生物反应器填埋场中水平沟回灌渗滤液非饱和–饱和渗流分析  

Unsaturated-saturated seepage analysis for leachate recirculation using horizontal trenches in bioreactor landfills

作　　者：冯世进[1,2] 张旭[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2013年第7期1355-1361,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家重点基础研究发展计划(973计划)课题(2012CB719803);国家自然科学基金项目(41072201;41172245;4122021);上海市浦江人才计划项目(11PJD021)

摘　　要：水平沟回灌是生物反应器填埋场中渗滤液回灌的主要模式之一,为研究水平沟回灌时生物反应器填埋场中渗滤液的非饱和–饱和运移规律,垃圾体的饱和与非饱和区域采用不同水流控制方程,饱和区域的水流控制方程采用饱和Richards方程,对垃圾体非饱和区域,由质量守恒原理,以修正的Darcy定理为基础,结合Elagroudy等提出的垃圾体沉降模型,建立了考虑垃圾体沉降的非饱和渗滤液运移控制方程。基于建立的考虑沉降特性的二维非饱和–饱和水平沟回灌计算模型,研究了水平沟回灌时渗滤液在生物反应器填埋场中的运移规律,提出水平沟回灌系统的设计方法。The horizontal trench is one of the main methods which are available to recirculate leachates.To study the unsaturated-saturated seepage laws during leachate recirculation process,different flow control equations are used for the saturated/unsaturated zones in bioreactor landfills.The saturated Richards’ equation is adopted as the flow governing equation in the saturated area of the waste mass.For the unsaturated area of the waste mass,based on the law of conservation of mass,the modified Darcy’s law and the Elagroudy’s settlement model,a new flow governing equation considering solid waste settlement is developed.Based on the two-dimensional saturated/unsaturated model which has been developed considering solid waste settlement,the migration laws of recirculated leachates are studied.The simulated results indicate that the various parameters（i.e.,settlement of MSW,pressure head,initial void ratio,etc.） have effects on the zone of impact,pressure head,water content of MSW and recirculation leachate volume per m of trench length.The design method of horizontal trenches is proposed for the bioreactor landfills.

关 键 词：生物反应器填埋场 渗滤液回灌 水平沟 运移规律 

分 类 号：TU43[建筑科学—岩土工程]