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.

城市固体废物（MSW）填埋场的坡度破坏是一种常见的环境灾害，会带来严重的生态和健康风险。垃圾填埋场边坡稳定性 (SS) 对有机材料降解引起的渗滤液水平和气体压力 (GP) 很敏感，但这些综合影响的程度仍然知之甚少。本研究提出了一种简化的垃圾填埋场 GP 计算方法，并建立了考虑渗滤液和 GP 联合影响的圆形滑动法。结果表明，垃圾填埋场的GP主要受产气率、固体废物（SW）的气体传导率和填埋深度的影响。当考虑 GP 时，垃圾填埋场 SS 的安全系数也显着降低。GP 的分布受失效圈深度和 SW 的影响。垃圾填埋场边坡不稳定性可以通过填充的 SW 的 GP 突破引起的局部破坏来解释。本研究可能为 MSW 填埋场的设计、运营和管理提供重要指导。