车辆荷载对公路隧道结构及围岩动力响应研究  

Study on the dynamic response of vehicle load to highway tunnel structure and surrounding rock

作　　者：张志强 王小敏 Zhang Zhiqiang;Wang Xiaomin(Shanxi Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Taiyuan Shanxi 030032,China;Shanxi Energy College,Jinzhong Shanxi 030600,China)

机构地区：[1]山西省交通规划勘察设计院有限公司,山西太原030032 [2]山西能源学院,山西晋中030600

出　　处：《山西建筑》2024年第4期153-157,共5页Shanxi Architecture

基　　金：山西省交通运输厅科技项目:软岩隧道水渗条件下时效变形破坏机理及长期稳定性评价研究(编号:2016-1-9)。

摘　　要：目前针对大直径盾构公路隧道在车辆随机动荷载作用下的动力响应特性尚缺乏深入研究。以南京长江隧道软土地层段为例,将仿真计算所得车辆随机动荷载施加于隧道有限元模型上,得到了隧道结构和隧道周围土体在随机动荷载作用下的动力响应规律,分析了车速、路面等级与隧道侧边土层等对动力响应的影响。结果表明,极端工况下隧道结构主应力呈对称分布,结构位移由左至右呈递减趋势;对于同一隧道截面,侧边土体动力响应最强,底部土体次之,顶部响应最微弱;土体距管片越远,应力响应峰值出现的时刻越滞后且响应值越小;车速越快、路面等级越差,土体动力响应越强;相同工况下,砂土的振动应力响应值要远大于软土对应值。At present,there is still a lack of in-depth research on the dynamic response characteristics of large-diameter shield highway tunnels under vehicle random dynamic loads.In this paper,the soft soil section of Nanjing Yangtze River Tunnel is taken as an example.The random dynamic load of the vehicle obtained by simulation is applied to the finite element model of the tunnel.The dynamic response law of the tunnel structure and the soil around the tunnel under random dynamic load is obtained.The influence of vehicle speed,pavement grade and soil layer on the dynamic response is analyzed.The results show that the principal stress of the tunnel structure is symmetrically distributed under extreme conditions,and the structural displacement decreases from left to right.For the same tunnel section,the dynamic response of the side soil is the strongest,the bottom soil is the second,and the top response is the weakest.The farther the soil is from the segment,the later the time of the peak stress response and the smaller the response value;the faster the vehicle speed,the worse the road grade,the stronger the dynamic response of the soil;under the same working conditions,the vibration stress response value of sand is much larger than that of soft soil.

关 键 词：软土地层 越江公路隧道 车辆随机动荷载 动力响应 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]