摘要
通过现场实测和数值计算分析了30 t轴重列车荷载作用下,不同铺底厚度和基底不同吊空程度时红岭重载铁路隧道铺底结构的动力响应特征。结果表明:铺底结构能较好地吸收列车振动荷载,并且随着铺底厚度增大,铺底结构的竖向动应力和竖向加速度均减小,因此设计和施工过程中须保证铺底结构具有足够厚度;随着基底吊空程度增大,铺底结构的动力响应逐渐加剧,并且铺底结构底面的竖向位移和竖向加速度变化比顶面更加显著。
Through field measurement and numerical calculation,the dynamic response characteristics of Honglingheavy haul railway tunnel bedding structure with different thicknesses of the bedding and different degrees of thebasement hoisting under the action of 30 t train axle load were analyzed. The results show that the bedding structure canabsorb the train vibration load well,and the vertical dynamic stress and vertical acceleration of the bedding structuredecrease with the increase of the bedding thickness,which means that sufficient thickness of the bedding structure shallbe ensured during design and construction process. The dynamic response of the bedding structure is graduallyintensified with the increase of the basement hoisting degree,and the vertical displacement and vertical accelerationchange of the bedding structure bottom surface is more significant than that of the top surface.
作者
邓斌
乔春生
余东洋
陈松
DENG Bin;QIAO Chunsheng;YU Dongyang;CHEN Song(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2019年第10期75-79,共5页
Railway Engineering
基金
国家自然科学基金(51478031)
中央高校基本科研业务费专项经费资助(144484522)
关键词
重载铁路
动力响应
数值计算
现场试验
铺底结构
基底吊空
heavy haul railway
dynamic response
numerical calculation
field test
bedding structure
basement hoisting
