液化场地高层建筑桩筏基础动力响应试验研究

doi:10.3724/1000-6915.jrme.2024.0677

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摘要为探究强震作用下可液化饱和砂土场地中高层建筑桩筏基础的动力响应规律，设计并制作饱和砂土场地–桩筏基础–高层建筑结构体系缩尺模型，利用离心机振动台试验设备，开展不同地震动强度下的动力响应试验。重点分析土层加速度响应、超孔压比变化、高层建筑结构的动力响应特性及桩筏基础的动力响应规律，探讨场地液化与高层建筑桩筏基础体系动力响应之间的关系。结果表明：高层建筑桩筏基础结构增加了地基液化深度，且群桩间土体的孔压消散缓慢；加速度反应谱幅值随土层深度增加而减小；小震下筏板加速度承放大趋势，强震下筏板的加速度响应先放大后减小；随着地震波峰值加速度增大，桩身最大弯矩逐渐下移，中桩桩顶弯矩较大，但角桩、边桩和中桩的弯矩最大值出现在砂土层分界处；地基液化为上部建筑结构带来一定的减震效果。

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	李雨润1
	邵鼎松1
	李赫1
	王永志2

关键词 ：基础工程, 砂土液化, 桩筏基础, 高层建筑, 离心机振动台试验, 动力响应

Abstract：The objective of the current investigation is to delineate the dynamic response mechanism of piled raft foundation supporting high-rise structures in the context of liquefiable sandy soil under the influence of intense seismic activity. Within the scope of this study，a scaled-down model representing the integrated system of saturated sand strata，piled raft foundation，and high-rise edifice has been meticulously designed and fabricated. Utilizing the centrifuge shaking table apparatus，dynamic response assessments under varying degrees of ground motion intensity have been conducted. The study primarily concentrates on the analysis of soil acceleration responses，variations in excess pore water press ratio，dynamic behavior characteristics of high-rise structural systems，and the underlying dynamic response patterns of pile-raft foundations. Furthermore，the investigation delves into the interrelation between soil liquefaction and the dynamic response of the pile-raft foundation system of high-rise buildings. The empirical findings indicate that the piled raft foundation of high-rise buildings exacerbates the depth of soil liquefaction to a certain degree，with the dissipation of pore pressure occurring at a leisurely pace amidst the pile clusters. The amplitude of acceleration response spectra diminishes with the progression of soil depth. During the occurrence of minor seismic events，the acceleration of the raft tends to escalate，whereas，in the case of major seismic events，the acceleration response of the raft exhibits an initial increase followed by a subsequent decrease. As the peak acceleration of seismic waves intensifies，the maximum bending moment experienced by the pile shafts progressively diminishes，with the upper bending moment of the central pile being more pronounced. Moreover，the maximum bending moments of corner piles，side piles，and central piles are observed at the interface between the sandy soil layers. The liquefaction of the foundation soil provides a damping effect for the superstructure to a certain extent.

Key words： foundation engineering soil liquefaction piled raft foundation high-rise building centrifuge shaking table test dynamic response

引用本文:

李雨润1，邵鼎松1，李赫1，王永志2. 液化场地高层建筑桩筏基础动力响应试验研究[J]. 岩石力学与工程学报, 2025, 44(4): 1013-1025.
LI Yurun1，SHAO Dingsong1，LI He1，WANG Yongzhi2. Experimental study on the dynamic responses of pile-raft foundation of high-rise building in liquefiable site. , 2025, 44(4): 1013-1025.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0677 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I4/1013

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[15]	闫志晓，李雨润，王东升，等. 覆水砂土场地中桥梁群桩基础地震响应离心试验研究[J]. 岩土力学，2023，44(3)：861-872.(YAN Zhixiao，LI Yurun，WANG Dongsheng，et al. Centrifugal experimental study on seismic response of bridge pile group foundation in overlaying water sandy field[J]. Rock and Soil Mechanics，2023，44(3)：861-872.(in Chinese))
[29]	孟上九，刘汉龙，袁晓铭，等. 可液化地基上建筑物不均匀震陷机制的振动台试验研究[J]. 岩石力学与工程学报，2005，24(11)：1 978-1 985. (MENG Shangjiu，LIU Hanlong，YUAN Xiaoming，et al. Shaking table experimental study on the mechanism of inhomogeneous subsidence of buildings on liquefiable foundations[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(11)：1 978-1 985.(in Chinese))
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[30]	徐进，陈卓识，孙锐. 液化土层上建筑物不均匀震陷的数值研究[J]. 地震工程与工程振动，2017，37(4)：158-164.(XU Jin，CHEN Zhuoshi，SUN Rui. Numerical study on earthquake-induced uneven settlement of liquefiable soil layers[J]. Earthquake Engineering and Engineering Dynamics，2017，37(4)：158-164.(in Chinese))
[17]	庄海洋，赵畅，于旭，等. 液化地基上隔震结构群桩与土动力相互作用振动台模型试验研究[J]. 岩土工程学报，2022，44(6)：979-987.(ZHUANG Haiyang，ZHAO Chang，YU Xu，et al. Earthquake responses of piles-soil dynamic interaction system for base-isolated structure system based on shaking table tests[J]. Chinese Journal of Geotechnical Engineering，2022，44(6)：979-987.(in Chinese))
[18]	戴启权，钱德玲，张泽涵，等. 液化场地超高层建筑群桩基础动力响应试验研究[J]. 岩石力学与工程学报，2015，34(12)：2 572-2 579. (DAI Qiquan，QIAN Deling，ZHANG Zehan. Experimental research on dynamic response of pile group[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(12)：2 572-2 579.(in Chinese))
[19]	汪刚，景立平，李嘉瑞，等. 桩-土-上部结构动力相互作用振动台试验研究[J]. 岩石力学与工程学报，2021，40(增2)：3 414-3 424. (WANG Gang，JING Liping，LI Jiarui，et al. Shaking table test study on seismic soil pile superstructure interaction[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(Supp.2)：3 414-3 424. (in Chinese))
[20]	HUSSEIN A F，El N M H. Seismic axial behaviour of pile groups in non-liquefiable and liquefiable soils[J]. Soil Dynamics and Earthquake Engineering，2021，149：106853.
[21]	VISUVASAM J，CHANDRASEKARAN S. Effect of soil-pile-structure interaction on seismic behaviour of RC building frames[J]. Innovative Infrastructure Solutions，2019，4(1)：45.
[22]	王永志，王体强，王海，等. 我国土工离心机进展与研发关键技术[J]. 地震研究，2020，43(3)：592-600.(WANG Yongzhi，WANG Tiqiang，WANG Hai，et al. China?s geotechnical centrifuge progress and research and development of key technologies[J]. Journal of Seismological Research，2020，43(3)：592-600.(in Chinese))
[23]	王体强，王永志，张雪东，等. 超重力振动台柔性叠层箱剪切效能评价方法[J]. 岩土力学，2022，43(3)：719-728.(WANG Tiqiang，WANG Yongzhi，ZHANG Xuedong，et al，Shear performance evaluation of a flexible laminar container with hypergravity shaking table tests[J]. Rock and Soil Mechanics，2022，43(3)：719-728.(in Chinese))
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[26]	中华人民共和国国家标准编写组. GB50011—2010(2016年版) 建筑抗震设计规范[S]. 北京：中国建筑工业出版社，2016.(The National Standards Compilation Group of People?s Republic of China. GB 50011—2010(2016). Code for seismic design of buildings[S]. Beijing：China Architecture and Building Press，2016.(in Chinese))
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