水布垭面板堆石坝周边缝渗流监测新技术  

Analysis of new technology for monitoring peripheral joint seepage of Shuibuya concrete faced rockfill dam

作　　者：许小东[1] 燕乔[1] 吴长彬[1] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《人民长江》2010年第14期87-89,107,共4页Yangtze River

摘　　要：将高灵敏度温度传感器埋设在面板堆石坝土石介质挡水建筑物内部的不同深度,当此处有渗流水通过时,土中热量传递的强度就发生改变,在研究此处正常地温及参考水温后,就可确定测量点处温度异常是否由漏水引起,从而找出渗漏点。水布垭大坝周边渗漏监测范围1200 m,共划分10个监测单元,每个单元内放置50-80个光纤光栅温度传感器,间距1.5-3.0 m。采用这一方法对大坝蓄水前后的渗漏情况进行监测,结果表明：水库蓄水后,监测点处温差变化不大,无明显异常变化。监测结果与实情相符。这一方法是对传统监测理论和方法的创新,可为同类工程借鉴。In order to find out the seepage point of concrete rockfill dam,the high sensitive temperature sensor can be embedded at different depths inside rock-soil media of retaining works.When seepage flow passes the transducer,the heat transfer intensity in earth will change,thus,through studying the normal earth temperature and referring water temperature,we can determine whether there is seepage-induced temperature variation at the monitoring point or not and the seepage point can be found out.The range for monitoring peripheral joints seepage of Shuibuya concrete faced rockfill dam is 1200 m,which is divided into 10 monitoring units,and 50~80 fiber grating temperature sensor are embedded in each unit with an interval of 1.5~3 m.The seepage condition of Shuibuya concrete faced rockfill dam before and after impoundment was monitored.The monitoring results show that there is no obvious temperature variation,which agrees with the practical situation.This method is an innovation for traditional monitoring,and can be referred by similar projects.

关 键 词：高面板堆石坝 周边缝 渗流监测 光纤光栅渗流监测系统 水布垭工程 

分 类 号：TV641.43[水利工程—水利水电工程]