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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。
Under the condition of long-term compression, the variation of the porosity of municipal solid waste is different from the soil in traditional soil mechanics. The change of the porosity of the rubbish is affected by biodegradation and stress compression at the same time. Based on the first-order kinetic hydrolysis model of municipal solid waste biodegradable components, two biodegradation models of municipal solid waste were established: one component biodegradation model and multi-component biodegradation model. Based on the biodegradation model and the stress-strain model, the calculation model of the porosity of municipal solid waste is proposed. By analyzing the changes of porosity under different long-term stresses (10, 50, 100, 200, 400 and 800 kPa), the effects of different biodegradation models and the components and degradation characteristics of the waste on the porosity variation were comprehensively compared. For the domestic MSW, the predicted porosity variation based on the multi-component biodegradation model is consistent with the analysis results of the single-component biodegradation model. The porosity increases with the long-term compression and degradation. However, compared with the single-component biodegradation model, the multi-component biodegradation model can better reflect the influence of the degradability of trash components and degradable components on the variation of porosity.