土性对土–桩–核岛结构动力相互作用影响的试验研究

doi:10.13722/j.cnki.jrme.2021.1287

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摘要为了深入研究不同地基土层性质对于土–桩–核岛结构体系抗震性能的影响和相关桩基的震害机制，配制3种不同硬度的地基土模型分别进行振动台试验，并对试验宏观现象和试验数据进行分析对比。试验结果表明：地基土硬度对于地震荷载作用下“土–桩–上部结构”相互作用体系具有重要影响，随着地基土硬度的减小，土结分离现象更加明显，桩基的震害现象也更加严重；由于上部结构较大的惯性力作用，地基土硬度较小时，基桩不仅在桩头处出现破坏，在5～6倍桩径深度处桩身也出现了开裂和折断的破坏现象；为保证核电工程基础的地震安全性，建议加固或选择剪切波速大于300 m/s的土层作为地基。

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	汪刚1
	景立平1
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	王友刚3
	涂健3
	齐文浩1

关键词 ：桩基工程, 振动台试验, 土–桩动力相互作用, 桩基震害机制, 抗震设计

Abstract：In order to intensively study the influence of different subsoil properties on the seismic performance of soil-pile-nuclear island structure system and the related seismic damage mechanism of pile foundations，three kinds of subsoil models with different stiffness were prepared for shaking table test，and the macro phenomena and test data were analysed and compared. The test results show that subsoil stiffness has a great influence on the seismic-soil-pile-superstructure interaction system. With the decrease of the subsoil stiffness，the phenomenon of soil-structure separation is more obvious，and the seismic damage of pile foundation is more serious. Due to large inertia force of the superstructure and compliance of the subsoil，the foundation pile is damaged not only at the pile head，but also at the depth of 5–6 times the pile diameter. In order to ensure the seismic safety of nuclear power engineering foundation，it is recommended to strengthen or select the soil layer with shear wave velocity greater than 300 m/s as the foundation subsoil.

Key words： pile foundations shaking table test seismic-soil-pile-interaction pile seismic damage mechanism seismic design

引用本文:

汪刚1，景立平1，2，王友刚3，涂健3，齐文浩1. 土性对土–桩–核岛结构动力相互作用影响的试验研究[J]. 岩石力学与工程学报, 2022, 41(11): 2353-2364.
WANG Gang1，JING Liping1，2，WANG Yougang3，TU Jian3，QI Wenhao1. Experimental study on the influence of soil properties on seismic-soil-pile-nuclear island structure interaction. , 2022, 41(11): 2353-2364.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1287 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I11/2353

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