多层复合衬里界面剪切特性试验研究

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英文篇名：Experimental Study on Interfacial Shear Properties of Multi-layer Composite Liner 作者：贺建清 ; 王康康 ; 廖湘华 ; 王永华 ; 高文华 英文作者：HE Jian-qing;WANG Kang-kang;LIAO Xiang-hua;WANG Yong-hua;GAO Wen-hua;Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology;Xiangtan City Administration and Administrative Law Enforcement Bureau; 关键词：垃圾填埋场 ; 复合衬里 ; 界面 ; 大型直剪仪 ; 剪切特性 ; 抗剪强度 英文关键词：landfill;;composite liner;;interface;;large direct shear apparatus;;shear characteristics;;shear strength 中文刊名：KYGC 英文刊名：Mining and Metallurgical Engineering 机构：湖南科技大学岩土工程稳定控制与健康监测省重点实验室;湘潭市城市管理和行政执法局; 出版日期：2019-02-15 出版单位：矿冶工程 年：2019 期：v.39;No.185 基金：国家自然科学基金(41272324);; 湖南省自然科学基金(2017JJ4039) 语种：中文; 页：KYGC201901003 页数：6 CN：01 ISSN：43-1104/TD 分类号：14-19

摘要

为研究复合衬里界面的剪切特性,取得具有代表性的界面抗剪强度参数,利用自行研制的大型直剪仪进行了复合衬里界面剪切试验,结果表明,法向应力相同的条件下,土工布/土工膜界面的抗剪强度最低,土工膜/GCL界面次之;土工膜/GCL界面内摩擦角最小,土工布/土工膜界面次之。饱水状态下,各界面的内摩擦角均有不同程度降低,其中土工膜/GCL界面降幅最大,降低了30.98%,土工布/土工膜界面次之,降低了29.66%。浸水饱和会导致土工布/土工膜界面、土工膜/GCL界面粘聚力降低,土工布/土工膜界面的粘聚力降低了44.51%,土工膜/GCL界面降低了6.89%;其余界面的粘聚力均有不同程度的增加。在工程实际中,应尽可能避免土工布/土工膜界面、土工膜/GCL界面处于饱水状态,以保证土工布/土工膜界面、土工膜/GCL界面强度满足垃圾填埋场稳定要求。
        In order to investigate interfacial shear characteristics of composite liner for obtaining the typical interfacial shear strength parameters, interfacial shear test was conducted for the composite liner by using a large self-developed direct shear apparatus. The results showed that, with the same normal stress, the geotextile/geomembrane interface had the lowest shear strength, with the geomembrane/GCL interface coming next, while the geomembrane/GCL interface had the smallest internal friction angle compared to the geotextile/geomembrane interface. Under the saturated state, the internal friction angle of interfaces all decreased to a different extent. It was shown that the internal friction angle of geomembrane/GCL interface decreased by 30.98%, while that for geotextile/geomembrane interface decreased by 29.66%. The saturation after soaking resulted in the cohesive force of geotextile/geomembrane interface and geomembrane/GCL interface reduced by 44.51% and 6.89%, respectively, while the cohesive force for other interfaces increased to some extent. It is concluded that geotextile/geomembrane interface and geomembrane/GCL interface should be prevented from being water-saturated as much as possible, so as to ensure the interfacial strength meeting the requirement for a landfill.

引文

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