垃圾填埋场中土壤水分滞后效应的影响因素

Influencing factors of hysteresis effect in landfill

为定量描述垃圾填埋场中土壤水分变化情况,必须考虑滞后效应的影响。对填埋场分层填土及封场后表层覆土的滞后效应进行了数值模拟,并对土壤水分特征曲线模型参数进行了灵敏度分析,结果表明:质地对滞后的影响明显,颗粒越细,曲线斜率越大;随着α的增大,土壤水分特征曲线右移,α越大,滞后现象越明显。通过滞后效应对垃圾土壤水分运移的影响规律的研究,可为室内试验和现场试验参数的选取和测定提供理论依据。

The influence of hysteresis effect must be considered to describe the movement of soil water quantitatively. The numerical simulation on the layered filling and surface soil is presented under hysteresis effect. The sensitivities of model parameters are analyzed. The numerical results show that the effect of texture is significant, the smaller the soil particles, the steeper the curve. With the increase of paramater alpha ,the curve moves to right, and the larger the alpha, the clearer the effect of hysteresis. Research on the hysteresis effect of landfill soil can offer theoretical foundation for the measurement of the basic parameters in the laboratory and on the site.