Effect of Municipal Solid Waste Leachate on Hydraulic Conductivity and Exchange Complex of Geosynthetic Clay Liners

IF 3.9 2区工程技术 Q1 ENGINEERING, GEOLOGICAL Journal of Geotechnical and Geoenvironmental Engineering Pub Date : 2014-04-01 DOI:10.1061/(ASCE)GT.1943-5606.0001050

S. L. Bradshaw, C. Benson

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引用次数: 56

Abstract

AbstractTests were conducted to assess how permeation with synthetic and real municipal solid waste (MSW) leachate affects the hydraulic conductivity and exchange complex of geosynthetic clay liners (GCLs). GCLs were arranged in a composite barrier configuration for hydration on moist compacted subgrades for 30 or 90 days. After hydration, the geomembrane and subgrade soil were removed and the GCLs were permeated with typical and strong synthetic and real MSW leachates at different confining stresses for 342 to 1,281 days (4.9 to 148.9 pore volumes of flow). For most tests, hydraulic and chemical termination criteria were met (referred to as equilibrium), and in many cases the tests were conducted long after these criteria were achieved. Hydraulic conductivity of the GCLs increased no more than 5.6 times the hydraulic conductivity to deionized water (DIW), even though more than 80% of the sodium (Na) in the bentonite was replaced by other cations [predominantly calcium (Ca) and magnesium (Mg)]. Very long ...

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城市生活垃圾渗滤液对土工合成粘土衬垫导电性和交换络合物的影响

摘要通过试验研究了人工合成和真实城市生活垃圾渗滤液对土工合成粘土衬垫(gcl)的导电性和交换复合物的影响。在湿压实路基上以复合屏障形式布置gcl水化30天或90天。水化后，去除土工膜和路基土，在不同围应力下，用典型、强合成和真实城市生活垃圾渗滤液渗透gcl，持续342 ~ 1281天(4.9 ~ 148.9孔体积)。对于大多数测试来说，水力和化学终止标准都达到了(称为平衡)，而且在许多情况下，在达到这些标准很久之后才进行测试。尽管膨润土中超过80%的钠(Na)被其他阳离子(主要是钙(Ca)和镁(Mg))所取代，但gcl的水力电导率比去离子水(DIW)的水力电导率提高不超过5.6倍。很长……

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来源期刊

Journal of Geotechnical and Geoenvironmental Engineering 工程技术-地球科学综合

CiteScore

7.50

自引率

7.70%

发文量

222

审稿时长

12 months

期刊介绍： The Journal of Geotechnical and Geoenvironmental Engineering covers the broad area of practice known as geotechnical engineering. Papers are welcomed on topics such as foundations, retaining structures, soil dynamics, engineering behavior of soil and rock, site characterization, slope stability, dams, rock engineering, earthquake engineering, environmental geotechnics, geosynthetics, computer modeling, groundwater monitoring and restoration, and coastal and geotechnical ocean engineering. Authors are also encouraged to submit papers on new and emerging topics within the general discipline of geotechnical engineering. Theoretical papers are welcomed, but there should be a clear and significant potential for practical application of the theory. Practice-oriented papers and case studies are particularly welcomed and encouraged.