核电厂房群桩地震动力响应振动台试验  

Shaking table tests on seismic dynamic response of pile groups under nuclear structures

作　　者：陆新宇 景立平[1] 齐文浩[1] 夏峰[1,2] LU Xinyu;JING Liping;QI Wenhao;XIA Feng(Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;First Crust Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China)

机构地区：[1]中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江哈尔滨150080 [2]中国地震局第一监测中心,天津300180

出　　处：《岩土工程学报》2023年第S02期91-97,共7页Chinese Journal of Geotechnical Engineering

基　　金：中国地震局工程力学研究所基本科研业务费专项资助项目(2019B10)。

摘　　要：采用大型振动台试验的方法,建立了非基岩场地-群桩基础-核电安全厂房体系模型,研究了核电结构群桩基础的地震响应、内力分布及破坏现象。试验的地基土体模型为均匀粉质黏土,采用环形层叠剪切箱考虑土体的边界效应;由9根基桩按照3×3对称布置,组成群桩基础,基桩的直径为10 cm、长度为200 cm;核电安全厂房简化为3层框架-剪力墙结构模型。研究结果表明:在水平地震荷载作用下,群桩基础的主要破坏形式为弯曲拉伸破坏,破坏范围为距承台以下4~7倍桩径范围内,联结承台桩顶部的破坏最为严重,所承受的弯矩也大于其他位置。A non-rock site-pile group foundation-safety-related nuclear structure system model is established by using the large-scale shaking table test method to study the seismic response,distribution of internal force and failure of pile-group foundation under nuclear power structures.The soil model in the tests is the uniform silted clay,and the circular laminar shear container is used to take the boundary effects of soil into consideration.The pile-group foundation is composed of 9 piles with a diameter of 10 cm and a length of 200 cm,arranged symmetrically according to 3×3.The actual safety-related nuclear structures are simplified into a three-layer frame-shear wall structure model.The research results show that the main failure mode of the pile-group foundation is bending tensile failure,most of which is located in the depth range of 4~7 times the pile diameter from junction between the pile top and the cap,and damage of the junction is the most serious,where the bending moment is also greater than that at other positions.

关 键 词：群桩基础 核电厂房 土质地基 振动台试验 

分 类 号：TU43[建筑科学—岩土工程]