震陷土层变化下变截面单、群桩动力响应差异

doi:10.16183/j.cnki.jsjtu.2022.435

上海交通大学学报 ›› 2024, Vol. 58 ›› Issue (7): 1086-1096.doi: 10.16183/j.cnki.jsjtu.2022.435

震陷土层变化下变截面单、群桩动力响应差异

冯忠居¹, 王伟¹(), 张聪¹, 朱继新², 王逸然¹, 孟莹莹³

1.长安大学公路学院,西安 710064
2.厦门路桥工程投资发展有限公司,福建厦门 361000
3.河南交院工程技术集团有限公司,郑州 451460

收稿日期:2022-11-01 修回日期:2022-12-13 接受日期:2022-12-21 出版日期:2024-07-28 发布日期:2024-07-26
通讯作者: 王伟,硕士生;E-mail:2596552961@qq.com.
作者简介:冯忠居(1965-),教授,从事桥梁桩基础工程方面研究.
基金资助:
福建省交通科技项目(JXFZ2020-XM0189);国家自然科学基金青年科学基金(4190070568);中央高校基本科研业务费专项资金(300102218115)

Dynamic Response Difference of Single Pile and Pile Group with Variable Section in Variation of Seismic Subsidence Soil Layer

FENG Zhongju¹, WANG Wei¹(), ZHANG Cong¹, ZHU Jixin², WANG Yiran¹, MENG Yingying³

1. School of Highway, Chang’an University, Xi’an 710064, China
2. Xiamen Road and Bridge Engineering Investment Development Co., Ltd., Xiamen 361000, Fujian, China
3. Henan Jiaoyuan Engineering Technology Group Co., Ltd., Zhengzhou 451460, China

Received:2022-11-01 Revised:2022-12-13 Accepted:2022-12-21 Online:2024-07-28 Published:2024-07-26

摘要/Abstract

摘要：

为研究地震动作用下震陷土层厚度不同时大直径变截面单桩与群桩基础的动力响应差异,依托厦门第二东通道翔安大桥,通过振动台模型试验,开展震陷土层厚度30、40、50 cm时,单桩与群桩基础桩周土震陷量、桩顶水平位移、桩身加速度及弯矩动力响应差异研究.结果表明:随着震陷层厚度增大,单桩与群桩基础桩周土震陷量、桩顶水平位移、桩身加速度及弯矩均逐渐增大,且加速度及弯矩在变截面处突变;同一震陷层厚度下,群桩基础桩周土震陷量较单桩大,但群桩基础加速度、桩顶水平位移及桩身弯矩均小于单桩.震陷场地桩基础设计时,应着重考虑变截面单桩与群桩动力响应差异,保证桩基础抗震性能.

关键词: 桥梁工程, 大直径变截面桩, 震陷土层, 振动台试验, 动力响应差异

Abstract:

In order to study the difference of dynamic response between large diameter variable section single pile and pile group foundations in seismic subsidence soil with different thicknesses under ground motion, based on the Xiang’an Bridge of Xiamen Second East Channel, a shaking table model test was conducted to study the difference of dynamic response of soil subsidence, horizontal displacement of pile top, acceleration of pile body and bending moment between single pile and pile group foundation when the thickness of seismic subsidence soil layer is 30, 40, and 50 cm. The results show that with the increase of the thickness of seismic subsidence layer, the seismic subsidence, horizontal displacement of pile top, acceleration and bending moment of single pile and pile group foundations increase gradually, and the acceleration and bending moment change abruptly at variable section. In the seismic subsidence layer with the same thickness, the seismic subsidence of soil around pile group foundation is larger than that of single pile, but the acceleration of pile group foundation, horizontal displacement of pile top and bending moment of pile body are smaller than those of single pile. It is suggested that in the design of pile foundation in seismic subsidence site, the difference of dynamic response between variable section single pile and pile group should be mainly considered to ensure the seismic performance of pile foundation.

Key words: bridge engineering, large diameter variable section pile, seismic subsidence layer, shaking table test, dynamic response difference

中图分类号:

TU473

冯忠居, 王伟, 张聪, 朱继新, 王逸然, 孟莹莹. 震陷土层变化下变截面单、群桩动力响应差异[J]. 上海交通大学学报, 2024, 58(7): 1086-1096.

FENG Zhongju, WANG Wei, ZHANG Cong, ZHU Jixin, WANG Yiran, MENG Yingying. Dynamic Response Difference of Single Pile and Pile Group with Variable Section in Variation of Seismic Subsidence Soil Layer[J]. Journal of Shanghai Jiao Tong University, 2024, 58(7): 1086-1096.

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性能	参数
振动模式	正弦、随机(地震动)
频率范围	0.5~50 Hz
最大模型载重	30 t
最大加速度幅值	满载:XY向1.0g,Z向0.7g
最大速度幅值	XY向:50 cm/s,Z向:40 cm/s
最大位移幅值	XY向:±80 mm,Z向:±50 mm

物理量	量纲	相似常数
加速度,a	LT^-2	1
人工质量,m_a	FL^-1T²	单桩100 kg,四桩400 kg
重力加速度,g	LT^-2	1
l	L	1/50
E	FL^-2	1/3.5
ρ	FL^-4T²	1
应力,σ	FL^-2	1/3.5
应变,ε	—	1
泊松比,μ	—	1

土类	天然含水量,w/%	液限,w_L/%	ρ/(g·cm^-3)	黏聚力,c/kPa	内摩擦角,φ/(°)	孔隙比
淤泥	45.6	41.3	1.77	8	10	2.15
强风化花岗岩	11.2	—	2.56	22.5	43	—

震陷土层变化下变截面单、群桩动力响应差异

Dynamic Response Difference of Single Pile and Pile Group with Variable Section in Variation of Seismic Subsidence Soil Layer

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