含弱层边坡分区滑动破坏模式及演化规律研究

doi:10.13722/j.cnki.jrme.2020.0933

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Abstract Failure modes and landslide mechanisms of rock slopes with weak layers are of great significance to the study of the stability of open-pit mine slopes. Based on limit equilibrium theory，a regional sliding mechanical model of rock slopes with weak layers is established. The slope above the weak layer is divided into stable region，understable region and unstable region. Mechanical equilibrium equations of the three regions and the stability difference function of the slope are derived. Influence factors of the slope regional stability with a weak layer are studied，and it is revealed that the understable region is the key area of large landslides. The base friction model test of sliding failure process is carried out，and theoretical results are verified. The study shows that regional sliding failure is a typical failure mode of rock slopes with a weak layer，and that the dip angle of the weak layer is the decisive factor affecting the distribution of the stable，understable and unstable regions and that the back end of the understable region of the slope is more sensitive to the dip angle. The slope with a smaller dip angle is more evenly distributed in the three regions，and the slope with a larger dip angle is less stable at the corner. Finally，taking the north landslide in Hejia mining area of Gongchangling open-pit iron mine as the background，the accuracy of the regional sliding failure mode is verified. The research results can provide reference for the research and treatment of similar rock slopes with weak layers.

Key words： slope engineering weak layer regional sliding understable region dip angle base friction test large-scale landslide

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	Articles by authors
	ZHANG Lingfei1
	CHEN Zhonghui1
	TANG Yuesong2

Cite this article:

ZHANG Lingfei1,CHEN Zhonghui1,TANG Yuesong2. Study on regional sliding failure modes and evolution regularity of slopes with weak layers[J]. , 2021, 40(6): 1145-1154.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0933 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I6/1145

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