城市固体废弃物持水特性的室内试验

为了对城市固体废弃物的持水特性进行分析,采用非饱和固结仪对6组人工配制的城市固体废弃物试样进行了土水特征曲线测定的室内试验,同时还采用滤纸法量测试样的土水特征曲线,并对试样孔隙大小分布指标λ进行了分析。试验结果表明:试样的进气值很低,为1kPa左右,荷载作用使进气值升高;λ值随着试样初始孔隙比的增加而减小,随着试样有机物质量分数的增加而增加;使用滤纸法测城市固体废弃物的土水特征曲线时,高吸力阶段的值更加合理,更有参考性。

Laboratory tests on hydraulic properties of municipal solid waste

In order to analyze the hydraulic properties of municipal solid waste (MSW),laboratory tests on the soil-water characteristic curves of 6 groups of MSW samples with different void ratios and organic contents are performed by means of the unsaturated consolidation apparatus.The filter paper method is also employed to determine their soil-water characteristic curves.The distribution index λ of void size of the samples is analyzed.The results show that the air-entry value of the MSW samples is very small and about 1 kPa,and it increases owing to the action of loading.The value of λ decreases with the increase of the initial void ratio and increases with the increase of the organic content in the samples.For measuring the soil-water characteristic curves of MSW by means of the filter paper method,the values at high suction phase are more rational and significant.