Aging effects on the mechanical property of waste mixtures in coastal landfill sites
Aging effects on the mechanical property of waste mixtures in coastal landfill sites
复制标题
老化对沿海垃圾填埋场废物混合物机械性能的影响
DOI：
10.1016/j.sandf.2015.10.009
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Nguyen;L.C.;Inui;T.;Ikeda;K.;and Katsumi;T.
沿海垃圾填埋场不仅提供了一种处置选择，而且在填埋完成后创造了一个新的土地空间。为了对垃圾填埋场的沉降、稳定性和/或承载能力进行适当的设计，必须研究废弃层的岩土性质，如变形和抗剪强度。本研究主要研究沿海垃圾填埋场垃圾混合体的力学性质，包括城市生活垃圾焚烧炉灰、矿渣、土壤等，以期为沿海垃圾填埋场关闭后利用的岩土性质提供有用的信息。为了了解老化对垃圾混合料力学性能的影响，对滨海垃圾填埋场模拟渗滤液中养护不同时间的再生垃圾样品进行了一系列三轴固结不排水压缩试验和渗透系数试验。结果表明，固化后峰值强度和变形模数增加，残余强度不受养护时间的影响。对养护后的废样进行了扫描电子显微镜观察和X射线衍射分析，证实钙矾石和水化产物的形成对显微结构有致密化作用。废样的峰值抗剪强度较高，导水率较低，主要归因于这一效应。
Coastal landfill sites not only offer an option for disposal but also create a new land space after the completion of landfilling. To perform proper design on settlement, stability, and/or bearing capacity at landfill sites, the geotechnical properties of the waste layer such as deformation and shear strength should be investigated. This research is focused on the mechanical properties of waste mixture sampled at a coastal landfill site including municipal solid waste incinerator ash, slag, soil and others, to provide useful information on geotechnical properties in utilizing coastal landfill sites after their closure. A series of triaxial consolidated undrained compression tests (CU) and hydraulic conductivity tests were carried out on the reconstituted waste samples before and after being cured in simulated leachate water in coastal landfill sites for different periods, to understand the aging effects on mechanical properties of waste mixture. It was shown that while curing results in an increase in the peak strength and deformation modulus, the residual strength was not affected by the curing periods. Scanning electron microscope observations and X-ray diffraction analysis on the waste samples after curing confirmed that the formation of ettringite and hydration products had a densification effect on the microstructure. The higher peak shear strength and lower hydraulic conductivity of the waste samples were attributed to this effect.