School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, China.
Waste Manag Res. 2020 Dec;38(12):1389-1404. doi: 10.1177/0734242X20953486. Epub 2020 Oct 2.
This study summarized global examples of landfill slope instability over the past 40 years, then selected 62 cases from 22 different counties to analyse the primary factors causing landfill instability. Three slope instability modes in landfill were categorized according to the position of the slip surface: (1) slip surfaces generated inside the waste pile; (2) slip surfaces that pass through the foundation soil; and (3) slip surfaces that occur along the interface between the bottom liner and the municipal solid waste (MSW) pile. These three types of slope instability modes account for 69.4%, 19.32% and 11.28% of all slope instability, respectively. Moreover, five primary causes of landfill instability were identified. A high landfill leachate level was the dominant cause, accounting for 40.32% of cases. This was followed by inadequate compaction of MSW, which accounted for 22.58% of cases, and insufficiently bearing capacity of the foundation, which accounted for 19.35% of cases. Moreover, low shear strength of the liner-MSW interface and rapid release or deflagration of landfill gas were critical factors affecting landfill stability. Factors of safety were calculated using GeoStudio software for selected landfills in China (Maoershan and Xiaping) and Sri Lanka (Meethotamulla). Results from this study are expected to contribute to the prevention and control of landfill failure.
本研究总结了过去 40 年全球范围内的垃圾填埋场边坡失稳实例，然后从 22 个不同国家/地区中选取了 62 个案例，分析了导致填埋场不稳定的主要因素。根据滑动面的位置，将三种填埋场边坡失稳模式进行了分类：（1）滑动面发生在废物堆内部；（2）滑动面穿过基础土；（3）滑动面发生在底部衬垫和城市固体废物（MSW）堆之间的界面上。这三种边坡失稳模式分别占所有边坡失稳的 69.4%、19.32%和 11.28%。此外，还确定了导致垃圾填埋场不稳定的五个主要原因。高垃圾渗滤液水位是主要原因，占案例的 40.32%。其次是 MSW 压实不足，占 22.58%，基础承载力不足，占 19.35%。此外，衬垫与 MSW 界面的低抗剪强度和垃圾填埋气的快速释放或爆炸也是影响填埋场稳定性的关键因素。使用 GeoStudio 软件对中国（帽儿山和西安平）和斯里兰卡（梅托塔穆拉）的选定垃圾填埋场进行了安全系数计算。本研究的结果有望为防止和控制垃圾填埋场的失败做出贡献。
