深度填埋條件下堆體表面電勢分布特征及漏洞定位機理
[Abstract]:In order to study the feasibility of dipole leakage detection and leak location under the condition of deep landfill, a conceptual model of dipole detection was established by systematically analyzing the structural and loophole characteristics of the landfill during operation. Governing equation and definite solution condition; The above problems are solved by finite element method based on Comsol Multiphysics high simulation numerical simulation software, and the simulation results are verified according to the field measured data. Finally, the feasibility and influencing factors of the detection and location of dipole holes in the landfill during the operation period are discussed by using the model. The results show that the maximum relative error between the characteristic point (maximum point and minimum point) and the y coordinate (potential difference fraction) of the actual measured point is 24.95x coordinate (distance), and the maximum relative error is 3.40th. It shows that the model and its solution method are reasonable and can be used to simulate the actual dipole detection. Under the condition of deep landfill (the maximum thickness of the reactor is 15 m), the potential difference signal on the surface of the reactor is reduced to MV level, which exceeds the detection limit of the traditional copper electrode multimeter. Under the influence of the landfill depth, the potential distribution on the surface of the reactor is different from that on the bottom of the reservoir, and the peak position of the potential is 8.0 m. Although the dipole device can detect the existence of the hole in the bottom of the reservoir, However, it is not possible to accurately position the location (x shift 2.0 MJ shift 8.0 m). In addition, the topographic fluctuation on the surface of the heap will result in false leak signals, which will interfere with the identification of the holes, and parallel moving electrodes along the direction of the measuring lines, the leak signals on the test lines will also move at the same time, and the location of the actual vulnerabilities will be symmetrical. The research shows that the traditional dipole vulnerability location method (that is, locating vulnerabilities directly based on abnormal signals on the line) is no longer applicable under the condition of the running landfill, but it can be used to move the surface electrode position in parallel. Observe the symmetry center of the suspected leak signal during the surface electrode movement to locate the vulnerability.
【作者單位】: 中國環(huán)境科學(xué)研究院固體廢物污染控制技術(shù)研究所;北京師范大學(xué)水科學(xué)學(xué)院;
【基金】:國家科技支撐計劃項目(2014BAL02B00) 國家環(huán)境保護公益性行業(yè)科研專項重點項目(201209022) 國家自然科學(xué)基金項目(61503219)
【分類號】:X705
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