盆地面波效应作用下地铁车站动力响应分析
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摘要
为探究浅埋地下结构在盆地面波效应作用下的地震反应特性,文章以北京某两层两跨箱型框架结构地铁车站为工程背景,利用FLAC有限差分软件,针对盆地面波效应作用与单一地震波作用下地铁车站的动力响应进行了分析对比。分析结果表明,在盆地面波效应作用下地下结构的动力响应有明显的放大作用,且随着地下结构深度的增加,相应部位的放大系数有所减小;在盆地面波效应作用下没有改变原有地下结构抗震薄弱点位置;在盆地面波效应作用下,地震波的地震动特性对地下结构的影响起着非常重要的作用。
In order to explore the characteristics of the seismic response of shallow-depth underground structures affected by basin surface waves, a comparative analysis regarding the dynamic response of subway stations under the effects of a basin surface wave versus a single seismic wave was performed with FLAC finite-difference software using a double-layer two-span box framework of a subway station as an example. The results show that: the dynamic response of underground structures is amplifiedunder the basin surface waveeffect and theamplifying factors of relevant parts are reduced to some extent with an increased structure depth; the weak points of underground structures are not changed under the basin surface effect in light of aseismicity; and it plays a key role in the ground motion characteristics of a seismicwave on underground structures.
In order to explore the characteristics of the seismic response of shallow-depth underground structures affected by basin surface waves, a comparative analysis regarding the dynamic response of subway stations under the effects of a basin surface wave versus a single seismic wave was performed with FLAC finite-difference software using a double-layer two-span box framework of a subway station as an example. The results show that: the dynamic response of underground structures is amplifiedunder the basin surface waveeffect and theamplifying factors of relevant parts are reduced to some extent with an increased structure depth; the weak points of underground structures are not changed under the basin surface effect in light of aseismicity; and it plays a key role in the ground motion characteristics of a seismicwave on underground structures.
引文
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[2]李雪强.沉积盆地地震效应研究[D].哈尔滨:中国地震局工程力学研究所,硕士论文,2011Li Xueqiang.Study on Seismic Effect of Sedimentary Basin[D].Harbin:Institute of Engineering Mechanics,China Earthquake Administration,Master Thesis,2011
[3]G raves RW,Pitarka A,Somerville PG.Ground Motion Amplification in the Santa Monica Area:Effects of Shallow Basin Edge Structure[J].Bulletin of the Seismological Society of America,1998,(88):1224-1242
[4]谢小碧.地震波在盆地中的传播特点及其对盆地中震害的影响[J].山西地震,1999,(1):1-5Xie Xiaobi.Propagation Characters of Seismic Wave in Basin and Its Impact on Earthquake Disaster[J].Earthquake Research in Shanxi,1999,(1):1-5
[5]范会吉,姚陈.地震波的散射与盆地的场地效应[J].中国地震,1996,12(2):209-223 Fan Huiji,Yao Chen.Scattering of Seismic Waves and Site Effects of Basin-like Models[J].Earthquake Research in China,1996,12(2):209-223
[6]荆韦庄.地震反应谱及盆地地震响应分析[D].合肥:合肥工业大学,硕士论文,2009Jing Weizhuang.Seismic Response Spectrum and Seismic Response Analysis of Basin[D].Hefei:Hefei University of Technology,Master Thesis,2009
[7]赵志新,徐纪人.盆地构造地震地面运动速度和加速度分布特征的数值模拟[J].地球物理学报,2005,48(5):1085-1091Zhao Zhixin,Xu Jiren.Velocity and Acceleration Characteristics of Seismic Ground Motions Related to Basin Structure[J].Chinese Journal of Geophysics,2005,48(5):1085-1091
[8]周红,陈晓非.凹陷地形对Rayleigh面波传播影响的研究[J].地球物理学报,2007,50(4):1182-1189Zhou Hong,Chen Xiaofei.A Study on the Effect of Depressed Topography on Rayleigh SurfaceWave[J].Chinese Journal of Geophysics,2007,50(4):1182-1189
[9]索然绪,王艳艳.瑞利波作用下隧道洞口段的抗震设防长度[J].现代隧道技术,2011,48(4):13-18Suo Ranxu,WangYanyan.Seismic Fortification Length of Tunnel Portals under Rayleigh Wave Action[J].Modern Tunnelling Technology,2011,48(4):13-18
[10]刘继国,郭小红,程勇.高地震烈度下超大直径海底盾构隧道地震响应分析[J].现代隧道技术,2011,48(3):53-58Liu Jiguo,Guo Xiaohong,Cheng Yong.Seismic Response Analysis on Super Large-diameter Undersea Shield Tunnel under High Seismic Intensity[J].Modern Tunnelling Technology,2011,48(3):53-58
[11]郑升宝,蒋树屏,王晓雯,等.公路隧道减震模型试验及数值模拟[J].现代隧道技术,2011,48(4):59-64Zheng Shengbao,Jiang Shuping,Wang Xiaowen,et al.Model Test and Numerical Simulation of Vibration Attenuation for Highway Tunnels[J].Modern Tunnelling Technology,2011,48(4):251-255
[12]舒磊,龚伦,仇文革,等.下穿引水隧洞对铁路隧道地震效应的影响研究[J].现代隧道技术,2012,49(6):93-100Shu Lei,Gong Lun,Qiu Wenge,et al.Study of the Influence of an Underpassing Diversion Tunnel on the Seismic Response in an Existing Railway Tunnel[J].Modern Tunnelling Technology,2012,49(6):93-100
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