从无机物质量不变出发，在考虑降解率与密度变化的情况下，围绕垃圾土的密度、质量与体积三者关系，结合由自配试样进行降解试验获得的降解率规律，推导了垃圾土一维降解压缩模型。研究结果表明，降解压缩量与初始时刻有机物的体积百分含量、降解率及初始高度有关，且成正比关系。利用该模型对重庆市某垃圾填埋场的有机物降解沉降量进行了计算，可以看出降解沉降量与时间呈指数函数关系，在填埋初期降解沉降速率较大，随着时间推移，降解沉降量趋于稳定。

By the law of conservation of mass, onedimensional municipal solid waste(MSW) degradation model was proposed with considering the degradation and density fluctuation, the relationship between density, quality and volume and the degradation characteristics obtained from the degradation test.With the analysis, it was found that the settlement of degradation was positive proportional with the following three elements: the volume percentage of organic matter, the rate of degradation and the initial height.As a case study, the degradation settlement of Chongqing MSW landfill was predicted.And it was found that the relationship between the settlement and the time showed exponential attenuation trend, in which the degradation settlement of MSW landfill was large in the initial stages, and then it gradually stabilized with the time.

重庆大学研究生科技创新基金项目(200811A1B0060295)