不同净距的大跨度公路隧道地震响应分析  

Seismic Response Analysis of Large-span Road Tunnels in Different Clear Distance

作　　者：南力辉 杜鑫 Nan Lihui;Du Xin(Zhengzhou Design Institute of China Railway Engineering Consulting Group Co.Ltd,Zhengzhou Henan 450001,China)

机构地区：[1]中铁工程设计咨询集团有限公司郑州设计院,河南郑州450001

出　　处：《石家庄铁路职业技术学院学报》2022年第3期14-17,共4页Journal of Shijiazhuang Institute of Railway Technology

摘　　要：采用ANSYS数值模拟浅埋大跨度公路隧道在不同净距条件下的地震动力响应,对二衬结构控制点的位移、加速度及内力变化规律进行分析,得到如下规律:两隧洞净距在3倍的隧道跨度范围内,位移峰值和水平加速度峰值会随着净距的增大而增大,竖向加速度先减小再增大;二衬结构的内力峰值会随着净距的增大而减小,当净距超过1.5倍跨度时,内力峰值减小的趋势变缓。说明净距的取值对大跨度公路隧道的重要性,建议将1.5倍隧道跨度作为双洞隧道净距的最小取值。The seismic response of shallow buried large-span highway tunnel in different clear distance have been carried out by using ANSYS.The variation rules of displacement,acceleration and internal forces of control points at secondary lining structure are analyzed,and rules obtained are as follows.Within the three times span of tunnel,the peak displacement and the peak acceleration in horizontal direction enlarge with the expansion of clear distance,but the peak acceleration in vertical direction first decrease and then increase.The peak value of internal force of secondary lining structure decreases with the expansion of clear distance.When the clear distance exceeds 1.5 times of the span,the decreasing trend of the peak value of the internal force becomes slower.The above rules are related to the strain energy stored in the two lining structure during the earthquake,indicating the importance of the clear distance value to the long-span highway tunnel.It is suggested that 1.5 times the tunnel span be taken as the minimum value of the clear distance of the double tunnel.

关 键 词：大跨度公路隧道 地震 动力分析 净距 

分 类 号：U455[建筑科学—桥梁与隧道工程]