Roles of ageing on the physical, chemical and mechanical parameters of a prototype municipal solid waste

Abdorrahman Kaboudani, Mohsen Ajdari, Shahrzad Maleki, Zahra Esfandiari, Ali Shafiee
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Abstract

ABSTRACTThis study is mainly aimed at exploring effects of the aging-induced chemical decomposition of Municipal Solid Waste (MSW) on the shear response and physical properties of locally available MSW of Fars province, Iran, at its in-situ condition. To this end, a large direct shear device (1×1×1.1 m3) is designed, fabricated and employed to evaluate the parameters of the failure envelop at plane strain condition representing slopes of engineered landfills. Bulk disturbed samples of fresh MSW are exhumed from an operational disposal site to be implemented into the study and subsequently remolded in the large-scale shear box. Four drained shear tests are performed under a variety of vertical stresses. Next, intact components of MSW are landfilled over a period of 3, 6, and 9 months. Similar shear experiments are conducted at the end of each mentioned time interval. Mechanical behavior of MSW is completely frictional and internal friction angle of the studied MSW non-linearly increases with time from 44.2º to 55.7º. The stress-strain response is almost bilinear over a wide range of displacement. The decomposition process is further clarified in light of results of pH tests conducted on the leachate of the MSW at the end of various landfilling time intervals.KEYWORD: Municipal solid wastelarge direct shear deviceageingshear strength Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementAll data, models, and code generated or used during the study appear in the submitted article.
老化对城市固体废物原型的物理、化学和机械参数的影响
摘要本研究旨在探讨城市生活垃圾(MSW)老化化学分解对伊朗法尔斯省当地有效城市生活垃圾原位状态下的剪切响应和物理性质的影响。为此,设计、制作了一台大型直剪装置(1×1×1.1 m3),对代表工程填埋场边坡的平面应变条件下的破坏包络参数进行了评估。新鲜都市固体废物的大量扰动样本从一个运作的处置地点挖掘出来,随后在大型剪切箱中进行重塑。在不同的竖向应力下进行了4次排水剪切试验。接下来,在3个月、6个月和9个月的时间里,城市固体废物的完整成分被填埋。在每个时间间隔结束时进行类似的剪切试验。垃圾的力学行为完全为摩擦行为,内摩擦角随时间呈非线性增加,从44.2º增加到55.7º。在较宽的位移范围内,应力应变响应几乎是双线性的。根据在不同堆填时间间隔结束时对都市固体废物的渗滤液进行的pH值测试结果,进一步阐明了分解过程。关键词:城市固体废弃物大型直剪装置抗剪强度披露声明作者未报告潜在利益冲突。数据可用性声明在研究过程中生成或使用的所有数据、模型和代码都出现在提交的文章中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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