工程地质学报
     首页 |  期刊简介 |  编委会 |  投稿指南 |  期刊订阅 |  留言板 |  联系我们 |  广告合作 |  会议信息 |  English
工程地质学报  2018, Vol. 26 Issue (5): 1272-1278    DOI: 10.13544/j.cnki.jeg.2018113
岩土体工程地质 最新目录 | 下期目录 | 过刊浏览 | 高级检索  |   
脉冲地震动中竖向加速度对场地液化的影响
高广运1,2, 李永佳1,2, 董文悝3
1. 同济大学地下建筑与工程系 上海 200092;
2. 同济大学岩土及地下工程教育部重点实验室 上海 200092;
3. 悉尼科技大学土木与环境工程系 新南威尔士州 2007
EFFECT OF VERTICAL ACCELERATION ON SITE LIQUEFACTION IN PULSE GROUND MOTION
GAO Guangyun1,2, LI Yongjia1,2, DONG Wenkui3
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092;
2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092;
3. Department of Civil and Environmental Engineering, University of Technology Sydney, NSW Australia 2007
 全文: PDF (1853 KB)   HTML( )   输出: BibTeX | EndNote (RIS)      背景资料
摘要 为研究近断层脉冲地震动中竖向加速度对砂土场地液化的影响,基于有限元平台OpenSees开发的边界面塑性本构模型,建立了动单剪单元试验模型和饱和砂土三维有限元模型。选取台湾Chi-Chi地震中10条具有速度脉冲特性的地震波,对比分析了水平双向脉冲波与三向脉冲波作用下土柱竖向位移、循环应力比、孔压比及等效循环周数的差异性,继而明确了脉冲地震动中竖向加速度对砂土液化的影响规律。研究表明,三向脉冲地震波中竖向加速度分量对场地永久位移值影响较小,但使永久位移的发展持时明显增大;土柱循环应力比受竖向地震动影响较小,因此分析脉冲地震动对场地剪切特性的影响时,可将三向脉冲地震动简化为水平双向地震动;考虑竖向地震动的三向脉冲地震波引起的孔压比变化幅度较大,孔压消散时间较长;三向脉冲地震波对应的等效循环周数较大,地震动发展持时长,可认为竖向加速度对场地液化有促进作用。
服务
把本文推荐给朋友
加入我的书架
加入引用管理器
E-mail Alert
RSS
作者相关文章
高广运
李永佳
董文悝
关键词脉冲地震动   OpenSees   竖向加速度   场地液化   场地变形     
Abstract: This paper is based on the boundary surface plastic constitutive model developed with finite element platform OpenSees. It established a dynamic simple shear test model and a three-dimensional finite element model of saturated sand. The target was to explore the effect of vertical component of pulse-like ground motion on the site liquefaction. Therefore, 10 sets of seismic waves with pulse-like characteristics were selected from the Chi-Chi earthquake in Taiwan as inputting load. The simulated vertical displacement, cyclic stress ratio(CSR),pore pressure ratio and equivalent cycle number of the soil column were compared and analyzed under the ground motion with or without the vertical component. Hence the differences clearly defined the effect of vertical acceleration of pulse-like ground motion on the liquefaction of sand. The results show that the vertical acceleration component of tri-directional pulse-like seismic wave has little influence on the final site settlement but significantly increased the duration. As the CSR of soil column is less affected by vertical ground motion, the tri-directional ground motion can be simplified as horizontal bidirectional ground motion when analyzing the shearing properties of the site. The divergence of pore pressure ratio caused by the tri-directional pulse-like seismic wave is larger, and meanwhile, it spends more time to dissipate the pore pressure. Besides, tri-directional pulse-like seismic waves generate a larger equivalent cycle number and increase the duration of ground motion. As a result, the vertical acceleration have more tendency to induce site liquefaction.
Key wordsPulse-like ground motion   OpenSees   Vertical acceleration   Site liquefaction   Site settlement   
收稿日期: 2018-05-26;
基金资助:国家自然科学基金项目(41372271)资助
作者简介: 高广运(1961-),男,博士,教授,博士生导师,主要从事土动力学和桩基的研究.Email:gaoguangyun@263.net
引用本文:   
高广运,李永佳,董文悝. 脉冲地震动中竖向加速度对场地液化的影响[J]. 工程地质学报, 2018, 26(5): 1272-1278.
GAO Guangyun,LI Yongjia,DONG Wenkui. EFFECT OF VERTICAL ACCELERATION ON SITE LIQUEFACTION IN PULSE GROUND MOTION[J]. Journal of Engineering Geology, 2018, 26(5): 1272-1278.
 
没有本文参考文献
[1] 言志信,蔡汉成,王群敏,梁晓波. 纵波作用下边坡动力响应规律研究[J]. 工程地质学报, 2010, 18(4): 497-506.
版权所有 © 2009 《工程地质学报》编辑部    京ICP备05029136号-13
地址:北京市朝阳区北土城西路19号  邮政编码:100029
电话:010-82998121 ,82998124   传真:010-82998121 Email:gcdz@mail.igcas.ac.cn