地震作用下隧道复合衬砌动力响应特性分析

发布时间：2017-12-28 12:29

本文关键词：地震作用下隧道复合衬砌动力响应特性分析　出处：《重庆交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：目前城市主路隧道通常修建单洞三车道、四车道等大断面隧道,且越来越多,而国内对大断面隧道的抗震研究较少,本文以重庆双碑隧道为研究背景开展相关复合衬砌动力响应问题的研究,其主要研究工作如下:1.总结已经发生的隧道震害资料,探讨隧道在地震作用下的破坏形式、机理及其影响因素;研究粘弹性人工边界条件、地震波输入时长、地震波基线漂移校正及滤波等对隧道地震动力数值模拟结果有重要影响的几个问题,并找到用ANSYS软件进行动力计算时初始应力场的输入方法。2.建立大断面隧道洞身复合衬砌的三维数值模型进行地震响应计算和分析,改变某一个参数,保持其它参数不变,研究不同埋深、不同衬砌支护强度、不同围岩级别、不同地震烈度下的复合衬砌各关键部位的位移、加速度、速度及应力时程等数据,并据此分析衬砌结构地震动力响应规律。3.依据钢筋混凝土偏心受压构件破坏时的强度校核方法,计算得出不同支护强度、不同围岩级别、不同地震烈度下复合衬砌各关键部位的安全系数变化规律及进行对比分析,研究发现隧道埋深越深,地震响应越小,埋深8D是地震动力响应时深浅埋的分界线;衬砌支护强度越高,安全系数越高,但其受力也越大;围岩越好,衬砌水平剪切错动越不明显,在围岩过渡区应力突变衬砌易破坏;地震烈度越大,衬砌响应越大,在地震波激励方向上的位移远远大于其它方向位移;边墙处的安全系数是衬砌结构最低的,是抗震最薄弱环节。4.依据本文研究得出的大断面隧道复合衬砌的安全系数变化规律,提出大断面隧道相应的减震措施建议,为大断面隧道抗减震设计与施工提供参考依据。
[Abstract]:The city main road tunnel construction is usually single hole with three lanes, four lanes of large section tunnel, and more and more, while the domestic of large section tunnel seismic research, this paper studies the background to carry out the relevant dynamic response of composite lining in Chongqing Shuangbei tunnel, the main research work is as follows: 1. summarize the tunnel earthquake the data has changed, the failure form, mechanism and influence factors of tunnel under earthquake; seismic study on viscoelastic artificial boundary conditions, long wave input seismic wave, baseline drift correction and filtering problems of tunnel seismic dynamic numerical simulation results have important influence, and find the dynamic calculation of the initial input method of stress field by using ANSYS software. 2. to establish a three-dimensional numerical model of large section tunnel composite lining calculation and analysis of the seismic response, change one parameter, keeping other parameters constant, of different depth and different lining strength, different rock mass, different seismic intensity of the lining of the key parts of the displacement, acceleration, velocity and stress force time history data, and based on the analysis of the seismic dynamic response of tunnel lining structure. 3. on the basis of failure of reinforced concrete eccentric compression member when the strength check method, calculated the safety coefficient of variation of different support strength, different classes of surrounding rock under different earthquake intensity, the lining of the key parts of the research and comparative analysis, found that the deeper the depth, the seismic response is small and the depth of 8D is the dividing line between the earthquake dynamic response of buried depth; lining strength is high, the safety coefficient is high, but the stress is greater; the better the surrounding rock, lining shear is not obvious, in the transition zone of surrounding rock stress mutation lining easy to damage; the earthquake intensity is greater, the greater the response in the lining, seismic wave excitation the displacement direction is far greater than the other direction; the safety factor of side wall is the lowest lining structure, is the weakest link of seismic. 4., according to the variation law of safety factor of composite lining of large section tunnel obtained in this paper, the corresponding damping measures for large section tunnel are put forward, so as to provide reference for the design and construction of large section tunnel.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U455.91

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