土石坝灌浆设计与施工关键技术探讨OA北大核心CSTPCD

The grouting process for the foundation of earth-rock dams,including core wall rockfill dams and panel rockfill dams,is influenced by various factors such as limited cover depth,blasting operations,unloading proces-ses,and the presence of weak rock formations.These factors often lead to challenges such as significant uplift,frac-turing,and seepage during grouting operations,posing difficulties in achieving effective injection and ensuring quality,consequently jeopardizing the reservoir's normal water storage.We analyzed the key design issues such as the selection of foundation rock mass,layout of grouting corridors,arrangement of grouting holes,determination of grouting and inspection pressures.Furthermore,on the basis of specifications and engineering practice,we dis-cussed the grouting methodologies,methods for managing external seepage,selection of blocking devices,control of uplift,and pressure augmentation strategies.Finally,we propose the method of determining curtain grouting pres-sure and inspection pressure,the systematic sealing and ramdom sealing for leakage,the criteria for selecting bloc-king devices,and the grouting control based on P-Q relation to offer reference for similar dam foundation grouting.