考虑固体颗粒压缩变形的城市固体废弃物本构模型

doi:10.13722/j.cnki.jrme.2014.1271

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摘要目前，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。

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	冯世进1
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	邓英军1

关键词 ：土力学；修正剑桥模型；城市固体废弃物；本构模型；应力&ndash, 应变关系；三轴排水试验

Abstract：Currently，soil models have been widely adopted to represent the waste behavior in numerical analysis for landfills. Although some aspects of waste behavior are similar to soils，a number of unique characteristics of municipal solid waste(e.g. consist of large number of compressible solid) cannot be accounted for by existing soil models. This paper aims to propose a constitutive model which can reflect the behavior of municipal solid waste more properly so that it can be applied in numerical analysis and serve for the landfill operation. On the basis of the modified Cam-clay model，a constitutive model for municipal solid waste(MSW) considering the deformation of compressible sold was established. The MSW can be divided into two parts：one part includes the incompressible solid particles and the voids，and the other parties the compressible solid particles. In detail，assume that the stress-strain behavior of the first part which includes the incompressible solid particles and the voids is elastic-plastic while the deformation of the other part which is large and irreversible is assumed to be plastic deformation. The proposed model is based on the modified Cam-clay model and the parameters in the model have clear physical meanings. It is found that the model can properly reflect the stress-strain behavior of MSW by comparing the numerical calculation results using the model with indoor triaxial drained test results of the municipal solid waste. As a result，the accuracy and rationality of the model is confirmed.

Key words： soil mechanics modified Cam-clay model municipal solid waste(MSW) constitutive model stress-strain relationship drained triaxial tests

引用本文:

冯世进1，2，邓英军1. 考虑固体颗粒压缩变形的城市固体废弃物本构模型[J]. 岩石力学与工程学报, 2015, 34(S2): 4360-4365.
FENG Shijin1，2，DENG Yingjun1. CONSTITUTIVE MODEL FOR MUNICIPAL SOLID WASTE CONSIDERING THE DEFORMATION OF COMPRESSIBLE SOLID. , 2015, 34(S2): 4360-4365.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1271 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4360

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