【作者】 张丹；

【导师】 王明年；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2012， 硕士

【摘要】 本文以2008年汶川特大地震为背景,结合交通部西部建设科技项目“公路隧道抗震及减震技术研究”,对国内外隧道横断面抗震计算方法进行调研。通过三维数值模拟计算,对浅埋隧道衬砌结构抗震计算方法进行了研究。论文内容主要由三方面组成：浅埋隧道衬砌结构水平地震合力与埋深的关系；上方土柱产生的地震附加荷载向衬砌结构传递的力学机制,隧道衬砌结构地震附加荷载确定方法；对衬砌与围岩间脱空区的分析。通过本文的分析总结,水平地震力合力随隧道埋深不是线性增加的；而是先增加到达一个峰值,然后减小到某个稳定值。而且在7度、9度、11度这三种烈度条件下,当隧道埋深为25m时,水平地震力合力都有最大值。和现行规范对比,可知规范在计算低烈度(小于等于9度)时的地震力,只有在埋深位于5m-25m区间时,结果才是较适用的。明确了上方土柱附加地震力的传递机制,进而得到了隧道衬砌结构地震附加荷载的分布与数值表达。通过对衬砌与围岩间脱空区的分析可知,地震烈度为7、9度时,脱空区出现概率较大的主要分布在拱肩与拱腰、拱脚处,进而对静力计算方法中的弹力抗力的范围与量值进行调整,使隧道抗震静力计算方法更加符合实际。更多还原

【Abstract】 This paper takes2008’Wenchuan earthquake’as background and in combination with the Ministry of Western science and technology project" seismic and damping technology research of highway tunnel construction ", also has done a lot of research of tunnel cross section aseismic calculation method at home and abroad. By numerical calculation, aseismic calculation method of shallow buried tunnel lining structure is studied.Main content of the paper consists of three parts:the relationship between horizontal seismic force of shallow buried tunnel lining structure and buried depth; mechanism of seismic load generated by soil column attached to lining structure, also all seismic loads of lining and surrounding rock; analysis of void area between the lining and surrounding rock.With this analysis, horizontal earthquake force varing with the depth of the tunnel is not a linear increase; while increases and reaches a peak at first, and then decreases to a steady value. Also at this three intensity conditions of7degree,9degree,11degree, horizontal earthquake force will have a maximum value when the buried depth of tunnel is25m. And the results of current codes are suitable only in depth in the5m~25m interval, when at low intensity (less than or equal to9degree). Transmission mechanism of top soil column additional earthquake force is clear, also with the tunnel lining structure seismic load distribution and numerical expression. By the analysis of void area between lining and surrounding rock, the void areas are mainly distributed in the spandrel and arch waist when in the seismic intensity of7,9degree, then the elastic resistance range and value of static calculation method is adjusted, so that the tunnel seismic method is more accord with reality.更多还原