The objective of this study was to investigate how addition of high-moisture waste (HMW) affects the hydraulic and mechanical behavior of municipal solid waste (MSW). Direct shear and hydraulic conductivity tests were conducted on MSW, HMW, and MSW-HMW mixtures prepared with HMW contents ranging from 20% to 80% (by total mass). Direct shear tests were conducted at normal stress between 22 and 168 kPa and hydraulic conductivity tests were conducted at vertical effective stresses of approximately 50, 100, and 200 kPa. A threshold HMW content of 40% was identified corresponding to substantial change in friction angle and hydraulic conductivity of the mixtures. Municipal solid waste and MSW-HMW mixtures with less than 40% HMW had friction angles between 29° and 32° and hydraulic conductivities greater than or equal to 1.3 × 10⁻⁶ m/s. At HMW contents above 40%, the friction angle and hydraulic conductivity decreased with increasing HMW content. At 80% HMW, the hydraulic and mechanical behavior of the MSW-HMW mixture was comparable to HMW. The HMW had a friction angle of approximately 2° and hydraulic conductivity of 1.1 × 10⁻¹¹ m/s at a vertical effective stress of 50 kPa. Additional direct shear tests conducted on MSW and MSW-HMW mixtures soaked in water to simulate subsequent wetting post disposal revealed a decrease in friction angle from approximately 29° to 24° for MSW mixed with 40% HMW.

这项研究的目的是调查高水分废物（HMW）的添加如何影响城市固体废物（MSW）的水力和机械性能。在MSW，HMW和MSW-HMW混合物中进行的直接剪切和水力传导率测试均采用HMW含量为20％至80％（按总质量计）的方法制备。在22至168 kPa的正应力下进行直接剪切测试，在大约50、100和200 kPa的垂直有效应力下进行水力传导率测试。与混合物的摩擦角和水力传导率的实质变化相对应，确定的阈值HMW含量为40％。HMW低于40％的城市固体废物和MSW-HMW混合物的摩擦角在29°至32°之间，水力传导率大于或等于1.3×10^-6 m / s。当HMW含量超过40％时，摩擦角和水力传导率随HMW含量的增加而降低。HMW为80％时，MSW-HMW混合物的水力和机械性能与HMW相当。在50 kPa的垂直有效应力下，HMW的摩擦角约为2°，水力传导率为1.1×10 ^-11 m / s。对浸泡在水中的MSW和MSW-HMW混合物进行的其他直接剪切试验，以模拟随后的润湿后处置，发现与40％HMW混合的MSW的摩擦角从大约29°降低到24°。