- 责任者：Wang Yunsheng (State Key Lab. of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Deng Xi
- 刊名：Hydrogeology and Engineering Geology
- 出版年：2011
- 卷期：38(1)
- 关键词：沉积盖层 ; sedimentary cover ; 土力学 ; soil mechanics ; 金沙江 ; Jinsha River
- 页码：p.40-45, 64
- 图表：4 illus., 13 refs.
- 分类号：1702
- issnNo：ISSN1000-3665
- isbnNo：CN11-2202/P
Overburden of 60～120 m deep is developed in the Qizong segment of Jinsha River. The deep overburden can be divided into three layers upward. Pebble and gravel intercalated with minor fine sand or silty clay with the thickness of 11.1～33 m at the bottom of the riverbed; a layer of fine sand, silty clay, pebble and gravel which with the thickness of 10.04～35 m in the middle of the riverbed; coarse lenses of the drift (blocks), pebble (broken) and gravel layer with the thickness of 9.5~59 m in the upper part. Studies show that the sand lens is not formed by the accumulation of lacustrine, but is formed by accumulation of the relatively still water environment and the normal river floodplain. The engineering effects can be concluded that because of the bad geological conditions it is only suitable for rock-fill dam, the excavated volume is huge, the sand layer treatment depth is large and impermeable treatment is quite difficult.