基于动态高密度视电阻率法的防渗墙底界判定  

Bottom boundry detecting of cut-off wall based on dynamic high density apparent resistivity method

作　　者：雷卫佳 涂序龙 胡雄武[2] 周官群 吴小平[4] 陈兴海 董亚 LEI Weijia;TU Xulong;HU Xiongwu;ZHOU Guanqun;WU Xiaoping;CHEN Xinghai;DONG Ya(Jiepai Navigation and Electricity Hub Management Office,Jiangxi Port and Navigation Administration Bureau,Yingtan 335000,China;School of Earth and Environment,Anhui University of Science and Technology,Huainan 232001,China;Anhui Huizhou Geology Security Institute Co.,Ltd,Hefei 230000,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230000,China)

机构地区：[1]江西省港航管理局,界牌航电枢纽管理处,江西鹰潭335000 [2]安徽理工大学地球与环境学院,安徽淮南232001 [3]安徽惠洲地质安全研究院股份有限公司,安徽合肥230000 [4]中国科学技术大学地球和空间科学学院,安徽合肥230000

出　　处：《人民长江》2020年第8期209-213,共5页Yangtze River

基　　金：安徽省高等学校自然科学重点资助项目(KJ2016A192);国家重点研发计划项目(2018YFC0603500);国家自然科学基金项目(41702177,41874084,41674076);贵州省科技厅重大专项(黔科重大专项字[2018]3003-2)。

摘　　要：防渗墙广泛应用于堤坝防渗处理,为确保其抗渗能力,需对墙体底界进行检测。为提高对防渗墙底界的判定能力,提出了动态高密度视电阻率测试方法。构建了防渗墙物理模型,并在模型两侧分别布置了高密度电法测试系统和钻孔,通过测试钻孔注入盐水前后的动态电性参数,发现视电阻率及其变化率对受注水影响的地质体敏感,初步确定注水后的地质体视电阻率变化率约为15%时可作为模型底界判定的依据。工程实践进一步证实了研究方法的有效性和可靠性。Cut-off wall is widely used in anti-seepage treatment of embankment.In order to ensure its impermeability,it is necessary to detect the bottom boundary of the wall.In this paper,a dynamic high density apparent resistivity test method was proposed to improve the detecting ability of bottom boundary.Firstly a physical model of cut-off wall was constructed,and then the high density electric test system and borehole were arranged on two sides of the wall.The dynamic electrical parameters before and after borehole injection of brine were tested.It was found that the apparent resistivity and its change rate were sensitive to the geological bodies affected by water injection.When the change rate of apparent resistance of geological bodies after water injection was about 15%,it could be used as the basis for determining the bottom boundary of the wall.Engineering practice further showed the effectiveness and reliability of the research method.

关 键 词：防渗墙底界 高密度电法 视电阻率 防渗墙无损检测 

分 类 号：TV543[水利工程—水利水电工程]