2008年初南方冰冻低温对岩滩坝体渗漏量影响机理分析  

Impact Mechanism Analysis on the Leakage of Yantan Dam Caused by the Freezing in Southern China in Early 2008

作　　者：邢林生[1] 杜雪珍[1] 朱锦杰[1] 

机构地区：[1]国家电力监管委员会大坝安全监察中心,浙江杭州310014

出　　处：《水力发电》2010年第12期20-22,26,共4页Water Power

摘　　要：岩滩大坝坝区2008年初遭遇罕见冰冻低温天气,坝体渗漏量变化异常,突变骤增后的渗漏量约为变化前的50倍,并持续20多天,整个过程延续4个月。分析表明,低气温首先使库水温度下降,进而导致坝体温度下降,体积收缩,混凝土表层和内部微细裂隙及坝段横缝张开,致使坝体渗漏量突变骤增。溢流坝段碾压混凝土由于存在施工质量缺陷,密实度较差,在低温荷载作用下反应敏感,成为坝体渗漏量变化最为明显的部位。The dam site area of Yantan suffered a rare freezing weather for 4 months in early 2008,and the dam leakage increased to 50 times as before and lasted more than 20 days.The analysis show that the temperature drop of dam body leads to the contraction of dam concrete and the opening of micro-cracks on concrete surface and internal and the transverse joints between dam sections,and results the sudden increase on the leakage.As the poor RCC quality,the spillway sections of dam have more sensitive reaction to the low temperature and most serious leakage.

关 键 词：南方 冰冻 低温天气 岩滩 坝体 渗漏量 影响机理分析 Southern China Dam Mechanism Analysis 温度下降 施工质量缺陷 碾压混凝土 溢流坝段 突变 体积收缩 荷载作用 密实度 分析表 低气温 

分 类 号：TV73[水利工程—水利水电工程] TM612[电气工程—电力系统及自动化]