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李家峡全长5km,属青藏高原强烈切割的中高山峡谷区,两岸山势高耸,河道狭窄,河谷呈“V”型,谷坡40°～60°,河面宽40～60m,相对高差200～300m以上。坝址上游90m和750m处,分布有Ⅰ、Ⅱ号两个大型深层岩质滑坡(见图1),其方量分别为698万m~3和1,845万m~3。两滑坡地表近期有新的裂缝产生,一旦滑体失稳,将对电站施工和运行带来危害。因此,查明Ⅰ号,Ⅱ号滑坡地质背景,产生原因,滑动机理,并评价其稳定性,是本电站主要工程地质问题之一。 两滑坡主要勘探试验工作有:钻孔17个,深1620m;平洞25个,深2186米;滑带土物理力学性质试验和矿化分析98组。
Lijiaxia a total length of 5km, is a highly cut in the Qinghai-Tibet Plateau high mountain canyon area, both sides of the mountain towering, narrow river, the valley was “V” type, valley slope 40 ° ~ 60 °, the river width 40 ~ 60m, relative elevation 200 ~ 300m above. Two large deep-rock landslides I and II (Fig. 1) are distributed at 90m and 750m upstream of the dam site, with a squared volume of 6.98 million m 3 and 18.45 million m 3, respectively. Two landslides recently have new cracks, once the sliding body instability, the construction and operation of power plants will be harmful. Therefore, it is one of the major engineering geological problems to identify the geological background of landslide Ⅰ, Ⅱ, its causes, sliding mechanism and evaluate its stability. The main exploration and test work of the two landslides are: drilling 17, depth 1620m; flat hole 25, depth 2186 meters; slippery soil physical and mechanical properties of the test and mineralization analysis of 98 groups.