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通过对我国中部山区复杂地形地质条件下高速铁路桥隧过渡段无砟轨道钢轨和道床板纵向温度分布的连续观测,得到桥隧过渡段钢轨和道床板的纵向温度分布规律,并提出适用于春季的桥隧过渡段钢轨和道床板纵向温度梯度荷载模式.结果表明:从隧道外到隧道内,钢轨温度变化幅值不断减小,隧道内75 m处的钢轨温度峰值出现时刻比隧道外22 m处的滞后4 h;钢轨纵向温度随隧道径深增加变化最大的位置位于0~8 m区间,隧道深75 m以后,钢轨的温度变化幅度明显变小,基本稳定在0.2℃;道床板纵向温度随隧道径深增加变化最大的位置位于0~8 m区间,隧道深25 m以后,道床板的温度变化幅度明显变小,基本稳定在1.7℃;一天中钢轨和道床板温度沿纵向变化幅度最大的时刻出现在14:00~16:00;纵向温度梯度模式可分为钢轨和道床板两类,钢轨和道床板纵向温度梯度均可采用分段函数进行拟合.
Through the continuous observation of the longitudinal temperature distribution of ballastless track and ballast bed in the transitional section of high-speed railway bridge and tunnel under the complex terrain and geological conditions in the central mountainous area of China, the longitudinal temperature distribution of the rail and ballast bed in the transitional section of the bridge and tunnel was obtained. The results show that the rail temperature changes continuously from the outside of the tunnel to the inside of the tunnel and the peak temperature of the rail at 75 m in the tunnel appears more than the outside of the tunnel for 22 m And the lagging time of the rail is 4 h. The position where the longitudinal temperature of rail changes most greatly with the increase of the tunnel depth is located in the interval of 0-8 m. After the tunnel is 75 m deep, the temperature variation range of the rail becomes smaller and basically stable at 0.2 ℃. When the tunnel depth is 25 m, the temperature change of the bed slab obviously decreases, which is basically stable at 1.7 ℃. The temperature of the rail and bed slab in the day changes most longitudinally in the range of 0 ~ 8 m. Of the time in 14: 00 ~ 16: 00; longitudinal temperature gradient mode can be divided into two types of rail and rail bed, rail and rail bed longitudinal temperature gradient can be used piecewise function Co.