三峡库区巴东组泥灰岩顺层缓倾高边坡变形破坏模式研究  

Study on Deformation Mode for Marl Rock of Badong Group with Shelving Dip High Cutting Slopes of Three Gorges

作　　者：欧光照[1,2] 吴益平[2] 肖威[3] 谭伟梅[1] 

机构地区：[1]遵义师范学院,遵义563002 [2]中国地质大学工程学院,武汉430074 [3]西北核技术研究所,西安710024

出　　处：《科学技术与工程》2015年第9期164-169,共6页Science Technology and Engineering

基　　金：国家重点基础研究发展计划(2011CB710606);国家自然科学基金(41272307)资助

摘　　要：三峡库区广泛分布的巴东组泥灰岩工程性质较差,分布在此地层中的泥灰岩高边坡稳定性引人关注。结合泥灰岩的工程地质特性,建立了巴东组泥灰岩顺层缓倾岩体工程地质模型。并以此为基础,根据岩性组合特征与结构面特征,分析了其变形破坏模式主要为滑移或者滑移压致拉裂模式。最后,基于UDEC对巴东白岩沟高边坡进行了变形演化过程数值模拟,结果显示白岩沟高边坡变形破坏经过了2阶段:坡脚开挖使切坡产生了蠕变,而降雨使得边坡稳定性态发生突变,发生滑移破坏,这给此类型高边坡的治理一个启示,做好边坡地表防水、地表与地下排水,对边坡十分重要。Marl rock is widely distributed in the Three Gorges Reservoir area.Because of the poor Engineering geological properties,the stability of mail high cutting slope attracts much attention.Combining with the engineering geological characteristics of marl,the shelving dip layered slope engineering geological model of Badong Group is established.And then,according to the characters of lithology combination and structural plane,the deformation failure modes are mainly to slip or sliding pressure cracking patterns.Finally,numerical simulation was performed for the deformation evolution process of Baiyangou high cutting slopes using discrete element method.The results show that there are 2 phases in the course of Baiyangou＇s deformation and failure： creep stage and mutation phase.Due to excavation slope,the Baiyangou was beginning to be in the stage of creep,and beginning to be in the phase of mutation as a result of rainfall.Because of the rainfall,the mechanicals parameters of fractures declined,which leads to Baiyangou sliding failure.This fact verifies the importance of good drainage on the slope.

关 键 词：三峡库区 巴东组泥灰岩 顺层缓倾岩体 变形破坏模式 数值模拟 UDEC 

分 类 号：P642.22[天文地球—工程地质学]