山区高速铁路桥梁-无砟轨道系统关键技术试验研究
发布时间：2019-07-27 14:07
【摘要】：以京福客专闽赣段为代表的山区铁路线路具有太阳辐射强、气候多变、地形地质条件复杂的特点,其桥隧众多。针对山区高速铁路桥梁-无砟轨道系统的环境特征和结构特点,开展箱梁-无砟轨道温度场测试、桥隧过渡段钢轨非线性温度分布测试,以及列车作用下桥梁-双块式无砟轨道动力响应测试。研究结果表明:箱梁及无砟轨道温度场呈非线性分布,可在我国铁路规范的基础上,将箱梁顶板温度梯度拟合为指数函数、将底板温度梯度拟合为线形函数;桥隧过渡段钢轨纵向存在较大温差,温差幅度可达-5~21℃;列车运行引起的结构竖向加速度从钢轨、轨道板、道床板到桥面依次降低,轨道结构耗能作用明显。
[Abstract]:The mountain railway line represented by Beijing Fuke Special Fujian and Jiangxi Province has the characteristics of strong solar radiation, changeable climate and complex topographic and geological conditions, and there are many bridges and tunnels. According to the environmental and structural characteristics of the bridge-ballastless track system of high-speed railway in mountainous areas, the temperature field of box girder and ballastless track, the nonlinear temperature distribution of rail in the transition section of bridge and tunnel, and the dynamic response test of bridge-double-block ballastless track under train action are carried out. The results show that the temperature field of box girder and ballastless track is nonlinear distribution, which can be fitted as exponential function and bottom plate temperature gradient as linear function on the basis of railway code in our country, and there is a large temperature difference in the longitudinal direction of rail in the transition section of bridge and tunnel, and the temperature difference can reach-5 鈮，
本文编号：2520061
[Abstract]:The mountain railway line represented by Beijing Fuke Special Fujian and Jiangxi Province has the characteristics of strong solar radiation, changeable climate and complex topographic and geological conditions, and there are many bridges and tunnels. According to the environmental and structural characteristics of the bridge-ballastless track system of high-speed railway in mountainous areas, the temperature field of box girder and ballastless track, the nonlinear temperature distribution of rail in the transition section of bridge and tunnel, and the dynamic response test of bridge-double-block ballastless track under train action are carried out. The results show that the temperature field of box girder and ballastless track is nonlinear distribution, which can be fitted as exponential function and bottom plate temperature gradient as linear function on the basis of railway code in our country, and there is a large temperature difference in the longitudinal direction of rail in the transition section of bridge and tunnel, and the temperature difference can reach-5 鈮，
本文编号：2520061
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