土工膜渗漏定位方法研究

The Method of Leakage Location in Geomembrane Liner

对偶极子法电极形状和外形尺寸以及其他影响定位的因素进行了深入研究.结果表明:偶极子的检测电压与偶极子的外形尺寸关系不大.偶极子检测电压最大值出现在偶极子中心与漏洞的距离等于偶极子间距的1/2处,并且偶极子的间距越大,检测电压越高.偶极子下沿距离HDPE膜越近,检测电压变化越明显.在多漏洞的情况下,当偶极子的间距小于漏洞间距时,2个漏洞都能被检测出来;当2个漏洞间距小于偶极子间距时,将可能漏检1个漏洞.膜上供电电极的位置对漏洞定位有一定的影响,在测量时应尽可能将供电电极远离测量区.

Researches on the factors that influence leak location including figure and dimension of dipole electrodes have been done. The results showed that： There is no major relationship between the detection voltage of dipole electrodes and the figure dimension of dipole electrodes. The maximal detection voltage of dipole electrodes is in the place where has 1/2 length of dipole electrode space to leak. And the bigger is the space of dipole electrodes, the higher is the detection sensitivity, but the lower is the detection precision. The nearer is the underside of the dipole electrodes to the HDPE liner, the more obviously does the detection voltage change. The precision of the multi-leak location is relative to the space of dipole electrodes, and when leaks are located at separations approximately equal to or less than the dipole detector space, the resolution is poor. The position of the power supply electrodes on the liner has some effect on leak location, so during the course of detection, the power supply electrodes should be placed where has long distance to the detecting area.