摘要
本文对列车动荷载一维正弦激振力模型进行修正,使其适合350km/h以上高速列车的模拟,并推广到三维模型计算中。以六沾线乌蒙山隧道与新梅花山隧道立体交叉工程为背景,通过数值模拟方法,对隧道立交结构进行列车荷载动力分析。在动力模拟中设定3种不同的立体交叉结构形式,分别为分修、半分修、合修结构,并研究这3种结构形式在列车动荷载作用下位移、加速度、内力的响应规律。分析结果表明,立交框架与挡头墙连接上下隧道的合修结构形式具有较高的安全储备。
T his paper corrected the commonly used one‐dimensional sine excitation force model for train‐induced dynamic loads , to adapt to the simulation of high‐speed train at the speed of over 350 km/h . The model was further extended to three dimensional simulation . On this basis , taking the grade separated junction of Wu‐mengshan Tunnel of Liupanshui‐Zhanyi Railway and the new Meihuashan Tunnel as an example , through nu‐merical analysis , this paper presented an analysis on train induced dynamic load with the grade separated tunnel structure . At the cross point , three different grade separated structure forms , namely , separately built form , half‐separately built form and jointly built form , were established in the dynamic simulation . The response law of displacement , acceleration and internal force of the three structure forms under train‐induced dynamic load was studied . The analysis results showed that the jointly built structure , where the grade separated framework and connecting walls that connect the upper and the lower tunnels , possessed a higher structure safety reserve .
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2015年第6期103-111,共9页
Journal of the China Railway Society
关键词
立体交叉隧道
衬砌结构
动力响应
列车动荷载
grade separated tunnels
lining structure
dynamic response
train-induced dynamic load
