Study on Dynamic Response Law of 2×2 Vertical and Batter Pile Groups under Elevated Pile Cap in Saturated Sand

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Study on Dynamic Response Law of 2×2 Vertical and Batter Pile Groups under Elevated Pile Cap in Saturated Sand

更新时间：2025-09-25

- Study on Dynamic Response Law of 2×2 Vertical and Batter Pile Groups under Elevated Pile Cap in Saturated Sand
- Issue 2, Pages: 204-213(2020)
- 作者机构：
  
  河北工业大学土木与交通学院,天津,300401
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU435
- Published：2020
- 稿件说明：
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张健,李雨润,闫志晓,戎贤.饱和砂土场地2×2高承台直斜群桩动力响应规律研究∗[J].防灾减灾工程学报,2020,(2):204-213

ZHANG Jian. Study on Dynamic Response Law of 2×2 Vertical and Batter Pile Groups under Elevated Pile Cap in Saturated Sand[J]. 2020, (2): 204-213.
张健,李雨润,闫志晓,戎贤.饱和砂土场地2×2高承台直斜群桩动力响应规律研究∗[J].防灾减灾工程学报,2020,(2):204-213 DOI：

ZHANG Jian. Study on Dynamic Response Law of 2×2 Vertical and Batter Pile Groups under Elevated Pile Cap in Saturated Sand[J]. 2020, (2): 204-213. DOI：

摘要

为研究饱和砂土场地地震液化情况下直斜群桩水平动力响应规律，使用浙江大学ZJU400土工离心试验设备进行了饱和砂土场地2×2高承台直斜群桩的离心机振动台模型试验，通过两组试验分别对于不同土层处的加速度时程以及孔压比进行分析。同时，结合饱和砂土的液化情况，分别针对2×2高承台直斜群桩在振动过程中承台水平动力响应以及桩身弯矩峰值的变化进行了对比分析。试验结果表明：随着振动强度的增大，饱和砂土层液化深度逐渐增加，尤其在近桩位置土层孔压比变化更为明显；直群桩承台水平加速度峰值在一定范围内出现了放大的现象，而斜群桩承台则基本未发生此显现；随振动强度的增加桩身弯矩峰值分布发生较大变化，其变化情况与饱和砂土液化有着较为密切的关系，在0.05g和0.1g工况下斜群桩桩身弯矩峰值明显小于直群桩，而0.3g工况时斜群桩桩身弯矩峰值出现了显著增加的现象并超过了同工况下直群桩情况。

Abstract

In order to study the horizontal dynamic response law of vertical and batter pile groups under the condition of seismic liquefaction in saturated sand

the centrifuge shaking table tests on 2×2 vertical and batter pile groups under elevated pile cap in saturated sand were carried out by using ZJU400 geotechnical centrifugal test equipment of Zhejiang University. Two sets of experiments were used to analyze the acceleration time history and pore pressure ratio in different soil layers. At the same time

combined with the liquefaction situation of saturated sand

the horizontal dynamic response of the pile cap and the change of the bending moment of the pile body were compared and analyzed for the 2×2 vertical and batter pile groups under elevated pile cap. The results show that: with the increase of vibration intensity

the liquefaction depth of saturated sand increases gradually

especially in the near-pile region

the change of pore pressure ratio is more obvious; the horizontal acceleration peak of the vertical pile group cap amplifies within a certain range

while that phenomenon does not occur for the batter pile group cap; With the increase of vibration intensity

the peak distribution of the bending moment of the pile body changes greatly. The change has a close relationship with the liquefaction of saturated sand. Under the conditions with peak accelerations of 0.05g and 0.1g

the peak bending moment of the batter pile group is obviously smaller than that of the vertical pile group

and the peak bending moment of the batter pile group shows a significant increase under the condition with peak acceleration of 0.3g and exceeds that of the vertical pile group with the same working condition.

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references

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