地震作用下碎石土滑坡抗滑桩的变形破坏机理

Mechanism of Deformation Failure of Anti-slide Piles in Debris Landslide under Earthquake Action

为了揭示碎石土滑坡在地震荷载作用下的变形破坏模式和作用规律,采用相似材料模型试验方法,进行了以南温碎石土滑坡为原型的物理模型试验。分析了在地震荷载作用下抗滑桩不同的锚固深度下,桩位移和边坡变形情况。利用弹塑性动力固结大变形有限元模型,采用非线性分析方法,进行了一系列对比分析研究。进一步验证了碎石土滑坡的变形破坏机理。分析了不同的锚固深度下,桩顶的动位移和变形响应。通过室内物理模型试验和数值模拟分析,提出南温滑坡抗滑桩的锚固深度设置,宜为桩长的0.29~0.31倍。其设计方法和研究思路,可为相关研究提供参考和借鉴。

Physical model test with similar materials for Nanwen debris landslide was conducted to reveal the de-formation failure mode of debris landslide under earthquake load. The displacement of anti-slide piles of different depths and the deformations of slope under earthquake load were analyzed. Furthermore, a non-linear finite element model of elastic-plastic dynamic consolidation of large strain was built to verify the deformation failure of debris landslide. The dynamic displacement of pile top and the deformation response of pile of varying depth were ana-lyzed. The embedded depth of anti-slide piles should be 0.29-0.31 times the pile length for Nanwen debris land-slide. The model design method and research idea could offer reference for related researches.