Stability analysis of Nongji Technical School landslide in three gorges reservoir

On the basis of data analysis of indoor research, experiment of on-the-spot great shear and analogy and inverse computation of engineering geology, intensity parameters of landslide mass shear resistance have been measured and acquired. Meanwhile, taking into account the influence of both c and φ rock fragments´ intensity norm against shear restrain, various weights of method values have been allotted and parameters of landslide shear resistance by Nongji Technical School ascertained. The subject of landslide has been anatomized into fourteen units according to six operating conditions, i.e. status quo, sluice 160m and 175, conversion of water level from 175m to 142m, and so on. Therein the stability quotiety reckoned with, the findings are as followed. Firstly, it is 1.60 without rain and 1.13 with downpour, both denoting its stability. Secondly, it is 1.09 when sluice reaching 175m, basically stable. Thirdly, it is 1.02 when sluice arriving at 160m, comparatively instable. Fourthly, it is 0.91 when water level getting to 145m to 175 m, instable. Finally, when meeting with earthquake load, the rate 0.89 means the increasing instability.