中文摘要：

在长期压缩条件下,城市生活垃圾孔隙率的变化规律不同于传统土力学中的土,垃圾孔隙率的变化同时受到生化降解和应力压缩的影响。基于城市生活垃圾可降解组分一阶动力学水解模型,分析建立了两种城市生活垃圾生化降解模型：单一组分生化降解模型和多组分生化降解模型。在生化降解模型和应力降解压缩模型基础上,提出了城市生活垃圾孔隙率计算模型。通过分析不同上覆应力（10,50,100,200,400,800 kPa）长期作用下的孔隙率变化,综合比较了不同生化降解模型以及垃圾组分和降解特性对孔隙率变化规律的影响。对于国内现阶段生活垃圾而言,多组分生化降解模型基础上预测的孔隙率变化规律与单一组分生化降解模型的分析结果一致,孔隙率随着长期压缩和降解的进行逐渐增加。然而,相比于单一组分生化降解模型,多组分生化降解模型更能反映垃圾组分及可降解组分降解能力对孔隙率变化规律的影响。

英文摘要：

The porosity change behaviors of municipal solid wastes（MSWs） are different from those of soils in the conventional soil mechanics,and they are influenced by both the solid mass loss due to biodegradation and the compression caused by surcharge load.Based on first-order kinetics,two different biodegradation models including single-component biodegradation model and multi-component biodegradation model are introduced for the modeling of solid mass loss in MSWs.Through the biodegradation model and a stress-age coupled compression model for MSWs,a porosity prediction model is presented.The change of porosity with time during biodegradation and long-term compression under different surcharge loads（10,50,100,200,400 and 800 kPa） is analyzed for different biodegradation models and MSWs with different compositions.For the current fresh MSWs in China,the porosity change behaviors predicted by means of the single-component biodegradation model and the multi-component biodegradation model are the same.It shows that the porosity increases with time during biodegradation under long-term compression.However,the porosity prediction model based on the multi-component biodegradation model can reflect the direct effect of waste composition and biodegradability on porosity change behaviors.