双洞错距隧道洞口段地震动力响应数值模拟分析
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摘要
为深入了解隧道在地震过程中的破坏机理及其洞口段的动力响应规律,以具有间距和错距的实际隧道为原型,建立数值计算模型并进行了计算分析.计算结果表明:1)对于双洞错距隧道,隧道洞口段衬砌横断面的相对位移、最大Mises应力和加速度幅值受地震荷载激振方向的影响较大.即使在同一方向地震荷载作用下,左、右洞洞口段的动态响应仍有较大区别,而隧道洞身段的动态响应相近.2)当地震荷载在某一方向或其他组合方向上施加后,衬砌上将同时存在空间上任意方向的加速度矢量,且衬砌加速度幅值在洞口处具有放大现象.
To understand the tunnels' damage mechanism and the law of the dynamic response in the portal section,this paper establishes a numerical model based on the actual tunnel with spaces and staggered space and had the calculation.The calculating results show that for two parallel tunnels with staggered space,the relative displacement,maximum Mises stress and the amplitude of acceleration in the tunnel liner cross-section of portal section are affected by the vibration direction of seismic load.The dynamic responses of portal section still have significant differences between the left and the right tunnels even in the same vibration direction;however,the dynamic responses of the tunnel trunk section are close.When the seismic load is acted on one direction or the other combination direction,the acceleration vector in any direction of space will exist simultaneously on the lining,and the lining acceleration amplitude on the tunnel entrance is magnified.
To understand the tunnels' damage mechanism and the law of the dynamic response in the portal section,this paper establishes a numerical model based on the actual tunnel with spaces and staggered space and had the calculation.The calculating results show that for two parallel tunnels with staggered space,the relative displacement,maximum Mises stress and the amplitude of acceleration in the tunnel liner cross-section of portal section are affected by the vibration direction of seismic load.The dynamic responses of portal section still have significant differences between the left and the right tunnels even in the same vibration direction;however,the dynamic responses of the tunnel trunk section are close.When the seismic load is acted on one direction or the other combination direction,the acceleration vector in any direction of space will exist simultaneously on the lining,and the lining acceleration amplitude on the tunnel entrance is magnified.
引文
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[2]林皋.地下结构抗震分析综述:下[J].世界地震工程,1990,6(3):1-10.LIN Gao.Summarization on antiseismatic analysis ofunderground structure:Ⅱ[J].World EarthquakeEngineering,1990,6(3):1-10.(in Chinese)
[3]林皋,梁青槐.地下结构的抗震设计[J].土木工程学报,1996,29(1):15-24.LIN Gao,LIANG Qing-huai.Aseismic design ofunderground structures[J].China Civil EngineeringJournal,1996,29(1):15-24.(in Chinese)
[4]黄胜,陈卫忠,杨建平,等.地下工程地震动力响应及抗震研究[J].岩石力学与工程学报,2009,28(3):483-490.HUANG Sheng,CHEN Wei-zhong,YANG Jian-ping,etal.Research on earthquake-induced dynamic responsesand aseismic measures for underground engineering[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(3):483-490.(in Chinese)
[5]陈灿寿,戚承志,钱七虎,等.浅埋地下结构顶板在竖向地震作用下的动力响应[J].世界地震工程,2010,26(4):86-92.CHEN Can-shou,QI Cheng-zhi,QIAN Qi-hu,et al.Dynamic response of the roof slab of a shallowly buriedunderground structure under vertical seismic excitation[J].World Earthquake Engineering,2010,26(4):86-92.(in Chinese)
[6]张雨霆,肖明,刘波.高地震烈度区水电站地下厂房结构震损机理分析[J].四川大学学报:工程科学版,2011,43(1):70-76.ZHANG Yu-ting,XIAO Ming,LIU Bo.Analysis ofseismic damage mechanism of underground powerhousestructures of hydropower plants in high seismic intensityregion[J].Journal ofSichuan University:EngineeringScience Edition,2011,43(1):70-76.(in Chinese)
[7]刘晶波,刘祥庆,李彬.地下结构抗震分析与设计的Pushover分析方法[J].土木工程学报,2008,41(4):73-80.LIU Jing-bo,LIU Xiang-qing,LI Bin.A pushover analysismethod for seismic analysis and design of undergroundstructures[J].China Civil Engineering Journal,2008,41(4):73-80.(in Chinese)
[8]刘如山,邬玉斌,杜修力.用纤维模型对地下结构地震破坏的数值模拟分析[J].北京工业大学学报,2010,36(11):1488-1495.LIU Ru-shan,WU Yu-bin,DU Xiu-li.Numericalsimulation analysis on earthquake damage of undergroundstructure with fiber model[J].Journal of BeijingUniversity of Technology,2010,36(11):1488-1495.(inChinese)
[9]重庆交通科研设计院.JTG D70—2004公路隧道设计规范[S].北京:人民交通出版社,2004.
[10]孙铁成,高波,皇民,等.地震动时频分析在隧道动力响应分析中的应用[J].北京工业大学学报,2009,35(11):1491-1498.SUN Tie-cheng,GAO Bo,HUANG Min,et al.Applications of time-frequency analysis on earthquakewave in the dynamic response analysis of tunnel[J].Journal of Beijing University of Technology,2009,35(11):1491-1498.(in Chinese)
[11]孙铁成.双洞错距山岭隧道洞口段地震动力响应及减震措施研究[D].成都:西南交通大学土木工程学院,2009.SUN Tie-cheng.Study on earthquake responses andvibration-absorption measures for two-tunnels of mountaintunnel with staggered space[D].Chengdu:School ofCivil Engineering,Southwest Jiaotong University,2009.(in Chinese)
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