Excessive gas pressure (GP) in landfills is a potential triggering mechanism for slope failure, which is rarely considered in analytical models. This paper presents a modified analytical model for landfill stability dependent on GP. A two-layered GP model is established to describe the GP above and below the leachate level. The distribution of GP is then used to calculate the factor of safety (FS) using a modified wedge stability analysis method. It is found that the lack of consideration of the GP in landfill stability analysis leads to serious overestimation of the FS. In addition, the GP gas pressure within the landfill accelerates the critical interface of a multilayer liner system shifting from one to another. A new estimation criterion for FS is proposed. The proposed criterion can directly estimate the stability of the landfill by the field-tested pore pressure. Finally, the proposed method is applied to estimate the slope failure of Xiaping landfill in Shenzhen, and the results verify the proposed method.

中文翻译：

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一种改进的依赖气体压力的垃圾填埋场稳定性分析方法

垃圾填埋场中过高的气压 (GP) 是斜坡破坏的潜在触发机制，在分析模型中很少考虑。本文提出了一种改进的基于 GP 的垃圾填埋场稳定性分析模型。建立了两层GP模型来描述渗滤液液位上下的GP。然后使用改进的楔稳定性分析方法将 GP 的分布用于计算安全系数 (FS)。发现垃圾填埋场稳定性分析中对GP的缺乏考虑导致了FS的严重高估。此外，垃圾填埋场内的 GP 气压加速了多层衬垫系统的临界界面从一个转移到另一个。提出了一种新的 FS 估计标准。所提出的准则可以通过现场测试的孔隙压力直接估计垃圾填埋场的稳定性。最后，将所提方法应用于深圳下坪垃圾填埋场边坡失稳估算，结果验证了所提方法。