垃圾土蠕变-降解特性的室内试验研究

Creep-degradation properties of municipal solid waste in laboratory tests

通过室内蠕变-降解对比试验,研究了城市固体废弃物(MSW)的长期变形过程,详细地分析了MSW应变、沉降速率以及孔隙比随时间的变化规律。试验结果显示,考虑有机物降解情况下沉降速率与时间在双对数坐标下呈线性关系;不同的生物降解条件下MSW的变形特性表现出不同的规律。研究表明,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沉降变形过程,为室内进一步研究垃圾土的蠕变降解特性提供了很好的依据。

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, settlement rate changing against time, and the relationship between stress and strain of MSW were studied. The logarithmic settlement rate is linear with respect to the logarithmic time considering degradation of MSW. It can be concluded that the creep properties of MSW is not related with stress but also with decomposition of organic fraction 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.