摘要
40多年来,大量的水利水电工程勘测资料和第四纪冰川第四纪地质研究成果表明,我国东部河谷可划分为冰川型和河流型两类,其工程地质特征显然不同。冰川型河谷石盆石坝相间存在,利于水库坝址的修建,冰碛物的工程特性良好,是一般重型建筑物的天然地基。坝址施工时不应一概挖掉。埋藏谷与谷底深槽的存在常是库坝渗漏的通道,它有一定的分布规律,在勘察工作中要认真注意查找。冰水沉积物工程特性较差,有的易产生振动液化。
The formation of river Valley Can be divied into two typeo: the glacial and the stream valley. A basic feature of this glacial valley is ao follows the alterna- tion between the rock bar and basin on the longitudinal saction of the river and the development of the deep trough. The glacial deposit is a high strength sail with a little percolation rafe which is distribution in the river bed.
