摘要
本文首先假定垃圾土内无机物的密度不变,在考虑降解率变化的情况下,围绕密度、质量与体积三者关系,推导了垃圾土一维降解沉降模型,并利用该模型计算由于降解作用引起的体积变化。然后结合垃圾土的孔隙度方程、垃圾土骨架的可变形性以及填埋气体的可压缩性,应用岩土力学和渗流力学理论,建立以气体压力、质点位移为基本变量的气固耦合渗流数学模型。运用软件对该数学模型进行数值模拟,模拟结果表明,填埋场气压与填埋时间和有机物的初始体积百分含量有关,随两者的增加而逐渐减小。
In this paper,the inorganic matter density was assumed to be less changeable.A single–dimensional degradation settlement model involves the relationship between density,quality and volume of municipal solid waste while the effect of degradation ratio change has been presented.So the volume change has been acquired with this model.Then,a coupled equation combined with the porosity equation has been established.This equation considered the deformable framework and the landfill gas condensability.Besides,this model makes use of the theory of rock mechanics and seepage dynamics.Then,the software was applied to numerical simulation.The results showed that the pressure in the landfill was influenced by time and organic matter volume percentage,and the pressure gradually diminished with increasing time and organic matter volume percentage.
出处
《地球与环境》
CAS
CSCD
北大核心
2011年第2期209-214,共6页
Earth and Environment
基金
重庆大学研究生科技创新基金(200811A1B0060295)
关键词
降解沉降
填埋气体
耦合
渗流
数值模拟
degradation settlement
landfill gas
coupling
seepage
numerical simulation
