| 圆形隧洞对地下地震动的影响:SH波入射 |
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| 引用本文： | 周凤玺,庞宾宾,翟睿智.圆形隧洞对地下地震动的影响:SH波入射[J].西北地震学报,2018,40(5):873-878. |
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| 作者姓名： | 周凤玺 庞宾宾 翟睿智 |
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| 作者单位： | 兰州理工大学土木工程学院, 甘肃 兰州 730050;西部土木工程防灾减灾教育部工程研究中心, 甘肃 兰州 730050,兰州理工大学土木工程学院, 甘肃 兰州 730050,兰州理工大学土木工程学院, 甘肃 兰州 730050 |
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| 基金项目： | 国家自然科学基金（51368038）；甘肃省陇原青年创新创业人才资助项目 |
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| 摘 要： | 地下结构对地震波的散射改变了场地的动力特性,无论是地上建筑还是地下结构的安全评价和抗震设计中,目前均没有很好的考虑由于地下结构的存在对原场地地震动尤其是地下地震动的影响。基于弹性波动理论,运用波函数展开法和镜像原理,分析了弹性半空间中圆形隧洞对柱面SH波的散射问题,得到了含圆形隧洞的弹性半空间位移解析解。通过数值算例分析了圆形隧洞对原场地地震动的影响,重点考察了隧洞埋深、隧洞半径和围岩衬砌模量比等参数的影响规律。结果表明,地下结构对沿线场地的动力特性有着显著的影响,对其自身以及沿线工程结构的抗震设计提供一定参考价值。
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| 关 键 词： | 柱面SH波 圆形隧洞 散射 地下结构抗震 |
| 收稿时间： | 2017/8/20 0:00:00 |
Effect of Circular Tunnels on Earthquake Subground Motions: Incidence of SH Wave |
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| ZHOU Fengxi,PANG Binbin and ZHAI Ruizhi.Effect of Circular Tunnels on Earthquake Subground Motions: Incidence of SH Wave[J].Northwestern Seismological Journal,2018,40(5):873-878. |
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| Authors: | ZHOU Fengxi PANG Binbin and ZHAI Ruizhi |
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| Institution: | School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China;Engineering Research Center of Disaster Mitigation inCivil Engineering of Ministry of Education, Lanzhou 730050, Gansu, China,School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China and School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China |
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| Abstract: | The scattering of seismic waves by underground structures can change the dynamic characteristics of a site. However, the current safety evaluation and seismic design of aboveground and underground structures ignore the influence of underground structures on the ground motion of the original site. The scattering of cylindrical SH waves by a circular tunnel in an elastic half-space is analyzed on the basis of the elastic wave theory by using the wave function expansion method and the mirror image principle, and the analytical solution to displacement in the elastic half-space with a circular tunnel is obtained. The influence of the circular tunnel on the ground motion of the original site is analyzed with numerical examples, and the influence laws of parameters, such as tunnel depth, tunnel radius, and modulus ratio between the lining and surrounding rock, are investigated. Results show that the underground structure drastically affects the dynamic characteristics of the site and can provide some reference value for the seismic design of engineering structures.Keywords:cylindrical SH wave; circular tunnel; scatter; earthquake-resistance of underground structure |
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| Keywords: | cylindrical SH wave circular tunnel scatter earthquake-resistance of underground structure |
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