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基于高压直流电法的填埋场渗漏检测原理的研究
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摘要
依据填埋场的结构及电学特性,对基于高压直流电法的填埋场渗漏检测原理进行了研究。建立了填埋场直流电路模型,指出填埋场电路模型由膜上供电电极至漏洞之间的电阻、漏洞电阻和膜下土壤电阻三部分组成,推导了膜上供电电极至漏洞之间的电阻表达式,分析了回路电阻的影响因素并进行了实验验证。提出了一种新型的漏洞检测模型,对防渗膜上、下媒质中的电势分布进行了正演推导。指出由于防渗膜的高阻特性,膜上电势只与供电电流和流入漏洞的电流有关,膜下电势则由流出漏洞的电流决定。防渗膜的厚度和膜下土壤电阻率对膜上电势分布不产生影响,膜上供电电流对膜下电势分布也不产生影响。此外,对双衬层填埋场中的电势分布进行了研究,建立了漏洞电流模型,推导了检测层中的电势表达式。
According to the structure and electrical properties of landfill, the leakage detection principle of landfill based on high voltage direct current method was studied. Firstly, A direct current circuit model for landfill was set up. In this model, three parts of resistance was involved, namely, the resistance between the power supply electrode and the leak, the leak resistance and the soil resistance under the geomembrane liner. The resistance expression between the power supply electrode and the leak was derived. Factors that affect the circuit resistance also were analyzed and validated by experiments. Then, a new leak detection model was advanced. The electric potential in the medium above and under the geomembrane liner was forward deduced. The potential above the liner was determined by the power supply current and the current inflow in the leak, whereas, the potential under the liner was related with the current outflow from the leak. The liner thickness and the soil resistivity under the liner had no impact on the potential above the liner. The power supply current also did not affect the potential under the liner. In addition, a leak current model for double-lined landfills was put forward. The potential expression in the detection layer was deduced.
引文
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