那伦水库料场边坡岩土体开挖变形及破坏特征  

Relationship Between Rock-soil Body Structure and Excavation Deformation Failure in Quarry of Nalun Reservoir

作　　者：王汉臣 邓华锋[2,3] 刘健 徐绪程 王孔伟[2,3] WANG Han-chen;DENG Hua-feng;LIU Jian;XU Xu-cheng;WANG Kong-wei(CCCC Second Harbor Consulants Co.,Ltd.,Wuhan 430060,China;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University,Yichang 443002,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]中交第二航务工程勘察设计院有限公司,湖北武汉430060 [2]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [3]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《水电能源科学》2024年第12期82-86,共5页Water Resources and Power

基　　金：长江三峡通航管理局项目(基211201);国家自然科学基金重点项目(U22A20600)。

摘　　要：针对那伦水库修建过程中料场边坡发生滑坡对大坝和库岸安全构成了潜在危害的问题,在野外地质调查研究及勘察资料、监测资料分析评价的基础上,研究了料场边坡的岩土体结构及变形破坏机理。结果表明,料场边坡位于板内复向斜南翼构造内部的那伦向斜处,那伦向斜构造控制着边坡的整体演化规律;料场边坡岩体内部存在大量层间剪切带,在后期卸荷风化作用下,层间剪切带局部泥化,形成后期变形破坏的滑动面,岩体结构整体表现为全—强风化基岩与泥化夹层共同构成层状碎裂结构岩体;料场后边坡变形破坏机理主要是由于陡缓倾角转变带的缓倾角部分在边坡开挖过程中阻滑力消失所造成;料场西边坡变形破坏机理主要是由于处于向斜构造仰起端部位,两翼岩层陡倾翼在重力作用下向陡倾临空面滑移形成。During the construction of the Nalun Reservoir,a landslide occurred in quarry,which caused potential harm to the safety of the dam and the reservoir bank.Based on field geological investigation analysis,evaluation of survey data and monitoring data,the rock and soil structure and deformation failure mechanism of quarry of Nalun Reservoir were studied.The results show that the quarry slope is located at the Nalun syncline inside the south wing structure of the intraplate complex syncline,and the Nalun syncline structure controls the overall evolution of the slope.There are a large number of interlaminar shear zones in the slope rock mass of quarry of Nalun Reservoir.Under the action of late un-loading weathering,the interlaminar shear zones are partially muddy,forming a sliding surface of deformation and failure in the later stage,and the whole rock mass structure is composed of fully-strongly weathered bedrock and muddy interlay-er.The deformation and failure mechanism of the slope behind quarry of Nalun Reservoir is mainly caused by the disap-pearance of the anti-sliding force of the slow dip transition zone of the steep dip transition zone in the process of slope ex-cavation.The deformation failure mechanism of the west slope of quarry of Nalun Reservoir is mainly due to its position at the uplift end of the syncline structure,and the steep dip wings of the two wings slip to the steep empty surface under the action of gravity.

关 键 词：那伦水库 边坡变形破坏 岩土体结构 层间剪切带 开挖卸荷 

分 类 号：TV223[水利工程—水工结构工程]