渠道衬砌混凝土介电特征研究及工程应用

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发布时间：2022-04-16

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摘要：为构建南水北调东线调水果道衬砌混凝土介电常数模型，实现基于探地雷达(GP)技术的混凝土厚度、含水
量和强度量化检测，参考两种鲁遍采用的渠道衬砌混凝土配比制作不同尺寸和组分试块，利用GPR反射波测量试块
介电常数，研究介电常数随龄期变化特征。研究结果表明渠道衬脚混凝土相对介电常数在短龄期内特合钱性模型，
完全失水凝圈后特合CRIM模型：混凝土电磁波速整体随含水量增大呈指数降低，但在浇筑后的6~14d,对应混凝土
实际体积含水量7%一12%阶段，含水量变化不会引起电磁波速明显变化，这|过程和水分丧失形式相关：虽然混凝
土电磁波速和超声波速非对应，但仍可评价混凝土层平均抗压孩度。这些新认识在实小清河混凝土输水箱涵浇
筑质量GPR检测解译解释中得到应用，表现出良好的适用性。
关键词：衬砌混凝土：含水量：强度：介电模型：探地雷达
中国分类号：TU528
文献标识码：A
文章编号：167447642011)S上007905
Research and Application on Dielectric Properties of
Water Channel Lining Concrete with GPR Method
GUO Xiu-jun',WANG Miao',LU S ha ng-qing2,Li Dian-ji2
1.College of Environmental Science Engineering.Ocean University of China,Qingdao 266100,Shandong.P.R.China;
2.Qingdao Urban Const ruetion Group,Qingdao 266003,Shandong.P.R.China;
3.South to North Water Diversion Office of Shandong Province,Jinan 250000,Shandong.P.R.China)
Abstract:In order to make an exact dielectric model of channel lining concrete in east line of South to North water diversion
oroject,realize the measurement of conerete thickness,water cont ent,and strength with ground propagation radar (GPR)
echnology,we made conerete slabs with different sizes and constit uents aceording to two proportions which are universally used
n channel lining,and then measure the electromagnetic w ave propagation velocity with GPR reflect method,analyzed relation
oetw een the dielectric constant and time after fresh mixing.The results show concrete didectric constant obeys linear model in
short time after mixing,while the CRIM model seems to be able to simulate the permittivity of conerete after complete
lesiccation;GPR wave veleity of concrete decreases with the water content increasing,but in the time of 6 to 14 days after
resh mixing.corresponding the volumetric water content of 7%to 12%.the decreasing of w ater content would not affect GPR
ave velocity obviously,this process is related to the mode of water seattering.Although there is no exact relevant relation
etw een GPR wave veocity and strength,it could reflect the average compressive strength.These new theories were used in
nterpret of GPR data of water diversion concree culvert in Xiaoqinghe River and it shows good applicability.
Key words:channel lining concrete:w ater content;strength;dieleetrie model:GPR