Stability Analysis of a Large Soil-rock Mixture in the Upper Reaches of Lancang River

Abstract

Exampled by a large soil-rock mixture located in a hydropower station reservoir area of lancang river in Tibet as the research object, first the in-situ direct shear test in situ measurement to obtain representative soil samples under natural state and saturated state of the mechanical parameters, then through calculation of the SLIDE software for the soil-rock mixture in natural river level and normal pool level limit equilibrium stability calculation under two kinds of working condition. The results show that at the natural river level, the stability coefficient of the soil-rock mixture base interface is 2.893~4.625, which is the overall stability state, the stability coefficient of the local dangerous sliding arc of the leading edge is 0.960~1.370, and there is a small scale bank collapse at the leading edge. Under normal pool level limit, the stability coefficient of the basal interface is 2.261~3.534, but it is still in the stable state. The stability coefficient of the local dangerous slide arc of the leading edge is 0.738~0.857, and the bank collapse phenomenon in the leading edge is intensified.