摘要
为研究机动车行车动荷载对地下综合管廊的影响,以厦门市某浅埋综合管廊为依托,通过建立机动车荷载-土体-管廊结构数值分析模型,结合现场实测数据,研究机动车动荷载在地基中的传递规律及对综合管廊的影响特征,然后以管廊的跨度、埋深、断面舱数、地质条件和行车动荷载大小等为主要参数,进行综合管廊振动影响特征的参数敏感性分析;最后进行机动车荷载下管廊疲劳寿命的预测。研究结果表明:实测表明管廊在拱顶的振动速度比侧墙位置的振动速度大,振动峰值达0.041 cm/s,振动主频为11.3 Hz,根据实测结果确定计算模型的车辆负荷为八轮20 t重型汽车;管廊跨度对振动速度影响较大,跨度越大,其竖向振动速度峰值和波动幅度也越大,当管廊跨度取3、4、5 m时,拱顶竖向振动速度分别为0.007、0.06、0.14 cm/s;车辆移动荷载引起的土体振动速度在路面接触点附近最大,并随着深度的增加不断衰减,同时管廊结构的存在对土体振动速度的传播起到了一定的阻隔作用;地层性质变化时,拱顶小主应力(受拉)和侧墙大主应力(受压)的峰值则随地层土体性质变化而有显著变化,变化幅度达63.5%,可见地层土体性质对管廊结构主应力峰值影响很大。管廊的疲劳破坏主要受拉应力控制,浅埋条件下,管廊埋深越大,拱顶所受拉应力越大,其疲劳寿命不如埋深浅的情况;三舱管廊相对于单舱管廊的寿命要长。论文的成果可供类似工程的设计提供理论参考。
In order to study the influence of the dynamic load of the motor vehicle on the underground comprehensive pipe gallery,based on a shallow buried comprehensive pipe gallery in Xiamen,the paper establishes the numerical analysis model of the vehicle load soil pipe gallery structure,and combines the field measurement data to study the rules of the dynamic load transfer of the motor vehicle in the foundation and the influence characteristics of the corridor.Then,the span,buried depth,the number of cross section cabins of the tunnel are analyzed.The sensitivity analysis of parameters of vibration characteristics of the comprehensive pipe gallery is carried out with geological conditions,driving dynamic load and so on.Finally,the fatigue life of the pipe gallery under the load of motor vehicles is predicted.The results show that the vibration speed of the pipe gallery is higher than that of the side wall,the peak vibration value is 0.041 cm/s and the main frequency is 11.3 Hz.According to the measured results,the vehicle load of the model is 8-wheel 20 t heavy vehicle.The span of pipe gallery has a great influence on the vibration speed,the larger the span,the greater the peak and amplitude of vertical vibration velocity.When the span of pipe gallery is 3 m,4 m and 5 m,the vertical vibration velocity of arch roof is 0.007 cm/s,0.06 cm/s and 0.14 cm/s respectively.The vibration velocity of soil caused by vehicle moving load is the largest near the contact point of the road surface,and it decreases with the increase of depth.At the same time,the existence of pipe gallery structure plays a certain blocking role in the propagation of soil vibration speed.When the stratum property changes,the peak value of small main stress(tension)and large main stress(compression)of side wall changes significantly with the change of soil properties of the formation,with the change range of 63.5%.It can be seen that the soil properties of the formation have a great influence on the peak stress of the pipe gallery structure.The fatigue fail
作者
施有志
阮建凑
林树枝
薛宏伟
SHI Youzhi;RUAN Jiancou;LIN Shuzhi;XUE Hongwei(School of Civil Engineering and Architecture,Xiamen University of Technology,Xiamen 361024,China;Xiamen Transportation Bureau,Xiamen 361001,China;China Communications Construction Third Harbor Engineering Co.,Ltd.,Branch,Xiamen 361003,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2022年第3期62-71,共10页
Earthquake Engineering and Engineering Dynamics
基金
厦门市建设科技计划项目(XJK-2021-9)
福建省自然科学基金项目(2022J01130362)。
关键词
机动车动荷载
地下综合管廊
振动监测
数值模拟
敏感性分析
疲劳寿命预测
dynamic load of motor vehicle
underground utility tunnel
vibration monitoring
numerical simulation
sensitivity analysis
fatigue life prediction
