【摘要】：生活垃圾由于組成成分的多樣性及分層填埋,其孔隙呈不均勻分布,并且水平向多于豎向。填埋體中的滲流存在明顯的優(yōu)先流效應(yīng),各向異性顯著并受上覆壓力等因素影響�；赑oiseuille方程,根據(jù)上覆壓力作用下生活垃圾孔隙形狀、孔隙尺寸分布及孔隙排列方向分布特征,提出了基于優(yōu)先流及各向異性的飽和滲流模型。揭示了新鮮生活垃圾分布變化規(guī)律,0~200 k Pa,大孔隙逐漸消失,平均孔隙直徑與可排水孔隙率呈指數(shù)下降,孔隙排列角度逐漸水平向傾斜。采用新建飽和滲流模型進(jìn)行分析計(jì)算,確定采用可排水孔隙率可比總孔隙率更好地模擬垃圾孔隙滲流特性。滲流由大孔隙優(yōu)先流主導(dǎo),0~600 k Pa內(nèi)計(jì)算獲得新鮮垃圾水平向飽和滲透系數(shù)變化范圍為10~(-2)~10~(-5)cm/s。給出了滲流各向異性值的計(jì)算公式,滲流各向異性值大體隨上覆壓力增加而增大,并與初始孔隙排列角度相關(guān);0~600 k Pa內(nèi)計(jì)算得新鮮垃圾滲流各向異性值變化范圍為1~10。
[Abstract]:Due to the diversity of compositional components and stratified landfills, the pores of MSW are distributed unevenly and more horizontally than vertically. The seepage in landfill has obvious preferential flow effect, anisotropy is obvious and is affected by overlying pressure and so on. Based on Poiseuille equation, a saturated seepage model based on preferential flow and anisotropy is proposed according to the characteristics of pore shape, pore size distribution and pore arrangement direction distribution under overlying pressure. It is revealed that the distribution and variation of fresh domestic solid waste (MSW) gradually disappear, the average pore diameter and drainable porosity decrease exponentially, and the pore arrangement angle gradually tilts horizontally. The new saturated percolation model is used to analyze and calculate, and it is determined that the drainage porosity is better than the total porosity in simulating the porous percolation characteristics of garbage. The horizontal saturated permeability coefficient of fresh waste calculated by percolation within 600k Pa dominated by macroporous preferential flow is in the range of 10 ~ (-2) ~ (-5) ~ (-5) cm/s.. The calculation formula of seepage anisotropy value is given. The seepage anisotropy value increases with the increase of overlying pressure, and the variation range of the anisotropy value of fresh garbage seepage is calculated within 600k Pa, which is related to the initial pore arrangement angle.
【作者單位】： 浙江大學(xué)巖土工程研究所;浙江省麗水市環(huán)境監(jiān)測(cè)中心站;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51578503) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“973”計(jì)劃)項(xiàng)目(2012CB719801)
【分類號(hào)】：TU43

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