坝基岩体开挖卸荷松弛特征分析及加固措施——以锦屏一级拱坝为例  

Analysis on Unloading Relaxation Characteristics of Dam Foundation Rock due to Excavation and Reinforcement Measures in Jinping Ⅰ Hydropower Station

作　　者：唐忠敏[1] 张公平[1] 马永军[1] 

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《水电与新能源》2015年第1期5-10,共6页Hydropower and New Energy

摘　　要：结合高地应力环境下锦屏一级坝基岩体开挖卸荷松弛特征,分析了坝基岩体开挖不同锚固措施的加固效果,并根据工程现场坝基岩体开挖锚固措施的试验成果,对高地应力环境下坝基岩体不同开挖加固方案进行了对比分析,提出了锦屏一级坝基岩体的开挖实施方案,有效地降低了开挖卸荷松弛对坝基岩体质量的二次损伤。建议在河床高地应力部位实行先锚后挖的施工程序,保护层开挖滞后时间为2-3个月。The unloading relaxation characteristics of dam foundation rock due to excavation in Jinping I Hydropower Station is analyzed, which is in a high in-situ stress condition.The effects of different anchorage reinforcement schemes for the foundation rock excavation are evaluated.Based on the field experiment results of anchorage reinforcement meas-ures, a comparison analysis is carried out on different excavation and reinforcement schemes for foundation rock mass under high in-situ stress condition.Then, an implementation scheme is proposed for the foundation rock excavation in Jinping I Hydropower Station, which could dramatically reduce the secondary damage of rock quality due to unloading relaxation.It suggests that a construction procedure of “excavation after anchorage” should be applied for high in-situ stress area in the river bed.A period of 2-3 months delay should be adopted for the excavation of protection layer.

关 键 词：高地应力 坝基岩体 卸荷松弛 加固措施 

分 类 号：TV223[水利工程—水工结构工程]