【摘要】：為研究運(yùn)行期填埋場(chǎng)深度填埋條件下偶極子滲漏檢測(cè)和漏洞定位的可行性,通過(guò)系統(tǒng)分析運(yùn)行期填埋場(chǎng)的結(jié)構(gòu)特征和漏洞特征,建立了偶極子檢測(cè)的概念模型、控制方程和定解條件;基于Comsol Multiphysics高仿真數(shù)值模擬軟件對(duì)上述問(wèn)題進(jìn)行有限元求解,并根據(jù)現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)對(duì)模擬結(jié)果進(jìn)行驗(yàn)證,最后利用該模型討論了運(yùn)行期填埋場(chǎng)偶極子漏洞檢測(cè)和定位的可行性及影響因素.結(jié)果表明:數(shù)值模型模擬的特征點(diǎn)(極大值點(diǎn)和極小值點(diǎn))與實(shí)際測(cè)量點(diǎn)位的y坐標(biāo)(電勢(shì)差分值)相對(duì)誤差最大為24.95%,x坐標(biāo)(距離)相對(duì)誤差最大為3.40%,表明模型及其求解方法合理,可用于模擬實(shí)際的偶極子檢測(cè).在深度填埋(堆體厚度最大15 m)條件下,堆體表面電勢(shì)差分信號(hào)降至m V級(jí)別,超出傳統(tǒng)銅電極+萬(wàn)用表的檢出限.受填埋深度影響,堆體表面電勢(shì)分布特征與庫(kù)底電勢(shì)分布特征差異較大,電勢(shì)峰值點(diǎn)位置相差達(dá)8.0 m,偶極子裝置雖可檢測(cè)出庫(kù)底漏洞的存在,但是不能準(zhǔn)確對(duì)其定位(x方向偏移2.0 m,y方向偏移8.0 m).此外,堆體表面的地形起伏會(huì)形成偽漏洞信號(hào),干擾漏洞識(shí)別;沿測(cè)線(xiàn)方向平行移動(dòng)電極,測(cè)線(xiàn)上的漏洞信號(hào)也會(huì)同時(shí)移動(dòng),并且關(guān)于實(shí)際漏洞位置對(duì)稱(chēng).研究顯示,在運(yùn)行期填埋場(chǎng)條件下,傳統(tǒng)偶極子漏洞定位方法(即直接根據(jù)測(cè)線(xiàn)上的異常信號(hào)進(jìn)行漏洞定位)不再適用,但可以通過(guò)平行移動(dòng)地表電極位置,觀察地表電極移動(dòng)過(guò)程中疑似漏洞信號(hào)的對(duì)稱(chēng)中心來(lái)進(jìn)行漏洞定位.
[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(guó)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(guó)家科技支撐計(jì)劃項(xiàng)目(2014BAL02B00) 國(guó)家環(huán)境保護(hù)公益性行業(yè)科研專(zhuān)項(xiàng)重點(diǎn)項(xiàng)目(201209022) 國(guó)家自然科學(xué)基金項(xiàng)目(61503219)
【分類(lèi)號(hào)】：X705

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