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基于OpenSees的饱和土场地中地下结构地震反应研究

刘曦 李亮 李果

刘曦,李亮,李果,2024. 基于OpenSees的饱和土场地中地下结构地震反应研究. 震灾防御技术,19(3):548−557. doi:10.11899/zzfy20240313. doi: 10.11899/zzfy20240313
引用本文: 刘曦,李亮,李果,2024. 基于OpenSees的饱和土场地中地下结构地震反应研究. 震灾防御技术,19(3):548−557. doi:10.11899/zzfy20240313. doi: 10.11899/zzfy20240313
Liu Xi, Li liang, Li guo. Study on Seismic Response of Underground Structure in Saturated Soil Deposit Based on OpenSees[J]. Technology for Earthquake Disaster Prevention, 2024, 19(3): 548-557. doi: 10.11899/zzfy20240313
Citation: Liu Xi, Li liang, Li guo. Study on Seismic Response of Underground Structure in Saturated Soil Deposit Based on OpenSees[J]. Technology for Earthquake Disaster Prevention, 2024, 19(3): 548-557. doi: 10.11899/zzfy20240313

基于OpenSees的饱和土场地中地下结构地震反应研究

doi: 10.11899/zzfy20240313
详细信息
    作者简介:

    刘曦,女,生于1998年。硕士研究生。主要从事土动力学方面的研究。E-mail:1556652151@qq.com

    通讯作者:

    李亮,男,生于1975年。教授,博士生导师。主要从事土动力学方面的研究。E-mail:liliang@bjut.edu.cn

Study on Seismic Response of Underground Structure in Saturated Soil Deposit Based on OpenSees

  • 摘要: 应用OpenSees有限元计算程序,选取某地铁车站结构为主要分析对象,构建了饱和土-地下结构体系地震反应运算模型,并利用该模型进行系统的地震反应计算。将现场饱和土动力反应视为饱和两相介质近场波动问题,选取时域显式数值算法进行计算,同时考虑了土体的弹塑性。研究结果显示:(1)因选取弹塑性土体本构,土体-地下结构的位移反应时程和输入地震动的位移时程体现出了显著性差异。(2)对于两层三跨地下结构,在以剪切波形式输入的地震动作用下,顶板的峰值加速度和侧向位移最大,中板次之,底板最小,场地土体对地震波具有放大效应,顶层的层间位移大于底层。(3)在地震动作用下,地下结构不同区域应力时程的改变规律存在非常显著的差异。中柱底部与底板节点处的应力峰值最大。地震动输入结束时,结构存在残余应力。
  • 图  1  地铁车站结构横截面(单位:毫米)

    Figure  1.  Cross section of subway station structure(Unit:mm)

    图  2  场地土层分层图

    Figure  2.  Stratified diagram of soil deposits

    图  3  饱和土-地下结构体系地震反应有限元计算模型

    Figure  3.  Finite element model for seismic response of saturated soil deposits-underground structure system

    图  4  地下结构计算单元

    Figure  4.  Calculating elements of underground structure

    图  5  PIMY模型的屈服面

    Figure  5.  Yield surfaces of PIMY constitutive model

    图  6  Kobe地震记录位移时程

    Figure  6.  Displacement time history of Kobe earthquake record

    图  7  Kobe地震记录加速度时程

    Figure  7.  Adjusted acceleration time history of Kobe earthquake record

    图  8  不同时刻饱和土场地加速度云图

    Figure  8.  Acceleration nephogram of saturated soil deposits at different times

    图  9  不同时刻饱和土场地水平位移云图

    Figure  9.  Horizontal displacement nephogram of saturated soil deposits at different times

    图  10  不同时刻饱和土场地竖向位移云图

    Figure  10.  Vertical displacement nephogram of saturated soil deposits at different times

    图  11  观测点A水平位移时程

    Figure  11.  Horizontal displacement time history of node A

    图  12  观测点B水平位移时程

    Figure  12.  Horizontal displacement time history of node B

    图  13  观测点A孔压时程

    Figure  13.  Pore pressure time history of node A

    图  14  观测点B孔压时程

    Figure  14.  Pore pressure time history of node B

    图  15  地下结构顶板加速度时程

    Figure  15.  Acceleration time history of top slab of underground structure

    图  16  地下结构中板加速度时程

    Figure  16.  Acceleration time history of middle slab of underground structure

    图  17  地下结构底板加速度时程

    Figure  17.  Acceleration time history of bottom slab of underground structure

    图  18  地下结构顶板位移时程

    Figure  18.  Displacement time history of top slab of underground structure

    图  19  地下结构中板位移时程

    Figure  19.  Displacement time history of middle slab of underground structure

    图  20  地下结构底板位移时程

    Figure  20.  Displacement time history of bottom slab of underground structure

    图  21  单元A应力时程

    Figure  21.  Stress time history element A

    图  22  单元B应力时程

    Figure  22.  Stress time history element B

    图  23  单元C应力时程

    Figure  23.  Stress time history element C

    图  24  单元D应力时程

    Figure  24.  Stress time history element D

    图  25  单元E应力时程

    Figure  25.  Stress time history element E

    图  26  单元F应力时程

    Figure  26.  Stress time history element F

    图  27  单元G应力时程

    Figure  27.  Stress time history element G

    图  28  单元H应力时程

    Figure  28.  Stress time history element H

    表  1  场地土体物理力学参数

    Table  1.   Site soil physical and mechanical parameters

    土层 重度/(kN·m−3) 内摩擦角/(°) 弹性模量/MPa 泊松比 孔隙率
    素填土 19.0 16 1.0 0.4
    细砂 19.0 30 7.5 0.3 0.474
    黏土 19.3 16 13.2 0.42
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出版历程
  • 收稿日期:  2023-03-28
  • 网络出版日期:  2024-10-15
  • 刊出日期:  2024-09-01

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