School of Engineering and Information Technology, University of New South Wales, Canberra, Northcott Drive, Campbell, ACT 2612, Australia.
School of Engineering and Information Technology, University of New South Wales, Canberra, Northcott Drive, Campbell, ACT 2612, Australia.
Waste Manag. 2022 Jul 15;149:207-217. doi: 10.1016/j.wasman.2022.06.020. Epub 2022 Jun 22.
This paper investigates the geotechnical properties of a type of synthetic municipal solid waste (MSW). The tests were conducted on five groups of synthetic MSW compositions, based on the field characterization of fresh MSW samples collected from Mugga Lane landfill site, ACT, Australia. Compaction, hydraulic conductivity, compression, drained and undrained shear properties of the MSWs with water and leachate addition to the field moisture content were studied. The study shows that adding leachate could increase the maximum dry density of the MSWs under given moisture contents and compaction energies. The hydraulic conductivity of the MSWs could decrease by 100-fold when the confining pressure increases from 15 kPa to 240 kPa. The shear behaviours of the MSW samples follow the strain hardening behaviours of loose sand. The cohesion of the MSWs decreases but the friction angle of the MSWs increases with leachate addition due to the change in the surface tension and viscosity of the pore liquids and the loss of cementitious components. The addition of leachate increases the compression ratios of the MSWs by around 10% to 30% due to the change in the pH of the pore liquids. The most significant components affecting the shear and compression behaviours of the MSW were paper and wood. The effects of leachate exposure on the geotechnical properties of the MSWs is not very significant. It is important to consider the variation of MSW properties to the leachate properties (viscosity, pH and surface tension) in the large body of MSWs in the landfills.
本文研究了一种合成城市固体废物（MSW）的岩土特性。测试是基于从澳大利亚堪培拉穆加巷垃圾填埋场采集的新鲜 MSW 样品的野外特征，对五组合成 MSW 组成进行了研究。研究了在向原状土样中添加水和浸出液以达到现场含水量的情况下，MSW 的压实性、水力传导性、压缩性、排水和不排水剪切特性。研究表明，在给定的含水量和压实能条件下，添加浸出液可以增加 MSW 的最大干密度。当围压从 15 kPa 增加到 240 kPa 时，MSW 的水力传导系数可降低 100 倍。MSW 样品的剪切行为遵循松散砂的应变硬化行为。由于孔隙液的表面张力和粘度的变化以及胶凝成分的损失，MSW 的内聚力降低，但内摩擦角增加。由于孔隙液 pH 值的变化，浸出液的添加会使 MSW 的压缩比增加约 10%至 30%。对 MSW 剪切和压缩特性影响最大的成分是纸张和木材。浸出液暴露对 MSW 岩土特性的影响并不显著。在填埋场中的大量 MSW 中，考虑 MSW 特性随浸出液特性（粘度、pH 值和表面张力）的变化非常重要。
