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目前,土体本构模型被广泛应用于有关垃圾填埋场的数值分析中,虽然城市固体废弃物的一些性质与土体相似,但城市固体废弃物的一些特有性质(如含有大量可压缩固体颗粒)是现有土体本构模型不能反映的。提出一个能够反映城市固体废弃物力学行为的本构模型,以应用于数值分析,更好地为垃圾填埋场的运营服务。在修正剑桥模型的基础上,通过考虑城市固体废弃物中的部分固体颗粒的可压缩性,建立城市固体废弃物的本构模型。模型将城市固体废弃物分为2部分:一部分包括颗粒不可压缩的固体废弃物与孔隙,另一部分为颗粒可压缩的固体废弃物。不可压缩的固体成份与孔隙组成的部分假设为弹塑性变形;颗粒可压缩的固体废弃物变形较大且不可恢复,假设为塑性变形。该模型建立在修正剑桥模型基础上,各参数具有明确的物理意义,通过将模型的数值计算结果与室内三轴排水试验结果进行比较,发现模型可以更好地反映城市固体废弃物的应力–应变特征,初步验证了模型的合理性和准确性。
At present, the constitutive model of soil is widely used in the numerical analysis of landfill sites. Although some properties of MSW are similar to the soil, some unique properties of MSW (such as containing a large amount of compressible solid Particles) is the constitutive model of soil can not be reflected. A constitutive model that reflects the mechanical behavior of municipal solid waste is proposed to be used in numerical analysis to better serve the operation of landfills. Based on the revision of the Cambridge model, a constitutive model of municipal solid waste was established by considering the compressibility of some solid particles in municipal solid waste. The model divides municipal solid waste into two parts: one part consists of particles incompressible solid waste and pores, the other part is granular compressible solid waste. Part of the incompressible solid composition and porosity is assumed to be elasto-plastic deformation; granular compressible solid waste deforms large and can not be restored, assuming plastic deformation. The model is based on the modified Cambridge model. Each parameter has a clear physical meaning. By comparing the numerical results of the model with the indoor three-axis drainage test results, it is found that the model can better reflect the stress-strain of municipal solid waste Characteristics, preliminary verified the rationality and accuracy of the model.