安庆组黏土砾石层胶结特性及边坡冲蚀破坏模式

doi:10.13722/j.cnki.jrme.2021.0675

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Abstract The clay gravel layer of the Anqing Formation is widely distributed in the upper reaches along the Yangtze River in Anhui Province. It is a special engineering geological body composed of gravel and clay. After the excavation of the project，it is very easy to cause slope collapse. In this paper，the clay gravel bed of the Anqing Formation was studied. Firstly，the type and composition of cement in the clay gravel bed were analyzed by X-ray diffraction method，and the cementation characteristics of the clay gravel layer were clarified，including matrix cementation and soil-stone interface cementation. Then，the experiment of artificial rain erosion model in the slope of clay gravel bed was carried out，and the variation law of slope destruction instability pattern of clay gravel layer with different gravel content was studied. The results show that when the gravel content is small (30%)，the slope failure is mainly dominated by gully，and its failure form is mainly controlled by the clay layer. When the gravel content increases to 50%，the gravel skeleton effect is gradually reflected，and the slope failure form is greatly different from the soil slope. The slope failure is manifested as the evolution of erosion hole - erosion pit - shallow layer collapse. When the gravel content is large (70%)，the gravel skeleton structure is relatively stable. Even if the clay particles are washed away in large quantities，the overall stability of the slope is better. Finally，the variation of substrate moisture content and wet peak migration depth of slopes with different gravel content were analyzed，and the internal mechanism of slope failure of clay gravel layer was further explained.

Key words： soil mechanics clay gravel bed cementation gravel content erosion failure mode wetting peak migration

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	Articles by authors
	DUAN Haipeng1
	YU Fei2
	HUANG Kang2
	DAI Zhangjun2
	CHEN Shanxiong2

Cite this article:

DUAN Haipeng1,YU Fei2,HUANG Kang2, et al. Cementation characteristics of clay gravel layer and erosion failure mode of slope in Anqing Formation[J]. , 2022, 41(S1): 2801-2811.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0675 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2801

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