[1]荚颖,邢彦朋.不同密实度液化场地桥梁桩基地震动力响应数值研究[J].燕山大学学报,2018,42(4):370-376.[doi:10.3969/j.issn.1007-791X.2018.04.013]
 JIE Ying,XING Yanpeng.Numerical study on seismic dynamic response of bridge pile foundation in liquefaction site with different densities[J].Journal of YanShan University,2018,42(4):370-376.[doi:10.3969/j.issn.1007-791X.2018.04.013]
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不同密实度液化场地桥梁桩基地震动力响应数值研究
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《燕山大学学报》[ISSN:1007-791X/CN:13-1219/N]

卷:
42
期数:
2018年第4期
页码:
370-376
栏目:
力学与土木工程
出版日期:
2018-09-30

文章信息/Info

Title:
Numerical study on seismic dynamic response of bridge pile foundation in liquefaction site with different densities
文章编号:
1007-791X(2018)04-0370-07
作者:
荚颖*邢彦朋
燕山大学 建筑工程与力学学院,河北 秦皇岛 066004
Author(s):
JIE YingXING Yanpeng
School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao,Hebei 066004,China
关键词:
液化场地桥梁桩基动力反应密实度
Keywords:
liquefaction site bridge pile foundation dynamic response compactness
分类号:
TU42
DOI:
10.3969/j.issn.1007-791X.2018.04.013
文献标志码:
A
摘要:
利用二相饱和土u-p方程实施桥梁双桩基础在液化饱和松砂、中密砂、密砂中的数值模拟,通过对比超静孔压比、位移、应力应变关系及弯矩等,获得桩基在不同密实程度饱和砂土中动力反应的差异性。结果表明,上部结构动力响应与场地砂土的密实程度直接相关,砂土越密实,其强度及刚度软化越慢,上部结构及桩基础在地震作用下发生位移越小,桩基受到的弯矩却较大;而松砂有效应力丧失很快,上部结构及桩基受到弯矩较小,位移较大,说明桩基位移主要受液化土流动的影响。通过双桩弯矩及位移对比,发现密砂场地群桩效应更显著。
Abstract:
The numerical simulations of the bridge double-pile foundation in liquefied saturated loose sand,medium dense and dense sand are carried out by using u-p equation of two phase saturated soil. By comparing the excess pore water pressure ratios,displacements,stress-strain relationships and bending moments,the difference of dynamic response for pile foundation in saturated sand with different compaction degrees is obtained. The results reveal that the dynamic response of the superstructure is directly related to the compaction degree of the sand soil. The thicker the sand density is,the slower the strength and stiffness softening,and the smaller the displacement of the superstructure and pile foundation under seismic action,while the larger the bending moment of the pile foundation is. The loss of effective stress for loose sand is very fast,the bending moment of the pile foundation and the superstructure is smaller but the displacement is larger,which indicates that the displacement of the pile foundation is mainly influenced by the flow of liquefied soil. By comparing the bending moments and displacements of two piles,it is found that the pile group effect is more significant in dense sand ground.

备注/Memo

备注/Memo:
收稿日期:2018-01-05        责任编辑:温茂森
基金项目:国家自然科学基金青年基金资助项目(41402261);河北省自然科学基金青年基金资助项目(D2016203329)
作者简介:荚颖(1981-),女,辽宁沈阳人,博士,副教授,主要研究方向为地震过程桩土相互作用数值模拟,Email:jieying810311@126.com
更新日期/Last Update: 2018-11-29