中文摘要：

为模拟城市固体废弃物（MSW）考虑生化降解的力-气耦合沉降过程,从MSW的生化降解规律、力-气耦合相互作用两个方面分别进行研究。通过对MSW生化降解试验的分析,提出描述MSW生化降解规律新的公式,力-气耦合相互作用模型中结合了Darcy定律、Fick定律、理想气体状态方程、多孔介质流体运移理论、有效应力原理,通过非饱和土气相本构模型对时间的偏导将耦合作用表达和气体运移联系起来,MSW的应力-应变关系采用了考虑蠕变作用的Gibson和Lo流变模型。该模型结合降解沉降得到的解答能够反映孔隙气压力和总沉降的变化规律。模型验证结果表明,模型计算结果和试验结果能比较好的吻合,由于降解作用,孔压值在初始阶段会迅速上升,达到最大值后又逐渐下降,对于9.5 kPa恒载作用下的填埋体,最终应变可以达到16.7%。

英文摘要：

For the coupled mechanical-gas settlement model and calculation for MSW by considering biodegradation,two aspects are presented here： biodegradation laws and coupling effects.A new model to express the decomposition is proposed by analyzing the data of biodegradation experiments.The model for the coupled mechanical-gas effects combines the Darcy law,the Fick law,the ideal gas law,the principles of effective stress and the theory of dynamics of fluids in porous media.The coupling effects and gas movement are linked by the unsaturated gas constitutive theory.The Gibson and Lo＇s model is adopted as the constitutive model.The proposed coupled model with biodegradation settlement can reflect the rules of total settlement and gas pressure.The results show that the settlement can reach 16.7% of the initial height for a constant load of 9.5 kPa.Because of the biodegradation,gas pressure will increase at the beginning to the top value,and then decrease.The proposed model can fit the experimental data very well.