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首页> 外文期刊>International Journal of Environmental Research and Public Health >Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well
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Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well

机译：垂直垃圾渗滤液再循环井周围的时空孔隙水压力分布

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Addition of liquids into landfilled waste can result in an increase in pore water pressure, and this in turn may increase concerns with respect to geotechnical stability of the landfilled waste mass. While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported. Pressure readings from vibrating wire piezometers placed in the waste surrounding a liquids addition well at a full-scale operating landfill in Florida were recorded over a 2-year period. Prior to the addition of liquids, measured pore pressures were found to increase with landfill depth, an indication of gas pressure increase and decreasing waste permeability with depth. When liquid addition commenced, piezometers located closer to either the leachate injection well or the landfill surface responded more rapidly to leachate addition relative to those far from the well and those at deeper locations. After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time. Despite the large pressures present at the bottom of the liquid addition well, much smaller pressures were measured in the surrounding waste. The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.
机译：将液体添加到垃圾填埋场中会导致孔隙水压力增加，进而增加人们对垃圾填埋场的岩土工程稳定性的关注。虽然已对竖井渗滤液再循环对垃圾填埋场孔隙水压力的影响进行了数学建模，但尚未报告正在运行的垃圾填埋场中这些系统的测量结果。在2年的时间内，记录了来自佛罗里达州一个全面运营的垃圾填埋场周围的液体加注井周围废物中的振动线压计的压力读数。在添加液体之前，发现测得的孔隙压力随填埋深度的增加而增加，这表明气体压力随深度增加而废物渗透率降低。当开始添加液体时，相对于远离井眼和位于较深位置的渗滤液，位于靠近渗滤液注入井或垃圾填埋场表面的压力计对渗滤液的添加反应更快。停止添加液体后，测得的孔隙压力并没有立即下降，而是随时间缓慢下降。尽管液体添加井的底部存在很大的压力，但在周围的废物中却测得的压力要小得多。在这项研究中记录的压力的空间变化表明废物渗透率是各向异性的，并随深度而减小。

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