摘要
坝基扬压力是评价混凝土重力坝安全运行性态的重要依据。以松树岭水电站大坝为工程实例,采用测压孔灵敏度现场测试分析、扬压水位变化过程定性分析、上游水压分量统计模型定量分析等方法,对2、3号坝段坝基渗压系数超过设计控制值的现象进行综合分析,其原因可能是坝基防渗帷幕的防渗效果没有达到设计要求。2017年对2、3号坝段坝基防渗帷幕进行了补强灌浆,相应测压孔实测扬压水位和渗压系数均有较大幅度的下降,补强灌浆效果较好。
The uplift pressure acted on the dam foundation is an important factor to evaluate the operation safety of concrete gravity dams.Based on the in-situ sensitivity testing of pressure holes,qualitative analysis of the uplift pressure variations,and quantitative statistical analysis of the upstream hydraulic pressure components,the excessive seepage pressures observed in the 2#and 3#dam section foundations in Songshuling Hydropower Station are analyzed comprehensively.The results suggest that the excessive uplift pressures are probably due to the effect of the seepage proof curtain and drainage holes failing to meet the expected design requirements.Then,reinforcement grouting of the seepage proof curtain is carried out in the 2#and 3#section foundation in 2017.After the treatment,the measured uplift water levels and the seepage pressures are greatly reduced,which demonstrates the effect of the reinforcement grouting.
作者
牟猷
张成
陈刚
吴勇
MOU You;ZHANG Cheng;CHEN Gang;WU Yong(School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China;China Guodian Zhuxi Hydropower Development Co.,Ltd.,Shiyan 442000,China)
出处
《水电与新能源》
2019年第9期28-32,共5页
Hydropower and New Energy
基金
国家自然科学基金项目(51379162)
广东省水利科技创新项目(2016-06)
关键词
大坝
安全监测
坝基扬压力
超标现象
补强灌浆
dam
safety monitoring
uplift pressure on dam foundation
excessive
reinforcement grouting
