填埋场封场覆盖层水分传输的动态规律研究  

Study on Dynamic Law of Water Transport in Landfill Overburden

作　　者：龚龙飞[1] 薛强[1] 李艳[1] 刘建军[1] 

机构地区：[1]武汉工业学院多孔介质力学研究所,武汉430023

出　　处：《系统仿真学报》2011年第7期1359-1362,共4页Journal of System Simulation

基　　金：国家自然科学基金(50874102);国家十一五科技支撑项目(2006bac06b0);湖北省自然科学基金计划青年杰出人才项目(2007ABB039);湖北省重大科技开发项目(2008AC008)

摘　　要：为保证填埋场的安全运行及控制垃圾渗滤液的产量,垃圾填埋场通常建有封场覆盖层。封场覆盖层中水分的动态变化是关系到封场系统能否有效运行的至关重要的问题。在考虑降水、蒸发循环补给的边界条件下,建立了水分在封顶系统中运移的数学模型,并采用此模型预测了11次蒸发、降水循环补给边界作用下,封场覆盖系统中土壤含水率的变化。另外,对降水强度、降水持续时间进行了参数分析。数值计算结果表明,整个覆盖封顶系统中含水率对边界变化响应的灵敏程度随土层深度的延伸而逐渐减弱,其中反应最为敏感的是最上层的植被层;当降雨强度为10cm/h,持续时间达到14.5小时,水分将穿透整个封顶覆盖系统。Plant in vegetation layer and head pressure in garbage filling-burying body are directly affected by the dynamic distribution of water in every layer of capping-covering system.It has large damage potential to the whole impervious system of landfill and increases using cost of landfill and the risk of groundwater pollution.Mathematical model of water migration in the ceiling system was established by considering boundary conditions of precipitation and evaporating circulation replenishment.Parameter analysis was taken in intensity and duration of precipitation and initial soil moisture.The numerical results show that moisture content of vegetation layer is more sensitive to boundary change.When rain intensity is up to 10cm/h and rain duration is up to 14.5 hours,the moisture will penetrate the whole capping-covering system,and the impervious system of landfill will be damaged.

关 键 词：垃圾填埋场 封顶覆盖系统 水分传输 数值仿真 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]