基于行波ELM的填埋场渗漏定位方法

RESEARCH ON LANDFILL LEAKAGE LOCATING METHOD BASED ON TRAVELING WAVE ELM

提出了基于行波ELM的生活垃圾填埋场渗漏检测方法。将新型同轴电缆以平行等间距的方式铺设在HDPE膜下土壤层中,由于垃圾渗滤液的腐蚀作用,导致同轴电缆的绝缘保护层和介质层的物理性质发生改变,从而造成实心导体层和金属屏蔽层在渗漏处短路,并产生暂态行波。从暂态电流行波中提取行波固有频率主成分进行初步渗漏定位,并利用ELM的回归特性减小渗漏区电缆中因分布电感、分布电容变化产生的检测误差。实验结果显示:同轴电缆信号能量传输集中,行波频率法定位精度不受渗漏距离的影响,经ELM优化后的渗漏定位最大误差为0.535%。

This paper proposed a method for detecting leakage in domestic waste landfill based on traveling wave ELM method.The new coaxial cables were laid in parallel and evenly spaced in the soil layer under the HDPE film.Due to the corrosion effect of the landfill leachate,the physical properties of the insulating protective layer and the dielectric layer of the coaxial cable were changed,thereby resulting in a solid conductor layer and the metal shield was short-circuited at the leaking plot and then generated a transient traveling wave.The main components of the traveling wave spectrum were extracted from the transient current traveling wave for preliminary leakage positioning.The regression characteristics of the ELM were used to reduce the detection error caused by the variation of distributed inductance and distributed capacitance in the cable in the leakage zone.The experimental results showed that the signal energy transmission of coaxial cable was concentrated,the positioning accuracy of traveling wave frequency method was not affected by the leakage distance,and the maximum error of leakage positioning after ELM optimization was 0.535%.