填埋气体迁移气-热-力耦合动力学模型的研究

基于连续介质力学—势弹性力学原理，运用多场耦合理论建立了填理场中可压缩垃圾气体迁移耦合的动力学模型，并采用摄动法及积分变换法对该强非线性数学模型进行拟解析求解。通过算例对比分析，探讨了耦侵动力场中气压、温度和应力变化对可压缩气体迁移的影响，得出了垃圾气体迁移过程中的孔隙压力分布规律。结果表明，三场耦合作用与非耦合作用相对差别较大，耦合效应不能忽略。这为定量化研究垃圾气体在填埋场中的扩散状况以及污染气体的排放和收集、防止二次污染提供了可靠的理论依据。

Dynamical Modeling Study on Coupling between Vapor-Heat-Mechanics in Landfill Gas Transportion

A dynamical coupling model of solid waste gas transport in landfill is established based on the theory of continuum mechanics, thermoelastic material mechanics, and the multi fields coupling theory. Using the method of the perturbation and integral transform, an approximate analytical solution of the nonlinear mathematical model is obtained. The effects of gas pressure, temperature and strain in coupling dynamics field on compressed gas transform are studied. The pore pressure distribution in the process of solid waste gas transform is calculated in an example. The results make clear that the differences of coupling action and uncoupling action are obvious and the effects of coupling cannot be ignored. The result in the paper can be used for studies of diffusion of solid waste gas in landfill, the polluted gas collecting and preventing secondary pollution.