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中文摘要：
结合苏州七子山垃圾填埋场的工程项目,通过室内试验量测垃圾饱和渗透系数和土-水特征曲线,推导其渗透性函数,考虑存在中间覆盖层和截洪沟失效的情况,通过对垃圾填埋体中非饱和-饱和渗流分析,研究填埋单元内的水分运移规律以及中间覆盖层上局部滞水的形成规律。计算结果表明：填埋体中非饱和区域的基质吸力大多保持在3～6kPa,对应的垃圾体积含水量为35%～40%,与实测含水量一致,说明推导出的渗透性函数可用于垃圾的非饱和-饱和渗流分析;中间覆盖层的存在可以大大降低雨水入渗量,但当截洪沟失效时,中间覆盖层是造成局部滞水的重要原因,计算得到的水位与现场测试结果相吻合。
英文摘要：
Combined with a project carried out at Qizishan landfill in Suzhou,the status of leachate in the landfill was investigated;and the saturated hydraulic conductivity and soil-water characteristic curve of municipal solid waste were measured in laboratory.The hydraulic conductivity function was deduced using Campbell′s equation.Then unsaturated-saturated seepage analyses were carried out to investigate the movement of water in a landfill element,in which the existence of intermediate covers and the efficiency of cutoff ditch were considered.The obtained results show that matric suction in unsaturated zone of the landfill remains between 3 kPa and 6 kPa,with the corresponding volumetric water content between 35% and 40%.This is consistent with the borehole investigation,which shows that the deduced hydraulic conductivity function was applicable to simulate the seepage of leachate in municipal solid waste.The existence of intermediate covers can significantly reduce the infiltration of rainfall into a landfill element.But it becomes an important factor that causes perched leachate as the ineffectiveness of cutoff ditch is concerned.The obtained results are also consistent with those of field investigation.
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