强降雨条件下岩质边坡倾倒崩塌破坏机理——以鄂西赵家岩崩塌为例  

Toppling failure mechanism of rock slope induced by heavy rainfall:a case study of the Zhaojiayan Rockfall in Western Hubei

作　　者：曾芮 姜明顺 孙琳馗 熊承仁[1] ZENG Rui;JIANG Mingshun;SUN Linkui;XIONG Chengren(Three Gorges Research Center for Geohazards, Ministry of Education, ChinaUniversity of Geosciences, Wuhan, Hubei 430074, Chin)

机构地区：[1]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074

出　　处：《中国地质灾害与防治学报》2018年第3期12-17,共6页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(41272309)

摘　　要：我国鄂西地区山多且陡、岩溶发育、雨量充沛,强降雨作用下崩塌地质灾害频发,研究该区域岩质边坡崩塌倾倒破坏机理对该区域的灾害防治具有重要意义。以该区具有典型代表意义的赵家岩崩塌为研究对象,通过实地勘测,工程地质分析,ABAQUS数值模拟分析等手段,对其变形破坏机理进行研究,结果表明:三面临空近直角陡峭的地形地貌、上硬下软的岩性组合是影响崩塌破坏的内在因素;下伏煤层开挖使得岩体下部架空,改变了岩体内部的应力分布并加速了岩体蠕变破坏的发展;节理裂隙发育改造了岩体内部结构,降低了岩体强度,促进了降雨条件下水压力对岩体的作用;强降水作用使得岩体后缘裂隙快速充水,对岩体产生向外的推力,是岩体崩塌倾倒破坏的直接诱因。In Western Hubei Province,there are many steep mountains,karst phenomena and abundant rainfall which leading to frequent collapse under heavy rainfall. Therefore it is important to study the toppling failure mechanism of rock collapse in this area. The typical Zhaojiayan Collapse as the research object,through field investigation,engineering geological analysis,ABAQUS numerical simulation,the deformation failure mechanism were studied. The results show that： three facing the steep terrain near right angle,upper hard and lower soft rock combination are the intrinsic factors affecting collapse failure; coal seam excavation made the rock mass overhead,changed the stress distribution and accelerated the development of rock mass creep failure; the development of joints and cracks transformed the internal structure of rock mass,reduced the strength,and promoted the effect of water pressure on rock mass under rainfall condition; heavy rainfall made cracks rapid water filling,exerted outward thrust on the rock mass,is a direct cause of toppling failure.

关 键 词：强降雨 崩塌倾倒 破坏机理 ABAQUS 

分 类 号：P642[天文地球—工程地质学]