTERISTICS AND FORMATION MODEL OF CLAY LAYER IN RIVER BED OF THE LOWER RESERVOIR OF MING TOMBS PUMPING STORAGE STATION

For solving the leakage problom from the tail of the lower reservoir of Ming Tombs Pumping-Storage Station, a cutoff needs to be constructed. Because there is an about 20 m thick alluvial clay layer in the river bed, the cutoff may be inserted into clay layer instead of bed rock, so that two third of the cost for cutoff will be saved. The paper discusses the continuity of the clay layer in the lower reservoir and a formation and distribution model of the clay layer is suggested according to the drilling result, geophysical and hydrogeological conditions. At last, it is pointed out that clay layer is widespread and continuous and it is feasible that cutoff is inserted into the clay layer.