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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摘要安庆组黏土砾石层广泛分布于皖江上游地区，是由砾卵石和黏土组成的一种特殊工程地质体，工程开挖后极易引起边坡滑塌。以安庆组黏土砾石层为研究对象。首先采用X射线衍射方法分析黏土砾石层的胶结物类型及组分，弄清黏土砾石层的胶结特性包括基质胶结和土石界面胶结。继而开展黏土砾石层边坡室内人工降雨冲蚀模型实验，研究不同砾石含量黏土砾石层边坡破坏失稳模式的变化规律。结果表明：当砾石含量较小(30%)时，边坡破坏以坡面冲沟为主，其破坏形态主要受黏土层控制；当砾石含量增大至50%时，砾石骨架作用逐步体现，边坡破坏形态与土质边坡出现较大差异，边坡破坏表现为侵蚀穴–侵蚀坑–浅层滑塌的演变历程；当砾石含量较大(70%)时，砾石骨架结构相对比较稳定，即使黏土颗粒被大量冲刷，边坡整体稳定性较好。最后分析不同砾石含量边坡基质含水率和湿润峰迁移深度的变化规律，进一步阐释黏土砾石层边坡破坏的内在机制。

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	段海澎1
	余飞2
	黄康2
	戴张俊2
	陈善雄2

关键词 ：土力学, 黏土砾石层, 胶结作用, 含石量, 冲蚀破坏模式, 湿润峰迁移

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

引用本文:

段海澎1，余飞2，黄康2，戴张俊2，陈善雄2. 安庆组黏土砾石层胶结特性及边坡冲蚀破坏模式[J]. 岩石力学与工程学报, 2022, 41(S1): 2801-2811.
DUAN Haipeng1，YU Fei2，HUANG Kang2，DAI Zhangjun2，CHEN Shanxiong2. Cementation characteristics of clay gravel layer and erosion failure mode of slope in Anqing Formation. , 2022, 41(S1): 2801-2811.

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

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