Parametric study was performed on the seismic stability of pile-anchor slope reinforcement structures for earth retaining wall with different structural parameters. Dynamic finite element analysis and the Newmark permanent displacement method were combined to derive the dynamic time-history response of the pile-anchor structure and evaluate slope seismic stability. The effects of pile embedment, pile thickness, anchor position on the pile, anchor free length, anchor direction and anchor prestress were investigated by batch calculation under different structural conditions, and optimized design suggestions are proposed based on the numerical study. The quantitative analysis indicates that Newmark permanent displacement can effectively evaluate slope stability under seismic loading and provide an accessible approach to improve the performance-based design of pile-anchor structures. For the generalized vertical soil slope prevalent in actual slope engineering, considering the maximum factor of safety and minimum permanent displacement, it was found that the most optimized embedded depth occupies approximately 30% of the whole pile length in the soil slope, and the pile thickness is set as 1.5–2 m for superior shear and bending strength. In addition, there is a critical anchor position 3 m beneath the pile top, a threshold free length of the anchor cable of 9.5 m, as well as an optimal direction within the range of 15°–20°. Furthermore, the pile-anchor structure shows better sliding resistance with rational anchor prestress accounting for 20% of the sliding force. The slope seismic stability evaluation based on dynamic finite element analysis with different pile-anchor structural parameter conditions performed in this paper may lay a foundation for the design optimization of pile-anchor reinforcement structures for better dynamic performance.

对不同结构参数的挡土墙桩锚边坡加固结构的地震稳定性进行了参数研究。结合动力有限元分析和纽马克永久位移法，推导了桩锚结构的动力时程响应，评价了边坡的地震稳定性。通过在不同结构条件下的分批计算，研究了桩的埋深，桩厚，锚位置对桩，锚自由长度，锚方向和锚预应力的影响，并在数值研究的基础上提出了优化的设计建议。定量分析表明，纽马克永久位移可以有效地评估地震荷载作用下的边坡稳定性，并为改善基于性能的桩锚结构设计提供了一种可访问的方法。对于实际边坡工程中普遍存在的广义垂直土坡，考虑到最大安全系数和最小永久位移，发现最优化的埋深大约占土坡中整个桩长的30％，且桩厚设置为1.5–2 m可获得卓越的剪切和弯曲强度。此外，在桩顶下方3 m处有一个关键的锚固位置，锚固电缆的阈值自由长度为9.5 m，最佳方向在15°–20°范围内。此外，桩锚结构表现出较好的滑动阻力，合理的锚固预应力占滑动力的20％。本文基于动力有限元分析的不同桩锚结构参数条件下的边坡地震稳定性评价，为桩锚加固结构的优化设计提供了较好的动力性能。