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| Calculation and analysis of the overall stability of the dual element slope of soil and fully weathered rock |
| LI Lianxiang1，2，JIA Bin1，2，ZHAO Yongxin1，2，QIU Hui3 |
| (1. Foundation Pit and Deep Foundation Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；2. School of Civil Engineering，Shandong University，Jinan，Shandong 250061，China；
3. China Railway 14th Bureau Group of the Tunnel Engineering Co.，Ltd.，Jinan，Shandong 250013，China) |
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Abstract There are few studies on the overall failure mode of the soil-rock dual slope in China. In order to explore the overall stability analysis method of the dual-element slope of soil and fully weathered rock in Jinan，based on the overall failure mode of the same team with the same geological conditions of circular arc sliding，the Swedish circular arc method was applied to the soil layer and the fully weathered rock slope. Analyze and obtain the slope stability analysis solution of the horizontal integration model and the vertical integration model，and use the finite element method to verify the specific calculation example. Finally，select typical soil and weathered rock strata in Jinan area，use plaxis 3D finite element software，analyze the slope and the ratio of soil layer to rock layer on the slip surface slope top crack point and safety factor，and propose the value of slip surface slope top crack point Fit formula. The results show that the safety factor obtained by the horizontal integration model is slightly less than the vertical integration model，and the safety factor obtained by the analytical solution is less than the finite element method. The fixed slope height，the thicker the soil layer of the dual element slope of soil and fully weathered rock，the edge The more unstable the slope；The smaller the slope，the greater the safety factor. The research results can be used for reference in similar projects.
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2020, Vol. 39 
