Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, Jiangsu, People's Republic of China.
Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing, Jiangsu, People's Republic of China.
Waste Manag Res. 2022 Mar;40(3):323-330. doi: 10.1177/0734242X211001414. Epub 2021 Mar 24.
Slope failure in municipal solid waste (MSW) landfills is a common environmental disaster that poses serious ecological and health risks. Landfill slope stability (SS) is sensitive to leachate levels and gas pressure (GP) caused by the degradation of organic material, but the extent of these combined effects remains poorly understood. In this study, a simplified landfill GP calculation method is presented and a circular slide method that considers the combined effects of leachate and GP is established. The results show that the landfill GP is mainly affected by the gas production rate, gas conductivity of the solid waste (SW), and landfill depth. The safety factor of landfill SS is also significantly lower when GP is considered. The distribution of GP is affected by the depth of the failure circle and SW. Landfill slope instability can be explained by localized damage caused by GP breakthrough of the filled SW. This study probably provides important guidance for the design, operation, and management of MSW landfills.
垃圾填埋场边坡失稳是一种常见的环境灾害，会对生态和健康造成严重的风险。垃圾填埋场边坡稳定性（SS）对有机物质降解产生的渗滤液水平和气体压力（GP）敏感，但这些综合效应的程度仍了解甚少。本研究提出了一种简化的填埋场 GP 计算方法，并建立了考虑渗滤液和 GP 综合效应的圆形滑动法。结果表明，填埋场 GP 主要受气体产生速率、固体废弃物（SW）的气体传导率和填埋场深度的影响。考虑 GP 后，填埋场 SS 的安全系数也显著降低。GP 的分布受破坏圆深度和 SW 的影响。GP 的突破会导致填埋场 SW 局部损坏，从而导致填埋场边坡失稳。本研究可能为城市固体废物填埋场的设计、运行和管理提供重要指导。
