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公路交通荷载作用下下穿隧道动力响应及安全影响分析 被引量:2

Analysis on Dynamic Response and Safety Influence of Underpass Tunnel under Highway Traffic Load
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摘要 为了研究地铁隧道下穿城市公路时,交通荷载对交叉工程结构的影响,基于某地铁隧道下穿公路工程,通过FLAC3D数值差分软件建立三维有限元模型,以汽车振动荷载公式作为激励输入模型,考虑汽车空间位置变化,通过在公路中线相邻节点施加汽车振动荷载,来分析汽车交通荷载作用下地铁隧道与公路交叉动力响应。综合考虑了汽车在不同交叉净距、不同行车速度、不同载重等影响因素对下穿隧道结构动力响应,并进行安全影响分析。研究结果表明:在汽车荷载作用下,振动加速度、速度、位移时程曲线呈上下波动周期性变化;振动加速度、速度、位移峰值自拱顶到拱脚逐渐衰减;交叉净距越小,行车速度越大,载重越大,振动加速度、速度、位移值越大,对隧道影响越大;根据安全限值,在隧道下穿设计及施工时,合理控制交叉净距、车速及车辆载重及调整下穿段隧道安全支护,保证影响在安全范围内。 In order to study the influence of traffic load on the structure of intersection engineering when subway tunnel underpass urban highway,based on a subway tunnel underpass highway project,a three-dimensional finite element model is established by FLAC3D numerical difference software,and the vehicle vibration load formula is used as the excitation input model.Considering the change of vehicle spatial position,the vehicle vibration load is applied at the adjacent nodes of the highway midline to analyze the dynamic response of subway tunnel highway intersection under vehicle traffic load.The dynamic response of Underpass tunnel structure under the influence of different clear distance,different driving speed,different load and other factors is comprehensively considered,and the safety impact analysis is carried out.The results show that:under the action of vehicle load,the vibration acceleration,velocity and displacement time history curves fluctuate up and down periodically;the peak values of vibration acceleration,velocity and displacement gradually decay from the vault to the arch foot;the smaller the cross clearance is,the greater the driving speed and load;the greater the vibration acceleration,velocity and displacement are,the greater the impact on the tunnel is.According to the safety limit,the during the design and construction of underpass tunnel,the clear distance,speed and vehicle load should be reasonably controlled,and the safety support of underpass tunnel should be adjusted to ensure that the influence is within the safe range.
作者 陈富有 王海龙 张清利 张朋天 CHEN Fu-you;WANG Hai-long;ZHANG Qing-li;ZHANG Peng-tian(Hebei Institute of Architecture and Civil Engineering,Zhangjiakou,Hebei 075000;Beiwang Construction Group Co.,Ltd.,Chengde,Hebei 067000)
出处 《河北建筑工程学院学报》 CAS 2020年第4期39-45,共7页 Journal of Hebei Institute of Architecture and Civil Engineering
关键词 地铁隧道 数值模拟 振动荷载 变形规律 安全影响分析 subway tunnel numerical simulation vibration load deformation law safety impact analysis
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