摘要
为研究垃圾土的气体渗透特性,自主研制了垃圾土气体渗透特性试验装置,开展了人工配制垃圾土试样的室内试验,分析了气体压缩性、进气端压力、压缩位移等因素对气体渗透特性的影响。试验研究结果表明:考虑气体压缩性测得的气体渗透率比不考虑气体压缩性的数值略大;垃圾土中气体渗透不存在启动压力平方差梯度和临界流速;建议在开展垃圾土室内气体渗透性试验时进气端压力取值为3 kPa;随着压缩位移的增大,垃圾土试样的孔隙度和气体渗透率都不断减小,试样气体渗透率的范围为10^-13 m^2~10^-12 m^2,孔隙度在0.3~0.57。研究成果丰富了垃圾土气体渗透特性研究的试验设备,可为后续开展填埋气体迁移规律和收集利用方面的研究提供支撑。
In order to study the gas permeation properties of municipal solid waste(MSW),the indoor gas permeability test of artificial mixed MSW was carried out by the independently developed test apparatus.The influence of the gas compressibility,inlet pressure and compressed displacement on the gas permeation properties was investigated.Test results show that the gas permeability measured by considering gas compressibility is slightly larger than that without considering gas compressibility.There is no threshold pressure gradient and critical velocity when gas permeates municipal solid waste.It is suggested that the inlet pressure is 3kPa when the gas permeability indoor test is carried out.With the increase of compressive displacement,both the porosity and gas permeability of MSW samples decreased.The gas permeability ranges from 10^-13 m^2 to 10^-12 m^2,and the porosity ranges from 0.3 to 0.57.These results have enriched the experimental equipment for the study of landfill gas permeability characteristics and provided support for the subsequent research on landfill gas migration and collection.
作者
曾刚
李业学
王婧
马骏
刘磊
田宇
ZENG Gang;LI Ye-xue;WANG Jing;MA Jun;LIU Lei;TIAN Yu(School of Civil Engineering and Architecture,Hubei University of Arts and Science,Xiangyang 441053,China;State Key Laboratory of Geomechanicsand Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;Wuhan Environment Investment&Development Co.,Ltd,Wuhan 430015,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2019年第5期1317-1324,共8页
Journal of Guangxi University（Natural Science Edition）
基金
湖北省自然科学基金资助项目(2017CFB203)
湖北省教育厅科学技术研究项目(Q20172604)
湖北文理学院教师科研能力培育基金资助项目(2017KYPY007)
关键词
垃圾土
气体渗透率
孔隙度
进气端压力
压缩
municipal solid waste
gas permeability
porosity
inlet pressure
compression
