深埋混凝土抗剪结构加固设计方法及其在大型边坡工程治理中的应用

 传统边坡治理技术均采用坡面加固，即使采用抗滑桩、锚索等加固措施的治理深度大多小于80 m，对于存在主控结构面埋深大、强度低的大型潜在滑体的边坡工程，其加固治理尚无成熟方法，一般采用避让和减载等被动方法。以锦屏I级水电站左岸边坡为例，系统阐述在大型边坡工程治理中，深埋混凝土抗剪结构的加固原理及运用条件、洞线设计及洞型选择、开挖方式及施工程序设计、回填混凝土结构及灌浆设计。三维数值分析与现场实践表明，在具有深埋滑裂面的岩石边坡治理工程中，这种结构措施具有置换、补强及抗剪等综合作用，是行之有效的加固治理方法。研究成果可对类似边坡工程问题提供经验和借鉴。

REINFORCEMENT DESIGN METHOD FOR DEEP EMBEDDED CONCRETE SHEAR RESISTANCE STRUCTURE AND ITS APPLICATION TO LARGE SCALE ENGINEERING SLOPE

Traditional slope reinforcement measures adopt slope surface reinforcement such as anti-slidfing piles and cables,in which the depth from the surface to the inside of the slope is less than 80 m.While treatment measures aiming at large-scale potential sliding body with deep weak slip surface are not widely accepted yet,and the passive measures like avoidance and unloading are often employed.Taking the left high slope of Jinping I hydropower station as a case,the reinforcement principle and working conditions of deep embedded concrete shear resistance structures used for treatment of large engineering slope are analyzed;and the design methods of the shear resistance structures,including arrangement of tunnels trend,selection of cross-section types of tunnels,excavation ways and construction procedures,layouts for consolidation grouting holes around the tunnels and segmental and dislocation lamination pouring of backfill concrete,are systematically presented.Three-dimensional numerical results and field practice indicate that the proposed design method for embedded concrete shear resistance structures with the effects of replacement,adding strength and shear resistance for reinforcement of the rock slope with deep slip surface is valid.The proposed design method is not only helpful to ensure the safety of the left high slope,but also provides valuable experiences for the reinforcement of the high slopes of similar projects.