基于P波斜入射海相软土区螺旋桩动力响应分析

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (15) : 294-301.

论文

宗钟凌1，岑航1，黄德龙1，刘强2，汤爱平2，庄潇轩1

作者信息 +

Dynamic response analysis of helical piles in marine soft soil areas based on P-wave oblique incidence

ZONG Zhongling1, CEN Hang1, HUANG Delong1, LIU Qiang2, TANG Aiping2, ZHUANG Xiaoxuan1

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文章历史 +

摘要

在地震频发地区，越来越多建筑使用螺旋桩作为基础，此桩型具有良好的抗震能力。通过建立三维有限元模型，基于黏弹性人工边界，把地震作用等效为边界结点上的作用力。本研究考虑动静边界转换的影响，最后建立了具有黏弹性边界的螺旋桩-土体三维模型。探讨了处于海相软土场地下，不同种类地震波、地震强度、入射角度和螺旋叶片个数对螺旋桩轴力、弯矩和动力p-y曲线的影响。结果表明，相比较于弯矩，入射角度对轴力和动力p-y曲线的影响较大。除此之外，地震强度对弯矩的影响较大，而地震波频率和螺旋叶片个数对其的影响较小。不同PGA（0.05g，0.1g，0.3g）时，随着入射角度的改变，螺旋桩受到最大和最小弯矩的差值从144.1 N•m增加到了891 N•m。通过该研究结论，不仅可以得出软土场地下螺旋桩-土体的相互作用关系，也能为螺旋桩抗震设计提供依据。

Abstract

In earthquake-prone areas, more and more buildings use helical piles as foundations, and this pile type has good seismic capacity. By establishing a three-dimensional finite element model based on a viscoelastic artificial boundary, the seismic action is equated to the force on the boundary nodes. In this study, the effect of dynamic and static boundary transformations is considered, and finally a three-dimensional model of helical pile-soil with viscoelastic boundary is established. The effects of different types of seismic waves, seismic intensity, incident angle and number of helical blades on the axial force, bending moment and dynamic p-y curves of helical piles are investigated for a marine-phase soft soil site. The results show that the effect of incident angle on axial force and dynamic p-y curve is larger compared to bending moment. In addition to this, the seismic intensity has a greater effect on the bending moment, while the seismic wave frequency and the number of helical blades have a smaller effect on it. When loading different PGA (0.05g, 0.1g, 0.3g), as the incident angle changes, the difference between the maximum and minimum bending moments of the spiral pile increases from 144.1 N•m to 891 N•m. The conclusions of this study can not only derive the interaction relationship between the helical pile-soil under the soft soil site, but also provide a basis for the seismic design of helical piles.

导出引用

宗钟凌1，岑航1，黄德龙1，刘强2，汤爱平2，庄潇轩1. 基于P波斜入射海相软土区螺旋桩动力响应分析[J]. 振动与冲击, 2024, 43(15): 294-301

ZONG Zhongling1, CEN Hang1, HUANG Delong1, LIU Qiang2, TANG Aiping2, ZHUANG Xiaoxuan1. Dynamic response analysis of helical piles in marine soft soil areas based on P-wave oblique incidence[J]. Journal of Vibration and Shock, 2024, 43(15): 294-301

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