城市固体废弃物变形特性的时间因素研究

Impact of Ages on Deformation Properties of Municipal Solid Waste

通过室内蠕变-降解对比试验,研究了城市固体废弃物(MSW)的变形随时间的变化过程。试验结果显示,不同的生物降解条件下MSW的变形特性表现出不同的规律,有利于生物降解条件下的变形与时间的相关性较大,也就是说随着时间的延长,MSW的蠕变变形是应力与有机物生物降解耦合作用的结果。采用室内蠕变-降解试验可以很好地模拟垃圾土的长期变形过程,为室内进一步研究垃圾土的蠕变降解特性提供很好的依据。

In order to investigate the long-term deformation properties of municipal solid waste（MSW）,a series of creep-decomposition comparative tests were conducted in the laboratory under different biodegradation conditions.Based on the experimental results,characteristics of strain changing,void ratio changing and the relationship between stress and strain of MSW were studied.An exponential model was proposed to describe the stree-strain-time relationship and the compressibility of MSW.The model parameters could characterized the compression mechanism.It can be concluded that the creep properties of MSW are not related with stress but also with decomposition of organic fraction and time by considering the stress-strain curve.Test results have proved that the creep-decomposition experimental test offered a new method for investigating the deformation properties of MSW in laboratory.