反倾层状岩质边坡块状–弯曲倾倒变形演化过程试验研究

doi:10.13722/j.cnki.jrme.2023.0870

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Abstract In order to study the toppling deformation and failure mechanism of an anti-dip rock slope in the Three Parallel Rivers area under the combined action of complex internal and external forces. The physical model test of similar materials is carried out，and the evolution process of block-flexure toppling deformation and instability of the anti-dip rock slope under tectonic stress，rapid river downcutting and rainfall conditions is studied. Combined with the discrete element numerical test，the macroscopic deformation characteristics of the slope rock stratum under various working conditions，the displacement variation law of the key points，the evolution of the maximum flexure surface，and the distribution of the plastic zone of the rock stratum are analysed. The results show that：(1) The test results are in good agreement with the simulation results. The evolution process of toppling deformation is divided into four stages：shear flexure of slope toe→maximum flexure surface→flexure and toppling of rock strata under flexure surface→penetration of main fracture surface. (2) The shallow block toppling first occurs in the slope toe area. With the penetration of the maximum flexure surface，the lower strata of the flexure surface show a deep flexure toppling of the laminated network，and the upper strata are relatively stable，which reflects the self-stability characteristics of the anti-dip rock slope. (3) River undercutting is a prerequisite for the formation of flexure toppling deformation of anti-dip rock slope，and rainfall aggravates the transition of toppling body from creep stage to progressive failure stage，which eventually leads to toppling instability of rock strata.

Key words： slope engineering anti-dip rock slope block-flexural toppling external loading evolution process mechanism of destruction

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	Articles by authors
	GONG Yifei1
	2
	YAO Aijun1
	LI Yanlin1
	ZHU Chun2
	LI Hui1

Cite this article:

GONG Yifei1,2,YAO Aijun1, et al. Experimental study on block-flexure toppling deformation evolution process of anti-dip layered rock slopes[J]. , 2024, 43(10): 2497-2510.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0870 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I10/2497

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