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垃圾填埋场传统封顶和ET封顶的比较研究
引用本文:陆海军,栾茂田,张金利.垃圾填埋场传统封顶和ET封顶的比较研究[J].岩土力学,2009,30(2):509-514.
作者姓名:陆海军  栾茂田  张金利
作者单位:大连理工大学,土木水利学院,大连,116024;大连理工大学,海岸和近海工程国家重点实验室,大连116024
摘    要:针对传统压实黏土封顶系统存在易干燥开裂的问题,提出了一种新型的ET(蒸发传输)封顶系统。分析了压实黏土封顶系统和新型ET封顶系统的工作机制。在降水和蒸发循环补给的条件下,建立了水分在两种封顶系统中迁移的一维数学模型。以9次降水和蒸发循环补给为边界条件,分别模拟了576 h的水分在两种封顶系统中迁移变化规律。计算结果表明,距补给边界越近,含水率受降水、蒸发的影响越显著,且随着深度的增加出现明显的峰值滞后现象。传统封顶中的压实黏土层由于具有低渗透性,致使整层不能得到有效的水分补给。ET封顶中整个土层可以有效地从边界降水中得到补给,同时在蒸发的条件下,把土层中的储水释放。数值计算结果与试验数据的对比表明,计算值和试验数据基本吻合。这些研究成果有助于垃圾填埋场封顶系统的设计作进一步的改进。

关 键 词:压实黏土  封顶系统  干燥开裂  蒸发蒸腾  土壤含水率
收稿时间:2007-05-18

Research on comparison between traditional compacted clay and evapotranspiration cover systems of landfill
LU Hai-jun,LUAN Mao-tian,ZHANG Jin-li.Research on comparison between traditional compacted clay and evapotranspiration cover systems of landfill[J].Rock and Soil Mechanics,2009,30(2):509-514.
Authors:LU Hai-jun  LUAN Mao-tian  ZHANG Jin-li
Institution:1. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 2. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China
Abstract:The traditional compacted clay cover system of landfill is studied for desiccation cracks. A new evapotranspiration (ET) landfill cover system is proposed. The mechanisms of compacted clay and ET cover are analyzed. On the basis of considering precipitation and evaporation, a one-dimensional vertical unsaturated soil moisture movement model is developed. The model is used to predict 576h moisture distribution law under 9 charge periods. Results show that the moisture content near the surface is highly sensitive to climate loading; and the effect is significantly attenuated and time lagged along with increasing depth. The compacted clay layer of the traditional landfill cover has low penetrability; so it can not get effective moisture charge. ET cover acts as a reservoir that stores moisture during precipitation events and subsequently returns it to atmosphere as evapotranspiration. It is reasonable agreement between model simulation and measured data. According to this analysis, these results may be used to assist in making decisions regarding proposed modification to the design of the cover system.
Keywords:compacted clay  cover system  desiccation cracks  evapotranspiration  soil moisture content
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