【摘要】 利用高压直流电法进行了填埋场人工合成衬层漏洞检测,当供电电压为400,350,300V时,改变供电方向,地电模型表现出不同的电学特征.结果表明,由于高密度聚乙烯和土壤充分接触,在其接触面上形成类似于PN结的导电膜.当膜下电极为负时,模型所表现出的容性特征远超过当膜下电极为正时所表现出的容性特征.探讨了这种导电膜的形成和机理,并得出电容的大小将随着衬层面积以及电压的增加而增长的结论.更多还原

【Abstract】 The earth-electricity model expressed different electricity characteristics when the direction of supply power was changed under 400V, 350V and 300V voltage, using high voltage direct current (DC) to detect the artificial synthetic liner leakage in landfill. A conductive membrane similar to PN junction was formed on the contacted surface between high density polyethylene and the ground soil. The capacitance characteristics of the model at negative electrode under the membrane was far more than that of the model at positive electrode under the membrane. The formation and mechanism of the conductive membrane with electrolytic capacitor feature was discussed in detail. The capacitance increased as the liner area and power increased.更多还原