基于大型振动台试验的浅埋偏压隧道橡胶减震层减震效果研究  

A study on the seismic effect of the rubber damping layer in a shallow-buried and unsymmetrial pressure tunnel based on a shaking table test

作　　者：江学良 杨慧 喻雷 覃诗卉 沈搏 王浩冬 林杭[4] JIANG Xueliang;YANG Hui;YU Lei;QIN Shihui;SHEN Bo;WANG Haodong;LIN Hang(School of Civil Engineering and Engineering Management,Guangzhou Maritime University,Guangzhou 510725,China;School of Civil Engineering,South Central University of Forestry and Technology,Changsha 410004,China;Design and Research Institute Branch,Poly Changda Engineering Co.,Ltd.,Guangzhou 510640,China;School of Resources and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]广州航海学院土木与工程管理学院,广州510725 [2]中南林业科技大学土木工程学院,长沙410004 [3]保利长大工程有限公司设计研究院分公司,广州510640 [4]中南大学资源与安全工程学院,长沙410083

出　　处：《振动与冲击》2024年第20期192-199,254,共9页Journal of Vibration and Shock

基　　金：广东省普通高校重点领域专项(2023ZDZX4044,2023ZDZX4045);广东省重点建设学科科研能力提升项目(2022ZDJS092);湖南省自然科学基金(2022JJ31005,2020JJ4944)。

摘　　要：通过几何相似比1∶20的有无橡胶减震层的浅埋偏压隧道大型振动台物理模型试验,研究了橡胶减震层对隧道衬砌加速度和应变减震系数的变化规律,评价了浅埋偏压隧道橡胶减震层的减震效果。研究结果表明:(1)橡胶减震层不改变仰拱处加速度时程曲线的变化趋势,但显著降低了其水平和竖向加速度响应峰值,不论地震波类型、地震激振强度和隧道衬砌位置,橡胶减震层都能显著降低水平和竖向加速度响应;(2)不论地震波类型和激振强度,隧道衬砌左拱肩的水平和竖向加速度减震系数要比右拱肩大不少,这与隧道处于偏压状态有关,地震波类型对水平加速度减震系数的影响要大于对竖向加速度减震系数的影响;(3)加速度减震系数与地震激振强度不存在显著的相关性,但从趋势上看,激振强度增加,减震系数有减小趋势;(4)不论地震波类型、地震激振强度和衬砌位置,橡胶减震层都具有显著的最大主应变和最小主应变减小作用,衬砌最大和最小主应变减震系数与激振强度之间不存在显著的相关关系,但整体上看,减震系数有随激振强度减弱的趋势;(5)橡胶减震层在浅埋偏压隧道中能发挥优良的减震效果,其减震效果与地震强度、减震层材料参数和应力环境密切相关。研究结论可为橡胶减震层在隧道工程中的应用提供一定的参考作用。Based on the shaking table model tests of a shallow-buried and unsymmetrial pressure tunnel with and without a rubber damping layer whose geometric similarity ratio is 1∶20,the damping coefficient change laws of the rubber damping layer on the tunnel lining’s acceleration and strain were studied and the seismic reduction effect of the rubber damping layer were evaluated.The research conclusions are as follows.①The rubber damping layer does not change the trend of the acceleration time history curve at the inverted arch,but significantly reduces its peak horizontal and vertical acceleration response.Regardless of the type of seismic wave,the intensity of seismic excitation,and the location of the tunnel lining,the rubber damping layer can significantly reduce the horizontal and vertical acceleration response.②Regardless of the type of seismic wave and excitation intensity,the horizontal and vertical acceleration damping coefficients of the left arch shoulder of the tunnel lining are much larger than those of the right arch shoulder,which is related to the tunnel being in an eccentric compression state.The impact of seismic wave types on the horizontal acceleration damping coefficient is greater than that on the vertical acceleration damping coefficient.③There is no significant correlation between the acceleration damping coefficient and the seismic excitation intensity,but from a trend perspective,as the excitation intensity increases,the damping coefficient tends to decrease.④Regardless of the type of seismic wave,the intensity of seismic excitation,and the location of the lining,the rubber damping layer has significant reduction effect on the maximum and minimum principal strains.There is no significant correlation between the maximum and minimum principal strain damping coefficients of the lining and the excitation strength,but overall,the damping coefficient shows a trend of weakening with the excitation strength.⑤The rubber damping layer can play excellent damping effect in the shallow-buried an

关 键 词：浅埋偏压隧道 橡胶减震层 振动台试验 减震效果 

分 类 号：U451.5[建筑科学—桥梁与隧道工程] U459.2[交通运输工程—道路与铁道工程]