面板坝周边缝三向测缝计测值异常分析及建议  

Analysis of monitoring value anomaly for three directions joint meter on peripheral joint in CFRD and suggestions

作　　者：吕高峰[1] 邓邦龙[2] LU Gaofeng DENG Banglong(Large Dam Safety Supervision Center, National Energy Administration of PRC, Hangzhou 311122, China Hubei Qingjiang Hydropower Development Co. , Ltd. , Yichang 443000, China)

机构地区：[1]国家能源局大坝安全监察中心,浙江杭州311122 [2]湖北清江水电开发有限责任公司,湖北宜昌443000

出　　处：《人民长江》2017年第6期92-94,共3页Yangtze River

摘　　要：面板坝周边缝的剪切量是评价面板周边缝止水安全的重要指标。某面板坝运行多年后,某一周边缝三向测缝计的剪切量和开合度测值过程线呈现接近对称分布。通过对仪器计算原理和监测中间成果分析可知,三向测缝计中边长D的异常变化是造成上述现象的主要原因,该类型三向测缝计的监测成果易受任一边长的测量误差影响。为准确判断面板坝周边缝止水结构的安全性,建议在靠近河谷两岸剪切变形较大等部位的周边缝三向测缝计附近增设沿剪切方向的单向测缝计。The shear of the peripheral joint in CFRD is an important index for evaluating the water seal safety of the peripheral joint. After many years operation of a CFRD, the graph of the measured shear value and opening - closing degree is close to sym- metrical distribution. Through the analysis of instrument calculation principle and monitoring results, we found that the abnormal changes of side length D in three directions joint meter was the main cause of the above phenomenon. The monitoring results of three directions joint meter are easily affected by the measurement error of any side. In order to accurately judge the safety of wa- ter seal structure of the peripheral joint, it is suggested to add several unidirectional joint meters along the shear direction near three directions joint meters of both river banks where the shear deformation is large.

关 键 词：周边缝 三向测缝计 止水 剪切量 面板坝 

分 类 号：TV698[水利工程—水利水电工程]