复杂地质条件下高重力坝坝基运行性态分析  

Analysis on operation behavior of high gravity dam foundation under complex geological conditions

作　　者：齐智勇[1] 陈舰 李秋炎[1] 黄涛 许雷 QI Zhiyong;CHEN Jian;LI Qiuyan;HUANG Tao;XU Lei(China Yangtze Power Co.,Ltd.)

机构地区：[1]中国长江电力股份有限公司,湖北宜昌443000 [2]国家能源局大坝安全监察中心,浙江杭州311122

出　　处：《大坝与安全》2023年第4期33-38,共6页Dam & Safety

摘　　要：某高重力坝坝基存在挤压带、软弱夹层及挠曲核部破碎带等诸多不利地质构造,建设期采用了置换混凝土、加强灌浆、增设防渗墙等针对性处理措施。运行期变形和渗流监测结果分析表明,坝基变形稳定,不存在明显的不均匀变形和深层滑动,坝基扬压水位局部偏高,但坝基抗滑稳定安全性仍满足要求,坝基岩体渗透稳定,大坝渗流量逐年减少且出水清澈,坝基运行性态正常,可为类似复杂地质条件下坝基处理和防渗设计提供借鉴。Many unfavorable geological structures existed in the foundation of a high gravity dam,such as compression zones,weak interlayers,and fracture zones in the flexural core.Targeted treatment methods such as replacing concrete,strengthening grouting,adding cut-off walls,and optimizing the seepage prevention system of the dam foundation were adopted during construction.By analysis of deformation and seepage monitoring data during operation,it was found that the foundation deformation was stable,and there was no obvious uneven deformation or deep sliding.The uplift water level in the dam foundation was locally high,but the anti-sliding stability and foundation safety could still meet the requirements.Furthermore,the seepage stability of the foundation rock mass could meet the requirements,the dam seepage flow decreased year by year,and the effluent was clear.The operation behavior of the dam foundation was normal,which could provide reference for dam foundation treatment and seepage prevention design under similar complex geological conditions.

关 键 词：挠曲核部破碎带 重力坝 抗滑稳定 渗透稳定 变形 

分 类 号：TV698.1[水利工程—水利水电工程]