列车荷载作用下邻近粤海铁路桩基动力响应研究  

Study on the Dynamic Response of Pile Foundation Under Train Load near Guangdong-Hainan Railway

作　　者：郭立富[1] GUO Lifu(China Railway 18th Bureau Group First Engineering Co.,Ltd.,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《国防交通工程与技术》2024年第2期36-40,共5页Traffic Engineering and Technology for National Defence

摘　　要：以粤海铁路某跨线桥为例,使用有限差分软件建立三维模型,对不同列车时速、扩底直径、扩底桩与铁路距离的多工况进行计算,分析列车荷载作用下邻近扩底桩的动力响应规律。研究结果如下:随着车速增加竖向与水平动应力峰值增大,桩顶加速度对列车速度变化最为敏感;与列车速度相比桩端直径改变对动应力峰值的影响更大,改变扩底直径的桩基抗震加固方法具有可行性;随着与铁路距离的不断增加,扩底桩加速度峰值衰减明显,需对靠近铁路20 m范围桩进行重点抗震加固。研究结论为桩基结构设计提供了依据。In the engineering context of a cross-line bridge of Guangdong-Hainan Railway,this article analyzes the effects of different train speeds,spreading diameters,and distances between the spread-bottom piles and the railway on the dynamic response of adjacent spread-bottom piles under train loads using finite difference software.The main conclusions are as follows:when the train speed increases,the peak vertical and the horizontal dynamic stress increases;the acceleration of the pile top is the most sensitive to the change of the train speed;the change of the diameter of the pile end has a greater effect on the peak dynamic stress compared with the train speed,and the seismic reinforcement of the pile foundation by changing the diameter of the spreading bottom is feasible;the peak acceleration of the spreading bottom pile decreases with increasing distance from the railway,and it is necessary to carry out key seismic reinforcement within 20-meter range near the railway.The research conclusion provides a basis for the design of pile foundation structures.

关 键 词：列车荷载 邻近桩基 动力响应 现场监测 数值模拟 

分 类 号：U413.15[交通运输工程—道路与铁道工程]