水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2014年
3期
30-33
,共4页
易富%许越%田宇%姜丰洋
易富%許越%田宇%薑豐洋
역부%허월%전우%강봉양
垃圾填埋气体%抽气井%气固耦合模型%气体收集效能
垃圾填埋氣體%抽氣井%氣固耦閤模型%氣體收集效能
랄급전매기체%추기정%기고우합모형%기체수집효능
landfill gas%extraction well%gas-solid coupling model%efficiency of gas collection
为分析填埋场上覆载荷引起的变形沉降以及垃圾自身降解作用对气体迁移特性的影响,采用多孔介质气固耦合和生物降解理论,构建了填埋气体迁移的H-M耦合模型,通过数值模拟方法分析有无载荷作用对填埋气体储存及迁移规律的影响。结果表明：考虑载荷作用时,底部气体的压力值明显高于顶部,且底部与顶部气体压力差值的变化趋势较无载荷作用时更明显；随着填埋年限的增加,填埋场内部气体压力逐渐降低；考虑载荷作用时场内气体压力值高于不考虑载荷作用的情况,封场1a后二者气体压力差值为0.045 kPa,但10 a后压力差值达0.346 kPa；考虑载荷作用时气井收集量比不考虑载荷作用时高14.8%；载荷的作用在一定的程度上增大了抽气井影响半径的辐射范围。因此,上覆载荷引起的沉降变形对垃圾填埋气体的收集量影响显著,在设计填埋气体收集控制系统时应考虑该因素。
為分析填埋場上覆載荷引起的變形沉降以及垃圾自身降解作用對氣體遷移特性的影響,採用多孔介質氣固耦閤和生物降解理論,構建瞭填埋氣體遷移的H-M耦閤模型,通過數值模擬方法分析有無載荷作用對填埋氣體儲存及遷移規律的影響。結果錶明：攷慮載荷作用時,底部氣體的壓力值明顯高于頂部,且底部與頂部氣體壓力差值的變化趨勢較無載荷作用時更明顯；隨著填埋年限的增加,填埋場內部氣體壓力逐漸降低；攷慮載荷作用時場內氣體壓力值高于不攷慮載荷作用的情況,封場1a後二者氣體壓力差值為0.045 kPa,但10 a後壓力差值達0.346 kPa；攷慮載荷作用時氣井收集量比不攷慮載荷作用時高14.8%；載荷的作用在一定的程度上增大瞭抽氣井影響半徑的輻射範圍。因此,上覆載荷引起的沉降變形對垃圾填埋氣體的收集量影響顯著,在設計填埋氣體收集控製繫統時應攷慮該因素。
위분석전매장상복재하인기적변형침강이급랄급자신강해작용대기체천이특성적영향,채용다공개질기고우합화생물강해이론,구건료전매기체천이적H-M우합모형,통과수치모의방법분석유무재하작용대전매기체저존급천이규률적영향。결과표명：고필재하작용시,저부기체적압력치명현고우정부,차저부여정부기체압력차치적변화추세교무재하작용시경명현；수착전매년한적증가,전매장내부기체압력축점강저；고필재하작용시장내기체압력치고우불고필재하작용적정황,봉장1a후이자기체압력차치위0.045 kPa,단10 a후압력차치체0.346 kPa；고필재하작용시기정수집량비불고필재하작용시고14.8%；재하적작용재일정적정도상증대료추기정영향반경적복사범위。인차,상복재하인기적침강변형대랄급전매기체적수집량영향현저,재설계전매기체수집공제계통시응고필해인소。
The influence of deformation settlement of landfill resulting from overlying loan and garbage degradation on the migration characteristics of landfill gas is analyzed in this study. The theories of porous medium gas-solid coupling and biodegradation were applied to construct an H-M coupling model of landfill gas migration so as to analyze the influence of the presence of loading on the storage and migration of landfill gas by the numerical simulation method. The results show that the pressure value of bottom gas with overlying load is clearly higher than the ones of top gas, and the change of gas pressure differences between the bottom and the top with overlying load is clearer than that of no load. With increasing landfill time, the gas pressure of landfill gradually reduces. The gas pressure of landfill with overlying load is higher than that of landfill with no load, and the difference of gas pressure between them is 0.045 kPa after the closure of landfill for one year,and 0.346 kPa after the closure of landfill for ten years. Collection amount of gas well with overlying load is higher 14.8% than that of with no load. The overlying load increases the radiation range of influence radius of the extraction well at some degree. The deformation settlement of landfill caused by overlying load can significantly influence the collection amount of landfill gas. This factor should be considered in the design of the control system of landfill gas collection.
