基于优势流及各向异性随上覆压力变化的填埋体饱和渗流模型
发布时间：2018-09-18 08:51
【摘要】：生活垃圾由于组成成分的多样性及分层填埋,其孔隙呈不均匀分布,并且水平向多于竖向。填埋体中的渗流存在明显的优先流效应,各向异性显著并受上覆压力等因素影响。基于Poiseuille方程,根据上覆压力作用下生活垃圾孔隙形状、孔隙尺寸分布及孔隙排列方向分布特征,提出了基于优先流及各向异性的饱和渗流模型。揭示了新鲜生活垃圾分布变化规律,0~200 k Pa,大孔隙逐渐消失,平均孔隙直径与可排水孔隙率呈指数下降,孔隙排列角度逐渐水平向倾斜。采用新建饱和渗流模型进行分析计算,确定采用可排水孔隙率可比总孔隙率更好地模拟垃圾孔隙渗流特性。渗流由大孔隙优先流主导,0~600 k Pa内计算获得新鲜垃圾水平向饱和渗透系数变化范围为10~(-2)~10~(-5)cm/s。给出了渗流各向异性值的计算公式,渗流各向异性值大体随上覆压力增加而增大,并与初始孔隙排列角度相关;0~600 k Pa内计算得新鲜垃圾渗流各向异性值变化范围为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.
【作者单位】： 浙江大学岩土工程研究所;浙江省丽水市环境监测中心站;
【基金】：国家自然科学基金项目(51578503) 国家重点基础研究发展计划(“973”计划)项目(2012CB719801)
【分类号】：TU43
本文编号：2247396
[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.
【作者单位】： 浙江大学岩土工程研究所;浙江省丽水市环境监测中心站;
【基金】：国家自然科学基金项目(51578503) 国家重点基础研究发展计划(“973”计划)项目(2012CB719801)
【分类号】：TU43
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1 李桂梅;;地层上覆压力对储层岩石孔隙度、渗透率的影响规律研究[J];内江科技;2012年09期
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