长江科学院院报 ›› 2019, Vol. 36 ›› Issue (2): 97-100.DOI: 10.11988/ckyyb.20170790

• 岩土工程 • 上一篇    下一篇

基于双电极法的土工膜缺陷探测数值模拟

岑威钧1,2,罗佳瑞1,都旭煌1,和浩楠3,耿利彦1   

  1. 1.河海大学 水利水电学院,南京 210098;
    2.水利部堤防安全与病害防治工程技术研究中心,郑州 450003;
    3.河北省水利水电第二勘测设计研究院,石家庄 050021
  • 收稿日期:2017-07-10 修回日期:2017-08-04 出版日期:2019-02-01 发布日期:2019-03-11
  • 作者简介:岑威钧(1977-),男,浙江慈溪人,副教授,博士,主要从事水工渗流分析与控制及土石坝抗震方面的研究。E-mail: hhucwj@163.com
  • 基金资助:
    国家自然科学基金项目(51679073) ;江苏省自然科学基金项目(BK20141418);水利部堤防安全与病害防治工程技术研究中心开放课题基金项目(2018004)

Numerical Simulation of Defect Detection of Geomembrane Based on Dual-electrode Method

CEN Wei-jun1,2, LUO Jia-rui1, DU Xu-huang1, HE Hao-nan3, GENG Li-yan1   

  1. 1.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;
    2.Research Center on Embankment Safety and Disaster Prevention Engineering Technology, Ministry of Water Resources, Zhengzhou 450003,China;
    3.The Second Design and Research Institute of Water Conservancy and Hydropower of Hebei Province, Shijiazhuang 050021, China
  • Received:2017-07-10 Revised:2017-08-04 Online:2019-02-01 Published:2019-03-11

摘要: 利用电场与渗流场控制方程及边界条件相似的原理,对含缺陷的防渗土工膜上的电位分布进行有限元模拟,获得缺陷附近的电位分布特征,进而判断缺陷位置。此外,对电极埋设位置、施加电压值和探测间距等因素进行敏感性分析。计算结果表明:双电极法可有效确定土工膜缺陷位置,土工膜缺陷越靠近励磁电源电极,越有利于缺陷的准确探测;沿着缺陷中心线方向进行探测,可高效探测缺陷位置;移动探测仪的电极间距应以探测长度的5%~10%为宜。研究成果对双电极法用于土工膜缺陷探测有理论指导意义。

关键词: 土工膜, 缺陷探测, 电极位置, 探测间距, 数值模拟

Abstract: In the light of the similarity of governing equation and boundary condition between electric field and seepage field, the potential distribution on the surface of defective impermeable geomembrane was simulated via finite element approach. The anomaly potential distributions in the vicinity of defect were obtained to determine the location of defect. In addition, sensitivity analysis of the buried position of electrode, excitation voltage, and dipole spacing were taken into account. The computed results demonstrate that the defect in the geomembrane can be accurately located by using pole-dipole electrical survey methods. The detection of defect is more effective for a closer distance between the defect and the electrode; the detection efficiency can be increased when the detective line is along the center line of defect. The results also show that the dipole spacing of 5%-10% of the length of survey line is appropriate for detecting the defect in geomembrane. The calculated results are of theoretical guiding significance for the application of pole-dipole electrical survey methods to the detection of geomembrane defect.

Key words: geomembrane, defect detection, location of electrode, detection distance, numerical simulation

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