关山隧道断层破碎带三维有限元地震动力响应  

Seismic Dynamic Response of Fault Fracture Zone at Guanshan Tunnel Based on 3D FEM

作　　者：王永刚[1,2,3] 丁文其[1,2] 景韧 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]甘肃省交通规划勘察设计院有限责任公司,甘肃兰州730030

出　　处：《公路交通科技》2011年第8期115-119,135,共6页Journal of Highway and Transportation Research and Development

基　　金：甘肃省交通厅科研项目(甘交科教2005-16)

摘　　要：以华庄公路关山隧道为研究对象,通过建立大型三维有限元模型,采用一种人工构成的短时间正弦扫描Johnson/Epstein地震记录进行地震动力分析。该记录具有在较短时程内包含较大的实际地震频率范围的特点,从而减小计算分析的持续时间。通过对3种工况(不设置抗震缝、设置2条和3条抗震缝)计算,结果表明:关山隧道衬砌结构的动力响应以横向的受力特征为主,拱顶处横向加速度和横向位移最大,仰拱及拱底处横向加速度峰值和横向位移峰值较小,设置3条抗震缝时的围岩体位移和应力明显优于其他工况,该设计方案能满足8度区抗震要求。Taken Guanshan tunnel of Huazhuang highway as the research subject,the seismic dynamic response characteristic was analyzed by using large-scale 3D finite element model and an artificial synthesized short-time sinusoid scan wave,Johnson/Epstein,which has the character of involving more extensive frequency of seismic wave so as to decreasing computing time.The calculation result of three working conditions（no aseismatic joint,two joints and three joints） demonstrates that（1） the principal mechanic characteristic of the dynamic response of Guanshan tunnel lining is transverse,the maximum transverse acceleration and displacement is distributed in vault,while the peak values of transverse acceleration and displacement are less in inverted arch and arch bottom;（2） setting up three joints for seismic resistance is prior and can satisfy the design requirements in the seismic region with intensity 8.

关 键 词：隧道工程 动力响应 断层破碎带 地震 有限元 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]