Overburden landslide is a common natural disaster worldwide. Many scholars study the stability of the overburden layer based on a linear, fold-line, or circular bedrock surface. They rarely systematically analyze the influence of irregular bedrock surfaces on instability characteristics of the overburden layer, because quantitatively characterizing an irregular bedrock surface is still problematic. This paper proposes a new method of random reconstruction of a bedrock surface based on the inverse discrete Fourier transform. And combined with the material point method (MPM), the whole process of slope instability is simulated and analyzed. Then the influence of the irregular bedrock surfaces on the instability characteristics of overburden landslides is studied quantitatively. The results indicate that the bedrock surface has a significant influence on instability characteristics of overburden landslide. The effect of bedrock surfaces represented by Fourier descriptor D₁ shows duality, and that controlled by D₂ can promote the stability of the overburden layer, and that reconstructed by D₃ shows diversity. Furthermore, the influence laws of irregular bedrock surfaces on the instability characteristics of overburden landslides are proposed.

覆土滑坡是世界范围内常见的自然灾害。许多学者基于线性、折线或圆形基岩表面研究覆盖层的稳定性。他们很少系统地分析不规则基岩表面对覆盖层失稳特征的影响，因为定量表征不规则基岩表面仍然存在问题。本文提出了一种基于逆离散傅立叶变换的基岩表面随机重建新方法。并结合材料点法(MPM)对边坡失稳的全过程进行了模拟分析。然后定量研究了不规则基岩面对上覆滑坡失稳特性的影响。结果表明，基岩面对上覆滑坡失稳特征有显着影响。用傅里叶描述符表示的基岩表面的影响D ₁表现出二元性，D ₂控制的能促进上覆层的稳定性，D ₃重构的表现出多样性。此外，提出了不规则基岩面对上覆滑坡失稳特性的影响规律。