郴州某二叠系煤系土滑坡变形机理分析  

Analysis on deformation mechanism of a coal-bearing soils landslide in Chenzhou

作　　者：左文贵[1,2] 张家林[1,2] 贺勇 ZUO Wengui;ZHANG Jialin;HE Yong(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education,School of Geoscience and Infophysics,Central South University,Changsha,410083,China;School of Geoscience and Infophysics,Central South University,Changsha,410083,China)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083

出　　处：《浙江工业大学学报》2018年第6期672-676,共5页Journal of Zhejiang University of Technology

摘　　要：煤系土是一类广泛分布于岭南丘陵地区的炭质岩强风化的产物,煤系土滑坡在诱发机理及变形方面的特点十分突出。以郴州某二叠系煤系土滑坡为例,通过成因分析结合煤系土物理力学性质方面的研究成果,定性阐述了煤系土滑坡的诱发因素和变形机理。有限元模拟结果及监测数据定量反映了煤系土滑坡主要受水的作用及坡体形态改变的影响,水的溶蚀及渗流作用破坏了煤系土结构从而在坡体内产生塑性应变带。坡形改变引起的应力重分布使坡体产生集中于堆载区的变形,最大达到1.7m,变形值大于滑坡上部和坡脚处变形值。上述两者共同作用导致滑坡形成埋深相差约5m的两条滑带并在滑坡上部连通。案例可为该类型滑坡防治提供理论参考。Coal-bearing soils are a kind of strong weathering carbonaceous rocks that are widely distributed in Lingnan Hilly Area.The characteristics of landslides developed in coal-bearing soils are very prominent in the mechanism and deformation of landslides.By takeing the Permian coal-bearing landslide in Chenzhou as an example,the physical and mechanical properties of coal-bearing soil is combined with the genesis analysis to qualitatively expound the inducing factors and deformation mechanism of the coal landslide.The finite element simulations and monitoring data quantitatively show that the coal landslide is mainly affected by the action of water and the change of slope body shape.Water erosion and seepage make the structure of coal-bearing soils break down and produce plastic strain bands in landslide,resulting in changes in morphology.Stress re-distribution causes the slope body to concentrate on the deformation of the surcharge region,reaching a maximum of 1.7 m.The deformation value is greater than those at the upper part of the landslide and at the foot of the slope.The combination between them causes the landslide to form two sliding belts with a burial depth of about 5 m and connects near the upper part of the landslide.This case can provide a theoretical reference for this type of landslide prevention.

关 键 词：煤系土 变形机理 诱发因素 有限元 

分 类 号：TU42[建筑科学—岩土工程]