某水电站进水口高边坡开挖的变形响应研究  

Study of deformation response of a high rock slope excavation at an intake for a large hydropower station

作　　者：朱继良[1,2,3] 黄润秋[1] 张诗媛[2] 徐德敏[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]广西电力工业勘察设计研究院,南宁530023 [3]中国地质调查局水文地质环境地质调查中心,河北保定071051

出　　处：《岩土力学》2010年第2期593-598,共6页Rock and Soil Mechanics

基　　金：广西电力工业勘察设计研究院博士后基金资助

摘　　要：针对西南某大型水电站高达近106m的人工进水口垂直高边坡,通过现场跟踪施工的地质调查工作,系统研究了复杂地质条件和高地应力环境下岩石高边坡大坡比、强开挖所表现的变形响应,揭示了此类边坡变形响应的基本规律及特殊表现。研究表明:高边坡开挖过程中,边坡的变形与开挖过程有较强的同步性。变形主要受开挖卸荷影响,随着开挖的进行,坡体的变形随开挖面的远离表现出总体衰减,最终稳定的响应特征。变形可归纳为3种性质,即浅表松弛型、协调渐变型和回弹错动型,总体以浅表松弛型为主等。Through the abundant geological investigation of construction tracing in situ, the intake slope with vertical height of 106 m at a large hydropower station in Southwest China. the deformation of the high rock slope with great gradient is studied under the conditions of complex geology and high in-situ stress. Through systematical study, the basic laws and special characteristics of its deformation responses are acquired and classified as follows： ①During the slope excavation, it is found that there is strong synchronism between the slope deformation and its excavation process. ②The slope deformation is mainly influenced by excavation. ③The slope deformation generally is weakening with the distance between the excavation plane and the monitoring position, whose responding features of ultimate stability have three stages; that is, rapid increase stage of deformation, slow enhancing stage and the stable stage. ④The high slope deformation can be classified into 3 types, the shallow surface relaxation, the harmonized gradual change and rebound fluctuation. The main one is the shallow surface relaxation.

关 键 词：水电站 进水口 高边坡 开挖 变形响应 

分 类 号：TU457[建筑科学—岩土工程]