摘要
大渡河长河坝水电站右岸坝肩边坡属于高陡岩质边坡,在开挖过程中先后出现16条贯通性裂缝,对边坡稳定与后续施工安全均存在影响。结合工程地质条件、岩体结构特征与监测成果,确定坡体的主要变形区域和主滑方向,分析坡体变形与裂缝形成的主要成因,以及边坡的潜在失稳模式,提出进一步开挖与支护建议。开挖使J1组结构面临空,导致边坡下部岩体沿J1组结构面产生剪切滑移变形,上部岩体沿J4组结构面产生拉裂,坡顶板裂状岩体倾倒变形;F0断层及其下盘岩体压缩变形,上盘岩体下沉加剧这种变形破裂。边坡变形破坏模式为前缘滑移–中部拉裂–后缘倾倒型破坏。采取强化加固措施后,裂缝变形得到控制,边坡基本达到稳定要求。
The right abutment slope of Changheba hydropower station belongs to high and steep rock slope.During its excavation,sixteen cracks have been found successively;the stability and subsequent excavation of slope have been significantly influenced.Based on the analysis of geological conditions,rock mass structures and monitoring data,major deformation zone and direction of the slope have been defined;the main reasons of the deformation and cracking are deduced;potential instability mode is formulated;and suggestions are made for further excavation and reinforcement.The joint set J1 has been exposed during slope excavation.The shear deformation has happened along the joint set J1,then the upper rock mass has been dragged along joint set J4.The platy rock mass on the slope top tends to overturning.Finally the fault F0 and its footwall rock produce compression deformation,and subsidence of its last plate rock aggregates the deformation of the slope top.The mode of potential instability is toe sliding-middle tension-rear overturning.After implementation of reinforcing measures,the cracking and deformation have been controlled successfully and the slope is basically safe.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第6期1121-1127,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2010CB732005)
国家自然科学基金资助项目(51079093)
关键词
水利工程
长河坝水电站
坝肩边坡
裂缝
变形模式
滑移–拉裂–倾倒
hydraulic engineering
Changheba hydropower station
abutment slope
crack
deformation mode
sliding-tension-overturning
