摘要
以内昆铁路疏解线新梅花山隧道和六沾线乌蒙山隧道近距离立体交叉隧道为背景,研究列车运营期间,列车振动对隧道结构的影响。采用激振函数模拟列车竖向振动荷载,并通过对围岩-隧道体系进行模态分析,得到体系的振型和频率,以确定合理的阻尼系数和时间积分步长。最后运用Newmark隐式积分法,分别研究在各种列车荷载工况作用下,立体交叉隧道的动力响应,确定在列车振动荷载作用下衬砌结构的薄弱部位及相应的位移和应力。
Based on small-distance undercrossing tunnel of New Meihuashan Tunnel in extended line and Wumengshan Tunnel in Liupanshui-Zhanyi Line of Neijiang-Kunming Railway,this paper studies the influence of train vibration on tunnel structure during operation.Vertical train vibration load is simulated with excitation function.Then vibration mode and frequency of surrounding rock and tunnel system are obtained through modulus analysis to determine reasonable damping coefficient and time integral step.Finally,dynamic response of undercrossing tunnel is studied under various train loads using Newmark implicate integration method to determine the weak position of lining structure and the corresponding displacement and stress under train vibration load.
出处
《路基工程》
2010年第4期212-214,共3页
Subgrade Engineering
关键词
交叉隧道
动力响应
衬砌结构
列车振动荷载
crossing tunnel
dynamic response
lining structure
train vibration load
