摘要
在地震频发区域修建的交叉隧道,重载列车运行时若遇地震力作用,其隧道结构的动力响应备受关注.论文建立了正交交叉隧道的三维有限差分模型,用激振函数模拟重载列车竖向振动荷载,并输入地震波,以研究重载列车运行与地震力耦合作用下隧道结构的动力响应规律.结果表明:在重载列车振动荷载作用下,上跨隧道振动加速度由大到小依次为隧底、拱脚、拱顶和拱腰,下穿隧道振动加速度由大到小依次为拱顶、拱腰、拱脚和隧底;在重载列车运行与地震力耦合作用下,上跨隧道振动加速度由大到小依次为隧底、拱顶、拱脚和拱腰,下穿隧道振动加速度由大到小依次为拱顶、拱腰、拱脚和隧底;重载列车运行与地震力耦合作用下相比仅受重载列车运行条件作用时,交叉隧道结构动力响应相对更为显著.
In the crossing tunnels built in the areas of frequent earthquakes,the dynamic response of the tunnel structure of the heavy-haul train under the action of earthquake force has attracted much attention.In this paper,a three-dimensional finite difference model of orthogonal crossing tunnel is established.The vertical vibration load of heavy-haul train is simulated by using excitation function,and the earthquake wave is input,so as to study the dynamic response law of tunnel structure under the coupling action of heavy-haul train operation and earthquake force.The results show thatunder the action of heavy-haul train vibration load,the vibration acceleration of the upper span tunnel is ranked from the tunnel bottom,arch foot,arch roof to tunnel waist,in order from large to small;the vibration acceleration of the lower span tunnel is ranked from the tunnel bottom,arch waist,arch foot to tunnel bottom,in order from large to small.Under the coupling effect of heavy-haul train operation and earthquake force,the vibration acceleration of the upper span tunnel is ranked from the tunnel bottom,arch top,arch foot to tunnel bottom in order from large to small,and the vibration acceleration of the lower span tunnel is ranked from the arch top,arch waist,arch foot to tunnel bottom in order from large to small.The dynamic response of the crossing tunnel structure is more remarkable under the coupling action of heavy-haul train operation and earthquake force than under the operation condition of heavy-haul train only.
作者
杨博
李成献
董捷
仲帅
YANG Bo;LI Cheng-xian;DONG Jie;ZHONG Shuai(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou,Hebei 075000;Hebei Key Laboratory for Diagnosis,Reconstruction and Anti-disaster of Civil Engineering,Zhangjiakou,Hebei 075000)
出处
《河北建筑工程学院学报》
CAS
2019年第1期38-43,共6页
Journal of Hebei Institute of Architecture and Civil Engineering
关键词
交叉隧道
重载列车
地震力
动力响应
crossing tunnel
heavy-haul train
earthquake force
dynamic response
