Analysis of deep cutting dualistic structure slope stability considering residual strength of sandstone

Abstract

Abstract: A large number of dualistic structure slopes occurred during the construction of highways in western China, but the strength of the rock mass material in the stability analysis of such slopes is still unclear. Taking the slope engineering of Lanyong high way as background, the cause of the damage of adualistic structure slope composed of loess and sandstone in K35+000~150 of Lanyong high way was analyzed.Choosing a typical section of the slope engineering, FEM was usedto compare the stability and the destruction characteristics of the deep cutting slope under two different situations that the sandstone was respectively at peak strength and residual strength. Moreover, based on residual strength, the effects of prestressed anchors on the slope stability was studied. The results show that the result calculated by residual strength is more suitable forthe actual failure of the dualistic structure slope and that if the slope can be supported by prestressed anchors, the slope stability would be effectively improved to preventthe slope instability.The research results can provide references for the stability analysis of loess-sandstone dualistic-structure high slope in Gansu Province.

Key words: deep cutting slope, sandstone, residual strength, stability

CLC Number:

U417.1+1

YE Shuai-hua, FAN Li-ming, SHI Yi-lei. Analysis of deep cutting dualistic structure slope stability considering residual strength of sandstone[J]. Journal of Lanzhou University of Technology, 2021, 47(5): 106-114.

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