南水北调与水利科技
南水北調與水利科技
남수북조여수리과기
SOUTH-TO-NORTH WATER
2009年
6期
282-285
,共4页
郭秀军%张盟%罗辉%李永顺%李典基%蒋莆伟
郭秀軍%張盟%囉輝%李永順%李典基%蔣莆偉
곽수군%장맹%라휘%리영순%리전기%장보위
渠道衬砌%混凝土厚度%介电模型%探地雷达
渠道襯砌%混凝土厚度%介電模型%探地雷達
거도츤체%혼응토후도%개전모형%탐지뢰체
Channel Lining%thickness of concrete%dielectric model%GPR
根据南水北调东线渠道衬砌混凝土两种典型配比制作了不同组分试验样块,利用探地雷达法(GPR)通过实测反射走时计算得到样块介电常数.基于试验结果研究确定了两种配比混凝土符合的介电模型和介电常数随龄期变化特征,给出了混凝土电磁波速模型估算公式,实现了混凝土厚度快速测定.实例证实速度模型公式可直接用于混凝土薄板厚度GPR检测中,检测相对误差小于10%.
根據南水北調東線渠道襯砌混凝土兩種典型配比製作瞭不同組分試驗樣塊,利用探地雷達法(GPR)通過實測反射走時計算得到樣塊介電常數.基于試驗結果研究確定瞭兩種配比混凝土符閤的介電模型和介電常數隨齡期變化特徵,給齣瞭混凝土電磁波速模型估算公式,實現瞭混凝土厚度快速測定.實例證實速度模型公式可直接用于混凝土薄闆厚度GPR檢測中,檢測相對誤差小于10%.
근거남수북조동선거도츤체혼응토량충전형배비제작료불동조분시험양괴,이용탐지뢰체법(GPR)통과실측반사주시계산득도양괴개전상수.기우시험결과연구학정료량충배비혼응토부합적개전모형화개전상수수령기변화특정,급출료혼응토전자파속모형고산공식,실현료혼응토후도쾌속측정.실예증실속도모형공식가직접용우혼응토박판후도GPR검측중,검측상대오차소우10%.
According to compositions of the two lining concrete used in the east route of South-to-North Water Transfer Project, some concrete samples have been made and teated with GPR to get the reflect time, then the relatively dielectric constants were calculated with their thickness and reflect time. Based on the testing results, representative dielectric models of lining concrete was confirmed, meanwhile the rule of relatively dielectric constant varying with the mixing age also was pointed out. Furthermore the velocity formulae of GPR were made with the composition dielectric of concrete and its volume content. Examples showed the velocity formulae of GPR could be used to calculate thickness of concrete lin-ing well and quickly, the relative error of calculated thickness was under 10%.