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.%Mountainous railway lines, represented by the Fujian-Jiangxi section of Beijing-Fuzhou passenger dedicated line, have features like strong solar radiation, changeable climate and complex terrain and geological conditions and they normally have a large number of bridges and tunnels.In view of the environmental and structural features of mountainous high-speed railway bridge-slab track system, the box girder-slab track temperature field test, rail nonlinear temperature distribution test of bridge-tunnel transition section and bridge-double block slab track dynamic response test under the action of the train were carried out. Result shows that: considering the temperature field distribution of the box girder-slab track is nonlinear, the box girder roof temperature gradient can be fitted to exponential function and the bottom temperature gradient to linear function based on China's railway specification; there is a large temperature difference in the rail longitudinal direction of bridge-tunnel transition section, and the temperature amplitude can be up to?5~21℃; the structural vertical acceleration caused by train operation reduces in turn from rail, track slab, track bed slab to the bridge deck, and energy dissipation effect of track structure is obvious.
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