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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第13卷    第9期    总第78期    2016年9月

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文章编号:1672-7029(2016)09-1789-07
列车荷载作用下重叠隧道结构动力响应分析
林志鹏

(福建省第一公路工程公司,福建泉州 362000)

摘 要: 随着交通运输需求的急剧增长,重叠隧道结构工程逐渐增多,列车荷载对重叠隧道结构的影响越来越突出。基于有限元时程分析,研究列车振动荷载作用下城际隧道建设前、建成后及运营期间等不同条件下隧道结构的动力响应,得出隧道结构在列车振动荷载作用下的隧道结构动力响应规律。研究结果表明:地铁和城际列车荷载共同作用下隧道结构动力响应最大,城际列车荷载次之,地铁列车荷载最小;相同荷载作用下,结构形式不同也会使得隧道结构动力响应存在一定的差异,单层双跨结构动力响应最大,单层单跨结构次之,双层双跨结构最小;隧道结构加速度峰值主要受结构覆土层厚度的影响,荷载类型及结构形式对其影响较小。

 

关键字: 列车动荷载;重叠隧道结构;动力响应;阻尼;时程曲线

Analysis on dynamic response of overlapped tunnel structure under vibration load
LIN Zhipeng

The First Highway Engineering Company in Fujian Prorince, Quanzhou 362000, China

Abstract:With the rapid increase of traffic demand, the structure of overlapped tunnels is increasing, and the influence of train load on overlapped tunnel structure is becoming more and more serious. Based on finite element time history analysis, the dynamic response of the tunnel under different conditions, such as the pre-construction of the train vibration load, is studied. The dynamic response of the tunnel structure under the action of the train vibration load is obtained. Research results show that: The dynamic response of the tunnel under the combined action of subway and inter-city trains is the largest. The train load is the second, and the load of subway train is the smallest; Under the same load, the structural form of the structure will make the dynamic response of the tunnel where there is a certain difference. The dynamic response of single layer and double span structure is the largest, and single span and single span structure is the second, and double cross structure is the minimum. The peak value of the acceleration of the tunnel structure is mainly affected by the thickness of the overlying soil layer, and the influence of the load type and structure form is small. The research results have good practical value for the design of overlapped tunnel structure.

 

Key words: the train dynamic loads; overlapped tunnel structure; the dynamic response; the rayleigh damping; the time-history curve

ISSN 1672-7029
CN 43-1423/U

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