降解和压缩作用下垃圾土气体渗透率非线性定量表征模型研究

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英文篇名：Study of Nonlinear Quantitative Characterization Model of Gas Permeability under Degradation and Compression 作者：曾刚 ; 王婧 ; 胡丹 ; 马骏 英文作者：Zeng Gang;Wang Jing;Hu Dan;Ma Jun;School of Civil Engineering & Architecture,Hubei Univ.of Arts & Science;State Key Laboratory of Geomechanics & Geotechnical Engineering, Institute of Rock & Soil Mechanics, Chinese Academy of Sciences; 关键词：垃圾土 ; 降解 ; 压缩 ; 气体渗透率 ; 表征模型 英文关键词：municipal solid waste;;degradation;;compression;;gas permeability;;quantitative characterization model 中文刊名：三峡大学学报(自然科学版) 英文刊名：Journal of China Three Gorges University(Natural Sciences) 机构：湖北文理学院土木工程与建筑学院;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; 出版日期：2019-06-25 08:50 出版单位：三峡大学学报(自然科学版) 年：2019 期：04 基金：国家自然科学基金(41772342);; 湖北省自然科学基金(2017CFB203);; 湖北省教育厅科学技术研究项目(Q20172604) 语种：中文; 页：38-42 页数：5 CN：42-1735/TV ISSN：1672-948X 分类号：X705;TU411.4

摘要

垃圾土的气体渗透特性是填埋气体灾变控制与资源化利用的重要参数.基于垃圾土气体渗透率-孔隙度关系的幂函数模型和复合压缩模型,建立了考虑降解和压缩作用的垃圾土气体渗透率定量表征模型,分析了压缩系数、生化降解应变和生化降解速率常数等参数对气体渗透率定量表征模型的演化规律和影响机理,并探讨了应变对孔隙度,以及幂指数对气体渗透率模型的影响规律.分析结果表明:随着压缩系数的增大,气体渗透率数值减小幅度较大,可达到2个数量级;生物降解应变对气体渗透率定量表征模型的影响主要是后期的降解沉降阶段,且随着生物降解应变的增大,气体渗透率不断的减小;生物降解速率常数对气体渗透率定量表征模型的影响主要在中间降解阶段,且随着生物降解速率常数的增大而减小;随着应变的增大,孔隙度降低的幅度较大,数值可达到初始值的0.4倍;随着应变的增大,气体渗透率是不断减小,且减小幅度随着幂指数的增大而不断增大,可达2个数量级.
        Gas permeation characteristic of municipal solid waste(MSW)is an important parameter for the control and resource utilization of landfill gas. Based on the power function model of gas permeability and porosity and composite compression model relationship of MSW, a quantitative characterization model of gas permeability of MSW considering degradation and compression is established. The evolution rule and influence mechanism of the gas permeability quantitative characterization model with compression coefficient, biochemical degradation strain and biochemical degradation rate constant are analyzed. The effects of strain on porosity and power exponent on gas permeability model are also discussed. The results show that with the increase of compression coefficient, the gas permeability decreases greatly, which can reach two orders of magnitude. The influence of biochemical decomposition strain on the quantitative characterization model of gas permeability is mainly at the later stage of degradation settlement; and the gas permeability decreases with the increase of biodegradation strain. The influence of biodegradation rate constant on the quantitative characterization model of gas permeability is mainly in the intermediate degradation stage and decreases with the increase of biodegradation rate constant. With the increase of strain, the porosity decreases greatly; and the value can reach the initial value of 0.4 times. As the strain increases, the gas permeability decreases; and the decrease amplitude increases with the increase of power exponent, which can reach two orders of magnitude.

引文

[1] Zeng G,Liu L,Xue Q,et al.Experimental Study of the Porosity and Permeability of Municipal Solid Waste[J].Environmental Progress & Sustainable Energy,2017,36(6):1694-1699.
    [2] 刘磊.垃圾填埋气体热释放传输的动力学规律研究[D].阜新:辽宁工程技术大学,2009:2-3.
    [3] Sanchez R,Tsotsis T T,Sahimi M.Computer Simulation of Gas Generation and Transport in Landfills.IV Modeling of Liquid-gas Flow[J].Chemical Engineering Science,2010,65:1212-1226.
    [4] 薛强,刘磊.垃圾填埋气体运移的多场耦合理论及应用[M].北京:科学出版社,2012:1-2.
    [5] 陈云敏,施建勇,朱伟,等.环境岩土工程研究综述[J].土木工程学报,2012,45(4):165-182.
    [6] 彭绪亚,余毅,刘国涛.垃圾填埋场竖井抽气条件下的填埋气压分布[J].重庆大学学报,2003,26(1):92-95.
    [7] 魏海云.城市生活垃圾填埋场气体运移规律研究[D].杭州:浙江大学,2007:6.
    [8] 薛强,赵颖,刘磊,等.垃圾填埋场灾变过程的温度-渗流-应力-化学耦合效应研究[J].岩石力学与工程学报,2011,30(10):1970-1988.
    [9] 彭绪亚,余毅.填埋垃圾体气体渗透特性的实验研究[J].环境科学学报,2003,23(4):530-534.
    [10] 魏海云,詹良通,陈云敏.城市生活垃圾的气体渗透性试验研究[J].岩石力学与工程学报,2007,26(7):1408-1415.
    [11] Hossain M S,Penmethsa K K,Hoyos L.Permeability of Municipal Solid Waste in Bioreactor Landfill with Degradation[J].Geotechnical and Geological Engineering,2009,27:43-51.
    [12] Stoltz G,Gourc J P,Oxarango L.Liquid and Gas Permeability of Unsaturated Municipal Solid Waste Under Compression[J].Journal of Contaminant Hydrology,2010,118(1-2):27-42.
    [13] 易富,许越,刘磊,等.垃圾堆体固有渗透与孔隙度协同演化特征实验研究[J].环境工程学报,2014,8(5):2091-2096.
    [14] 曾刚,刘磊,熊辉,等.生活垃圾降解过程中固有渗透率变化特性研究[J].土木工程学报,2015,48(S2):337-340.
    [15] 施建勇,赵义.气体压力和孔隙对垃圾土体气体渗透系数影响的研究[J].岩土工程学报,2015,37(4):586-593.
    [16] Stoltz G,Gourc J P,Oxarango L.Characterisation of the Physico-Mechanical Parameters of MSW[J].Waste Management,2010,30(8/9):1439-1449.
    [17] 冯世进,焦阳,郑奇腾.考虑垃圾体成层性的渗滤液回灌运移规律[J].地下空间与工程学报,2014,10(6):1263-1269.
    [18] Marques A C M ,Filz G M,Vilar O M.Composite Compressibility Model for Municipal Solid Waste[J].Journal of Geotechnical and Geo-environmental Engineering,2003,129(4):372-378.