Department of Civil and Environmental Engineering, Dongguk University, Seoul, Republic of Korea.
Waste Manag Res. 2022 Mar;40(3):314-322. doi: 10.1177/0734242X21994750. Epub 2021 Mar 2.
In this study, characteristics of the long-term landfill settlement are analysed and the starting date of residual settlement is deduced using the data of the landfill 1 of the Gimpo Metropolitan Landfill (GML) measured for 27 years. The landfill 1 is a multi-staged municipal solid waste landfill where dykes are constructed after landfilling for subsequent waste fills. The landfilling began in 1992 and finished in 2000, and the waste settlement measurement continued throughout this period. The older waste of the lower lift shows higher biodegradation and larger settlement than the waste of the upper lift, which acts as vertical load. Large settlement occurred in the lower lifts due to the collapse of waste voids caused by the overburden load of the upper lifts after biodegradation of waste in the lower lifts during long-term landfilling. In the conventional landfills, that is, mono-layer landfills, the time-dependent settlement generally occurs after the stress-dependent settlement. But, most of the time, this landfill showed mainly the time-dependent settlement. The duration, at which the biodegradation of organic matters is reduced and the residual settlement begins, was 8.8 years in average and the date range was from 7.6 to 11.7 years considering each disposed block in landfill 1. This date is obtained by calculating from the mid-point time of the landfilling duration.
在这项研究中，分析了长期垃圾填埋场沉降的特征，并利用金浦市垃圾填埋场 1 （GML）测量的 27 年数据推断出剩余沉降的起始日期。GML1 是一个多阶段的城市固体废物填埋场，在进行后续废物填埋之前会建造堤坝。GML1 的填埋作业始于 1992 年，于 2000 年结束，废物沉降测量在整个期间持续进行。较低层的旧废物比作为垂直荷载的上层废物表现出更高的生物降解和更大的沉降。由于长期填埋过程中下层废物的生物降解导致上层废物的覆盖荷载引起的废物空隙坍塌，导致较低层发生了大量沉降。在传统的垃圾填埋场，即单层垃圾填埋场中，通常在应力相关沉降之后才会发生与时间相关的沉降。但是，在大多数情况下，这个垃圾填埋场主要表现出与时间相关的沉降。考虑到填埋场 1 中的每个处理块，有机物质生物降解减少和剩余沉降开始的时间平均为 8.8 年，范围为 7.6 到 11.7 年。这个日期是通过从填埋作业持续时间的中点时间计算得出的。
