基于磁法的雙襯層填埋場HDPE膜破損檢測研究.pdf

1、山東工商學(xué)院學(xué)位論文原創(chuàng)性聲明和使用授權(quán)說明 山東工商學(xué)院學(xué)位論文原創(chuàng)性聲明和使用授權(quán)說明原創(chuàng)性聲明 原創(chuàng)性聲明本人鄭重聲明：所呈交的學(xué)位論文，是本人在導(dǎo)師的指導(dǎo)下，獨立進行研究工作所取得的成果。除文中已經(jīng)注明引用的內(nèi)容外，本論文不含任何其他個人或集體已經(jīng)發(fā)表或撰寫過的作品或成果。對本文的研究做出重要貢獻的個人和集體，均已在文中以明確方式標明。本聲明的法律結(jié)果由本人承擔(dān)。論文作者簽名： 日期： 年 月 日學(xué)位論文使用授權(quán)說明 學(xué)位論文使

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3、密后適用本授權(quán)書）論文作者簽名： 日期： 年 月 日指導(dǎo)教師簽名： 日期： 年 月 日IIAbstractAt present, there is no applicable method for the detection of the leakage of theunderlayer film of the double liner landfill. Only the landfill with the detection ele

4、ctrodegrid laid before can be detected by the electrode grid method. But the cost of layingelectrode grids is high and difficult to promote in large-area landfills. Based on thefeasibility study of subsurface membrane da

5、mage detection in landfills based on magneticmethods, the main research method is to combine the physical characteristics of thelandfill and the electromagnetic properties to establish a COMSOL physical model formagnetic

6、 detection of landfills. The magnetic field characteristics of the loopholes areanalyzed through simulation. Signals and their influence factors and influence laws.Studies have shown that when high-voltage direct current

7、 is applied on both sides of thelower HDPE film, the magnetic detection sensor can detect a hole signal in the air abovethe leak to achieve hole location. The magnetic signals of the loopholes cause changes inthe magneti

8、c vectors BX, BY, and BZ and the flux density modes, in which the changetendency of the flux density modulus is the most obvious, and it is insensitive to thedirection and is suitable for the leakage detection at the sit

9、e of the landfill.The magnetic field signal of the leak has the following characteristics: The magneticflux density model at the leak has obvious changes, showing that the center of the leak hasa minimum value and each s

10、ide has a maximum value. Through the analysis of theinfluence factors of the magnetic field, the following conclusions are obtained: 1. Thehigher the current intensity, the stronger the magnetic field signal at the looph

11、ole; 2. Themagnetic field signal of the suspected loophole will be generated by the power supplyelectrode. The actual detection electrode should be far from the detection area; 3. In therange, the greater the distance be

12、tween the detection sensors, the stronger the measuredmagnetic field signal of the leak and the greater the leak location error.By analyzing the source and noise characteristics of the landfill noise, the magneticfield n

13、oise of the landfill can be removed by using preprocessing, differential filtering andpower frequency filtering. The prototype system of the detection system was developed.The site verification was performed in a landfil