基于双电极法的土工膜缺陷探测数值模拟
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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。
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.
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.
引文
[1]MLLER W W.HDPE Geomembranes in Geotechnics[M].Berlin:Springer,2007.
[2]《土工合成材料工程应用手册》编写委员会.土工合成材料工程应用手册[M].北京:中国建筑工业出版社,2000:118-127.
[3]岑威钧,温朗昇,和浩楠.水库工程防渗土工膜的强度、渗漏与稳定若干关键问题[J].应用基础与工程科学学报,2017,25(6):1183-1192.
[4]岑威钧.土石坝防渗(复合)土工膜缺陷及其渗漏问题研究进展[J].水利水电科技进展,2016,36(1):16-22.
[5]NOSKO V,TOUZE-FOLTZ N.Geomembrane Liner Failure:Modeling of Its Influence on Contaminant Transfer[C]∥Proceedings of the 2nd Euro Geo Geosynthetics Conference.Bologna,October 15-18,2000:557-560.
[6]GIROUD J P.Design of Geotextiles Associated with Geomembranes[C]∥Proceedings of the 2nd International Conference on Geotextiles.Las Vegas:NV,August 1-6,1982:37-42.
[7]高康,兰吉武.电学渗漏探测法用于垃圾填埋场防渗土工膜施工的破坏分析[J].环境卫生工程,2008,16(1):16-18.
[8]岑威钧,和浩楠,温朗昇.防渗土工膜的缺陷特性与缺陷渗漏研究进展[J].河海大学学报(自然科学版),2017,45(1):36-44.
[9]岑威钧,和浩楠,李邓军.土工膜缺陷对土石坝渗流特性的影响及控制措施[J].水利水电科技进展,2017,37(3):61-65,71.
[10]岑威钧,耿利彦,和浩楠.防渗土工膜缺陷探测方法述评[J].河海大学学报(自然科学版),2018,46(1):43-51.
[11]王斌,汪苹.垃圾填埋场衬层渗漏检测方法[J].北京工商大学学报(自然科学版),2004,22(4):5-7,19.
[12]刘会肖,刘景良,高康.电学土工膜渗漏检测在垃圾卫生填埋场的应用[J].环境卫生工程,2007,15(4):5-6,10.
[13]CJJ/T 214-2016,生活垃圾填埋场防渗土工膜渗漏破损探测技术规程[S].北京:中国建筑工业出版社,2016.
[14]刘松玉,查甫生,于小军.土的电阻率室内测试技术研究[J].工程地质学报,2006,14(2):216-222.
[2]《土工合成材料工程应用手册》编写委员会.土工合成材料工程应用手册[M].北京:中国建筑工业出版社,2000:118-127.
[3]岑威钧,温朗昇,和浩楠.水库工程防渗土工膜的强度、渗漏与稳定若干关键问题[J].应用基础与工程科学学报,2017,25(6):1183-1192.
[4]岑威钧.土石坝防渗(复合)土工膜缺陷及其渗漏问题研究进展[J].水利水电科技进展,2016,36(1):16-22.
[5]NOSKO V,TOUZE-FOLTZ N.Geomembrane Liner Failure:Modeling of Its Influence on Contaminant Transfer[C]∥Proceedings of the 2nd Euro Geo Geosynthetics Conference.Bologna,October 15-18,2000:557-560.
[6]GIROUD J P.Design of Geotextiles Associated with Geomembranes[C]∥Proceedings of the 2nd International Conference on Geotextiles.Las Vegas:NV,August 1-6,1982:37-42.
[7]高康,兰吉武.电学渗漏探测法用于垃圾填埋场防渗土工膜施工的破坏分析[J].环境卫生工程,2008,16(1):16-18.
[8]岑威钧,和浩楠,温朗昇.防渗土工膜的缺陷特性与缺陷渗漏研究进展[J].河海大学学报(自然科学版),2017,45(1):36-44.
[9]岑威钧,和浩楠,李邓军.土工膜缺陷对土石坝渗流特性的影响及控制措施[J].水利水电科技进展,2017,37(3):61-65,71.
[10]岑威钧,耿利彦,和浩楠.防渗土工膜缺陷探测方法述评[J].河海大学学报(自然科学版),2018,46(1):43-51.
[11]王斌,汪苹.垃圾填埋场衬层渗漏检测方法[J].北京工商大学学报(自然科学版),2004,22(4):5-7,19.
[12]刘会肖,刘景良,高康.电学土工膜渗漏检测在垃圾卫生填埋场的应用[J].环境卫生工程,2007,15(4):5-6,10.
[13]CJJ/T 214-2016,生活垃圾填埋场防渗土工膜渗漏破损探测技术规程[S].北京:中国建筑工业出版社,2016.
[14]刘松玉,查甫生,于小军.土的电阻率室内测试技术研究[J].工程地质学报,2006,14(2):216-222.