基于磁法的雙襯層填埋場HDPE膜破損檢測研究.pdf

1、山東工商學院學位論文原創(chuàng)性聲明和使用授權說明 山東工商學院學位論文原創(chuàng)性聲明和使用授權說明原創(chuàng)性聲明 原創(chuàng)性聲明本人鄭重聲明：所呈交的學位論文，是本人在導師的指導下，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。本聲明的法律結果由本人承擔。論文作者簽名： 日期： 年 月 日學位論文使用授權說明 學位論文使

2、用授權說明本人完全了解山東工商學院關于收集、保存、使用學位論文的規(guī)定，即：按照學校要求提交學位論文的印刷本和電子版本；學校有權保存學位論文的印刷本和電子版，并向國家有關部門或機構送交論文的復印件和磁盤，提供目錄檢索與閱覽服務；本人授權山東工商學院可以將學位論文的全部或部分內容編入有關數(shù)據(jù)庫進行檢索，學?？梢圆捎糜坝?、縮印、數(shù)字化或其它復制手段保存、匯編學位論文；在非保密的論文范圍內，學?？梢怨颊撐牡牟糠只蛉績热荨＃ūＣ艿膶W位論文在解

3、密后適用本授權書）論文作者簽名： 日期： 年 月 日指導教師簽名： 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