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中文摘要：
在大三轴固结排水剪试验研究的基础上，提出了城市固体废弃物（MSW）的复合指数应力-应变模型。该模型参数少且有明确的物理意义，既可反映MSW在小应变情况下的非线性变形特性，也可反映其在大应变情况下的明显应变硬化特性。采用有限差分程序FLAC内置的Fish语言将复合指数应力-应变模型耦合入FLAC程序，并通过三轴压缩试验数值模拟得到了验证。最后利用该模型分析了某填埋场在竖向扩建堆体荷载作用下的应力压缩沉降、侧向变形以及新老填埋场交界面处中间衬垫系统的应变。结果表明：复合指数模型的计算结果总体上位于莫尔-库仑模型和邓肯-张模型之间；中间衬垫系统的拉伸应变可能导致压实黏土层发生破坏。
英文摘要：
A composite exponential stress-strain model of municipal solid waste （MSW） is proposed based on the large-scale consolidated drained triaxial tests. Few parameters are contained in this model and each one has specific physical meaning. It can not only reflect the non-linear characteristics of the stress-strain curves for MSW within small strains, but also the apparent strain-harden characteristics of the stress-strain curves for MSW within larger strains. This model is incorporated into the explicit finite difference program FLAC by the Fish language and verified by numerical modelling of triaxial tests. Finally, A vertical landfill expansion case is analyzed using this model, and the mechanical settlement and lateral deformation of the old landfill and the strain of the intermediate liner induced by the expanded MSW loads are evaluated. It shows that the calculated results using the composite exponential model are almost between those using the Mohr-Coulomb model and the Duncan-Chang model. The tensile strain of the intermediate liner may cause tension cracks in the compacted clay liner.
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