某水电站进水口高边坡开挖的变形响应研究

针对西南某大型水电站高达近106 m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。

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

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.