高密度电法在土质堤坝高聚物防渗墙检测中的应用研究  

Study on application of high-density electrical method to detection of high polymer cutoff wall inearthfill embankment

作　　者：徐建国[1] 张春宇[1] 王博[1] 闫林 XU Jianguo;ZHANG Chunyu;WANG Bo;YAN Lin(School of Water Resources and Environment,Zhengzhou University,Zhengzhou450002,Henan,China)

机构地区：[1]郑州大学水利与环境学院,河南郑州450002

出　　处：《水利水电技术》2018年第12期72-79,共8页Water Resources and Hydropower Engineering

基　　金：国家重点研发计划项目(2016YFC0401608);国家自然科学基金面上项目(51579226);河南省科技攻关项目(142102310059;182102210013)

摘　　要：结合实际工程采用高密度电法对新型高聚物防渗墙的完整性进行了检测。首先,对四种排列方式(施伦贝格、温纳、偶极-偶极、单极-偶极)开展对比测试分析;然后,采用二维检测方法沿坝体轴线方向布置3条测线,其中在坝顶布置2条测线,在背坡布置一条测线;最后,根据探测数据绘制电阻率反演图,用以判断高聚物防渗墙缺陷及完整性。检测结果表明:四种排列方式中施伦贝格法检测结果最可靠;单极-偶极法检测深度最大,但分辨率最差。坝体实测结果显示,从坝顶到6 m深度视电阻率较高,6～12 m视电阻率较低,说明高聚物防渗墙起到了一定的阻水作用,但仍存在缺陷,分析原因是防渗墙浸水造成的电阻率降低。本文验证了高密度电法在高聚物防渗墙完整性检测应用中的有效性。Aiming at the detection of the integrity of new type of high polymer cutoff wall,the relevant detection is made with high-density electrical method in combination with the actual project concerned.At first,the testing analysis on four electrode arrays(Schlum-berger,Wenner,Dipole-dipole,Dole-dipole)is carried out,and then three survey lines are arranged with 2-D detection method along the axis of embankment,in which two lines are arranged along its crest and one is arranged along its back-slope.Finally,the relevant resistivity inversion chart is drawn with the detected data for judging the defect and integrity of the high polymer cutoff wall.The detection result shows that among the four electrode arrays,the detection result from Schlum-berger method is the most reliable,while the detection depth of the Dipole-dipole method is the largest,but its resolution is the worst.The actual detection made on embankment exhibits that the apparent resistivity is higher from the embankment crest to the depth of 6 m and is lower from the depth of 6 m to 12 m;which indicated that the high polymer cutoff wall plays a certain water blocking role,but it still has some defects,of which the causation is that the resistivity is decreased by the inundation of the cutoff.The effectiveness of the application of high-density electric method to detection of the integrity of high polymercutoff wall is verified herein.

关 键 词：高聚物防渗墙 土质堤坝 高密度电法 完整性检测 

分 类 号：TV871.2[水利工程—水利水电工程]