填埋场及邻近地层中温度和气体压力的耦合模拟  

Coupled simulation of temperature and gas pressure in landfill and nearby geological area

作　　者：张纬[1] 薛强[1] 胡竹云[1] 刘磊[2] 

机构地区：[1]武汉工业学院多孔介质力学研究所,湖北武汉430023 [2]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《辽宁工程技术大学学报（自然科学版）》2008年第A01期116-117,共2页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(50309015);湖北省自然科学基金计划青年杰出人才项目(2007ABB039);武汉市科技攻关计划项目(200860423196);地质灾害防治与地质环境保护国家重点实验室资助项目(GZ2006-03)

摘　　要：基于多孔介质渗流力学和热力学理论,从填埋场内非等温的角度,考虑填埋场污染气体的产生和运移,建立了填埋场内热质传输的耦合数学模型,给出了针对模型控制方程的数值离散方法。模拟结果表明:由于填埋场内热量产生的不均衡性,导致了温度分布的不均匀,进而产生的温度梯度对填埋场内污染气体压力的空间分布及时间变化产生了不可忽略的影响。而在邻近地层中,温度和气压的变化速率都较填埋场内的慢,这是由于选取了较低的气体渗流率和温度传导系数的缘故。该耦合模型的提出及相关分析不仅可为填埋场内污染气体的产生和运移研究提供理论支持,而且对相关控制参数的分析和填埋气体收集系统的设计有着重要的实践意义。Based on the theory of mechanics of porous seepage and thermodynamics with consideration of the non-isothermal condition, a fully coupled heat and mass transfer numerical model describing the variation and distribution of temperature and gas pressure within landfill is established. Calculation of temperature and gas pressure is conducted simultaneously according to the coupled dynamic condition of landfill. The results of simulation show that as time moves on, the temperature and gas pressure.within landfill are both ascending to a stable level before their gradual decline which accords with the basic understanding of landfill dynamic system. As for the nearby geological area, both temperature and gas pressure are changing slowly due to the lower gas permeability and thermal conductivity used in this area. The model could be utilized for investigating transportation of temperature and gas in landfill along with the nearby geological area, and the analysis of pressure distribution under the non-isothermal condition is also significant to designing and building of the LFG recovery systems and liner systems considering temperature impacts.

关 键 词：填埋场 温度 气体压力 

分 类 号：X705[环境科学与工程—环境工程]