隧道设置减震层减震机制研究.pdf

第 35 卷第 3 期岩石力学与工程学报 Vol . 35 No . 3 2016 年 3 月 Chinese Journal of Rock Mechanics and Engineering March ,2016 收稿日期: 2015 – 05 – 16 ;修回日期: 2015 – 07 –07 基金项目: 国家自然科学基金资助项目(51178398) Supported by the National Natural Science Foundation of China(Grant No. 51178398) 作者简介: 王帅帅(1988 –) ,男, 2012 年毕业于西南交通大学土木工程学院,现为博士研究生,主要从事隧道及地下工程方面的研究工作。 E-mail : 8366wangshuai@ DOI :. 隧道设置减震层减震机制研究王帅帅, 高波(西南交通大学交通隧道工程教育部重点实验室,四川成都 610031) 摘要: 通过 Fourier-Bessel 函数展开法,推导平面 SV 波垂直入射下半无限弹性介质中圆形双层衬砌结构、围岩–减震层–衬砌洞室的动应力集中系数级数解,分析入射波频率、减震层弹性模量和厚度对动应力集中系数的影响, 并结合数值模拟分析结果对比,深入研究减震层减震机制。研究结果表明:入射频率对衬砌动应力集中系数有显著影响,减震层对低频波具有较好的减震效果;由于减震层剪切模量低,围岩和隧道可以剪切变形,从而减小了作用在衬砌外部的法向作用力,降低了衬砌内侧最大动应力集中系数,但围岩和衬砌外侧切向应力增大;随着减震层与围岩弹性模量之比减小,减震层厚度增大,二次衬砌动应力集中系数变小,减震层与围岩的弹性模量比宜低于 1/10 ~1/20 ,和减震层弹性模量对应,存在一个最优的减震层厚度值。以一公路隧道为背景,开展隧道减震层结构大型振动台试验研究,结果表明:隧道衬砌设置减震层后,可以显著降低衬砌内力,减小衬砌裂缝的数量。关键词: 隧道工程;平面 SV 波;减震层;减震机制;动应力集中系数中图分类号: U 45 文献标识码: A 文章编号: 1000 –6915(2016)03 –0592 – 12 Damping mechanism and shakin g table test on mountain tunnel linings wi th buffer layers WANG Shuaishuai ,GAO Bo (MOE Key Laboratory of Transportation Tunnel Engineering ,Southwest Jiaotong University ,Chengdu ,Sichuan 610031 ,China ) Abstract :With Fourier-Bessel function expansion ,the dynamic stress concentration factor of the cylindrical composite-lining cavity subjected to vertically incident plane SV waves was derived for an half elastic space with double lining and buffer layer ,named as rock-buffer layer-lining. The factors affecting the dynamic stress characteristic of the lining structure such as the incident wave frequency ,elastic modulus and thickness of the buffer layer were discussed. The damping mechanism of the buffer layer was studied with the solution and the numerical simulation. The results showed that the frequency of the incident SV waves played an important role in the dynamic stress concentration factor of bined-lined cavity ,and the dynamic stress concentration fac