灾害学2018，Vol.33Issue(2)：212-217,6.DOI:10.3969/j.issn.1000-811X.2018.02.037
三峡库区软硬互层岩质滑坡变形机制分析——以云阳向城小学滑坡为例
Analysis of Deformation Mechanism of Slope with Soft and Hard Rock Interbedded Structure in Three Gorges Reservoir Area: A Case Study of Xiangcheng Elementary School in Yunyang
摘要
Abstract
Continuous deformation have occurred on Xiangcheng elementary school landslide since 2011,whose stability development trend is closely related to the safety of the lives and properties of the residents on the slope.Based on detailed landslide investigation and engineering exploration,the special geologic environment and characteristics of the landslide are examined.And we analyzed the mineral composition and microstructure of mudstone weak intercalations by XRD and SEM,and also test the disintegration and expansibility of silty mudstone in the laboratory.The deformation and failure mechanism was studied from many aspects including rock mass formation,geological structure,and external dynamic function.Research shows that Xiangcheng elementary school landslide is a bedding rockslide developing in soft-hard alternant strata.The stability of the landslide is mainly controlled by weak interlayer which is evolved from mudstone.The formation and failure model of the slope is creeprip-cut off.The main clay minerals of weak interlayer are illite and illite-montmorillonite mixed layer mineral with good hydrophilicity and instability,and the disintegration of the clay minerals performs good.The microstructure of the main clay minerals is given priority to lamellar structure,part of them present layered orientation arrangement.The formation and evolution of the landslide are controlled by combined effects including rock mass formation features,geological structure influences,the coupling effects of rainfall and water level variation play an important role on promoting the deformation of the landslide.These results can contribute to deeply understand the deformation and failure mechanism of similar landslides,and guide the disaster prevention and mitigation engineering.关键词
岩质滑坡/软硬互层/变形失稳机制/三峡库区/向城小学滑坡Key words
Rockslide/soft-hard alternant strata/deformation and failure mechanism/Three Gorges Reservoir area/Xiangcheng elementary school landslide分类
资源环境引用本文复制引用
吴瑞安,魏云杰,冀承蕾..三峡库区软硬互层岩质滑坡变形机制分析——以云阳向城小学滑坡为例[J].灾害学,2018,33(2):212-217,6.基金项目
中国地质调查基金项目(DD20179609) （DD20179609）
