Research on Water Retention Characteristics and Pore Size Distribution of Landfilled Municipal Solid Waste
Soil-water characteristic curve(SWCC)is used to describe the relation between water content and matric suction in porous media,and reflects to some extent the pore size distribution.However,a complete SWCC of municipal solid waste(MSW)is difficult to achieve by direct measurement because of the existence of macropores.For this reason,SWCCs of the matrix region in MSW were measured by a pressure plate extractor,and SWCCs of the macropore region were determined from water breakthrough tests in this paper.Water retention characteristics and pore size distribution of MSW were analyzed based on the complete SWCC.The results show that the residual water contents of municipal solid waste were high.Field capacity of shallow,middle and deep waste were 38.5%,42.2%and 46.8%,respectively,corresponding to a matric suction range of 3–8 kPa.As the depth and age increase,the effective water content interval and specific yield decrease.Taking 1-kPa matric suction as a limit,pores in MSW can be divided into macropores and micropores.The probability density function of pore radius is bimodal.As the depth increase,the amount of macropores and their radius decrease,and the amount of micropores increases with the average pore size becomes smaller.
Landfilled municipal solid waste Water retention characteristics Dual-porosity Macropore Soil-water characteristic curve
Wenjie Zhang Lu Lv
Department of Civil Engineering,Shanghai University,Shanghai 200444,China
国际会议
The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)
杭州
英文
210-216
2018-10-28（万方平台首次上网日期，不代表论文的发表时间）