基于优势流效应的填埋场渗沥液回灌过程预测  

Prediction of Leachate Injection in Landfill Based on Preferential Flow Effect

作　　者：梁冰[1] 张柴 刘磊[2,3] LIANG Bing;ZHANG Chai;LIU Lei(School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science,Wuhan 430071,China)

机构地区：[1]辽宁工程技术大学力学与工程学院,阜新123000 [2]中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,武汉430071 [3]中国科学院武汉岩土力学研究所-香港理工大学固体废弃物科学联合实验室,武汉430071

出　　处：《科学技术与工程》2021年第8期3399-3406,共8页Science Technology and Engineering

基　　金：国家自然科学基金面上项目(41977254);湖北省自然科学基金创新群体项目(2019CFA012);武汉市科技成果转化专项(2018060403011348)。

摘　　要：渗滤液回灌对于补充垃圾堆体水分及加速降解稳定化具有重要的促进作用,垃圾堆体的非均质性和大孔隙特征造成了渗沥液流动过程出现显著的优势流效应。以双渗透率模型为基础,开展典型回灌工艺条件下垃圾堆体中渗沥液的分布规律预测研究。预测结果表明:一定限度内增大回灌速率、回灌频率、回灌量、初始含水量等因素可提高渗滤液的影响深度、入渗量和贮水率;优势流模型较传统的单域模型,区分了具有高导水性的裂隙域和高持水性的基质域,渗滤液可以更快地通过裂隙入渗、流动和排出,更符合垃圾堆体内水分多域流动行为模式;裂隙域和基质域的水分质量交换项是动态平衡的,随深度而减小。Leachate injection has an important role in promoting water replenishment and accelerating degradation and stabilization of landfill.The inhomogeneity and large pore characteristics of garbage piles have caused significant dominant flow effects in the leachate flow process.Based on the dual permeability model,a prediction study on the distribution of leachate in the waste heap under typical recharge process conditions was carried out.The prediction results show that increasing the injection rate,injection frequency,injection volume,initial water content,and other factors within a certain limit can increase the influence depth,infiltration volume,and water storage rate of the leachate.Compared with the traditional single domain model,the preferential flow model distinguishes the fracture domain with high water conductivity from the matrix domain with high water retention.Leachate can infiltrate,flow and discharge through cracks more quickly,and it is more in line with the flow behavior model of water multi-domain in waste.The water mass exchange term in the fracture and matrix domain are dynamically balanced and decreases with depth.

关 键 词：优势流 生物反应器填埋场 渗滤液回灌 水分迁移 

分 类 号：X131.3[环境科学与工程—环境科学]