摘要
以一座隧道区间道床板上拱离缝为背景,基于高速列车-双块式无砟轨道结构系统空间振动理论,建立了道床板上拱的损伤动力模型,计算了道床板上拱维修前后的车轨系统振动响应。对维修前的轨道结构进行伤损评级,对维修后的轨道结构进行动力学评估,并与维修前进行对比。结果表明:运行速度与列车的安全性有直接关联,道床板上拱在速度300 km/h时振动效应明显,脱轨系数和轮重减载率最大值分别为1.92和0.90;速度为160 km/h时列车脱轨系数与轮重减载率最大值分别下降到0.33和0.51。损伤后的轨道结构伤损评级定为Ⅳ级,建议道床板上拱维修前列车限速160 km/h运行;维修后列车速度为300 km/h时脱轨系数和轮重减载率最大值分别为0.55和0.43,满足高速列车运行安全性和乘坐舒适性要求,且维修后的轨道结构动力学性能远好于维修前。
Taking the slab upwarping and splitting of a tunnel as the background,based on the spatial vibration theory of high speed train-double block ballastless track structure system,the damage dynamic model of slab upwarping was established to calculate the vibration response of train rail system before and after maintenance.The track structure before maintenance was rated,the dynamic evaluation after maintenance was carried out,and compared with that before maintenance.The results show that the running speed is directly related to the safety of the train,the vibration effect of slab upwarping is obvious at the speed of 300 km/h,and the maximum derailment coefficient and wheel load reduction rate are 1.92 and 0.90 respectively.When the speed is 160 km/h,the maximum values of derailment coefficient and wheel load reduction rate decrease to 0.33 and 0.51 respectively.The damage rating of the damaged track structure is set as grade Ⅳ,it is suggested that the train should run at a speed limit of 160 km/h before the maintenance of slab upwarping.When the train speed is 300 km/h after maintenance,the maximum values of derailment coefficient and wheel load reduction rate are 0.55 and 0.43 respectively,which meet the requirements of high speed train running safety and passenger comfort,and the dynamic performance of track structure after maintenance is far better than that before maintenance.
作者
陈利
马斌
陈晓飞
余翠英
CHEN Li;MA Bin;CHEN Xiaofei;YU Cuiying(China Railway No.2 Engineering Group Co.Ltd.,Chengdu 610031,China;School of Science,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道建筑》
北大核心
2021年第7期122-126,共5页
Railway Engineering
基金
国家自然科学基金(51978265,52068028)
江西省教育厅科技资助项目(GJJ190319)
江西省高等学校教学改革研究省级立项课题(JXJG-20-5-30)
华东交通大学博士启动资金项目(452)。
关键词
高速铁路
道床板上拱
数值模拟
双块式无砟轨道
损伤评级
脱轨系数
轮重减载率
high speed railway
slab upwarping
numerical simulation
double block ballastless track
damage rating
derailment coefficient
wheel load reduction rate
