列车运行及盾构下穿掘进对高铁桥墩动力响应数值模拟分析OA
Numerical Simulation Analysis of Dynamic Responses of Bridge Piers and Shield Machines under High-Speed Railway Trains and Shield Tunneling Passing Through
为分析列车高速运行产生的振动与盾构施工振动的叠加效应,及其所引发的新安全挑战,以南京地铁6号线下穿沪宁城际高铁工程为例,通过双向移动线荷载模拟列车运行荷载,建立列车动荷载数值模型,模拟列车动荷载作用下盾构施工全过程来开展桥墩及盾构机的动力响应分析;并通过改变列车运行时速进行敏感性分析.结果表明:高铁桥墩与盾构机振动响应受隧道-桥墩净距与列车速度双重调控,隧-桥净距减小,其振动响应显著增大,增大净距则响应衰减;盾构施工邻近桥下时,桥墩振动速度与加速度随列车时速提升呈非线性加速增长,而盾构机在列车进入桥面阶段振动速度随车速提升呈衰减性增长规律;当盾构机穿越桥墩正下方且列车高速(≥250km/h)过桥时,桥墩振动速度较盾构未施工工况增幅超2倍,且接近安全限值,而列车进入桥面时盾构机振动速度已超安全限值;因此,在盾构穿越桥下的关键施工期,应根据施工位置动态控制列车速度,推荐盾构穿越施工期间高铁运营时速不超过160km/h,该工况下各项指标均满足控制要求,可规避安全风险.
To verify the new safety challenges caused by the superposition effect of the vibration generated by high-speed train operation and the vibration during shield tunneling construction,taking the project of the Nanjing Metro Line 6 passing under the Shanghai-Nanjing Intercity High-Speed Railway as an example,a numerical model of the dynamic load of the train was established by simulating the train running load with a bidirectional moving line load.The dynamic responses of the bridge piers and the shield machine under the train dynamic load during the entire process of shield tunneling construction were simulated.The sensitivity analysis was conducted by changing the train speed.The results show that the vibration responses of the high-speed railway bridge piers and the shield machine are jointly controlled by the clear distance between the tunnel and the bridge piers and the train speed.When the clear distance decreases,the vibration responses significantly increase,and when the clear distance increases,the responses decay.When the shield tunneling construction is close to the bridge,the vibration velocity and acceleration of the bridge piers increase nonlinearly with the increase of the train speed,while the vibration velocity of the shield machine increases in a decaying manner with the increase of the train speed during the stage when the train enters the bridge deck.When the shield machine passes directly under the bridge piers and the train passing speed is over 250 km/h,the vibration velocity of the bridge piers increases by more than twice compared with the condition without shield construction,which approaches the safety limit.Meanwhile,the vibration velocity of the shield machine exceeds the safety limit when the train enters the bridge deck.Therefore,during the critical construction period of the shield passing under the bridge,the train speed should be dynamically controlled according to the construction position.It is recommended that the operating speed of the high-speed railway should not exceed 160 km/h during the shield tunneling construction period.Under this condition,all indicators meet the control requirements and the safety risks can be avoided.
杨平;王玉玺;冯树强;丁宇浩;王加辉
南京林业大学 土木工程学院,南京 210037南京林业大学 土木工程学院,南京 210037中铁三局集团 华东建设有限公司,南京 211106南京林业大学 土木工程学院,南京 210037南京林业大学 土木工程学院,南京 210037
建筑与水利
盾构下穿列车动荷载列车时速动力响应数值模拟
shield tunneling underpasstrain dynamic loadtrain speeddynamic responsenumerical simulation
《三峡大学学报（自然科学版）》 2026 (2)
55-63,9
国家自然科学基金项目(42101127)中铁三局集团科研项目(k23补-5)
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