The reinforcement effect of stabilizing piles is significant for ensuring the stability of major landslide mitigation projects. To investigate the work performance of piles under different boundary conditions, we introduce two physical modelings of a pile-reinforced landslide with the same pile parameters and soil conditions but different load conditions and analyze the consequent differences in the responses of the soil and piles and their interactions in these two physical modelings. Results show that piles in the same landslide/pile systems may have different reinforcement effects; this phenomenon has been explained by quantitatively describing the role of piles and analyzing the processes of soil–pile interactions in the physical modelings. Further, the dynamic responses between the excess pore pressure and the soil–pile interaction are investigated and the excess pore pressure-dependent mechanisms of soil–pile interactions are revealed. The generation of excess pore pressure and its accumulation around piles leads internally to a mechanism in which the arching effect is weakened and externally to a phenomenon in which the progressive failure of pile-reinforced landslides is accelerated. Eventually, we calculate the effective stress in the soil around piles, and the results reveal that a sharp reduction in effective stress in the soil around piles causes failure of the pile reinforcement. In addition, for a pile-reinforced landslide with a strong soil–pile interaction, an imbalance of soil arch footholds is the main failure macro-mechanism. Based on the analysis results, we present some feasible suggestions for the installation of rowed pile and their monitoring to ensure the long-term stability of a pile-reinforced landslide.

稳定桩的加固作用对于保证重大滑坡减缓工程的稳定性具有重要意义。为了研究不同边界条件下桩的工作性能，我们引入了桩参数和土壤条件相同但荷载条件不同的桩加筋滑坡的两种物理模型，并分析了由此产生的土壤和桩响应的差异以及它们的响应。这两个物理模型中的相互作用。结果表明，同一滑坡/桩系统中的桩可能具有不同的加固效果；这种现象可以通过定量描述桩的作用和分析物理模型中土-桩相互作用的过程来解释。更远，研究了超孔隙压力和土桩相互作用之间的动态响应，揭示了土桩相互作用的超孔隙压力依赖机制。超孔隙压力的产生及其在桩周围的积累导致拱效应减弱的机制和外部加速桩加固滑坡逐渐破坏的现象。最后，我们计算了桩周土中的有效应力，结果表明桩周土中有效应力的急剧下降会导致桩身加固失效。此外，对于土桩相互作用强的桩基滑坡，土拱落脚不平衡是主要的破坏宏观机制。根据分析结果，