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中文摘要：
考虑上覆土体的土拱效应及衬垫的大变形,将下卧土体局部沉陷条件下的复合衬垫系统分为滑动区和沉陷区。建立了其受力变形分析模型,并以衬垫系统的最大拉应变作为控制标准,建立了工程上衬垫系统的抗沉陷设计方法。利用该分析模型研究了滑动区衬垫界面强度、衬垫上覆土体的厚度、重度、有效内摩擦角等参数和衬垫结构形式的影响,发现上覆土体厚度、重度及有效内摩擦角对衬垫受力变形影响很大,而衬垫的抗拉刚度直接决定了其拉应变大小。结合工程实例进行了衬垫系统的抗沉陷设计,并建议了衬垫的抗沉陷结构形式。
英文摘要：
Taking into account the soil-arching effect and large deformation of liners, a model of force and deformation analysis was presented for the geosynthetic liner system subjected to local subsidence. Taking the maximum tensile strain of the liner system as the control parameter, the design method of the liner system resisting the local subsidence was given for the engineering application. Effects of shear strength of the liner system, the thickness, the bulk density, the effective internal friction angle of the overlaying soil and the structural configuration of the liner system were studied using the proposed model. It was shown that the thickness, the bulk density and the effective internal friction angle of the overlaying soil could greatly influence the force and deformation of the liner system, and the tensile strain of the liner system mostly depended on its tensile stiffness. The coving system and the liner system between the old and expanded landfills were designed to resist the local subsidence for the vertical expansion of a given valley landfill, and the reasonable structural configurations of the coving system and the liner system were recommended.
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