With reference to Houanshan tunnel engineering in cold region, the temperature distribution of lining, surrounding rock and the vertical temperature distribution are analyzed with the test of temperature field in the test section and the effect of thermal insulation board is addressed. The results show that:(1) the changes of side wall, arch waist, crown point at each site tend to be a sine function over the time and go synchronously with the outside air temperature; temperature changes dramatically within 60 cm from the lining surface; within 3 m radial range, the temperature of surrounding rock changes linearly;relatively stable temperature boundary condition exists in the radial surrounding rock; after tunnel holing-through, the temperature of each test point drops by 3 ℃; ( 2 ) the longitudinal temperature field along the route is distributed in the pattern of a parabola, which is a downward opening in cold season and just the opposite in warm season; the temperature at 500 m inside the tunnel drops gradually on account of the influence of outside air temperature and the temperature distribution becomes uniform gradually; ( 3 ) the maximum temperature difference between internal side and external side of the insulation board is 9. 21 ℃, indicating good insulation effect of the board. Insulation boards of different thickness are proved cost-effective for use in tunnel insulation section.%以寒区后安山隧道工程为依托,通过对试验段温度场的测试,分析衬砌围岩温度分布规律、洞内纵向温度分布规律,并在此基础上,对保温板的保温效果进行探讨,分析结果表明：(1)边墙、拱腰、拱顶部位各测点随时间的变化规律成正弦函数,并和外界气温同步变化；距离衬砌表面60 cm内温度变化最为剧烈；在径向3 m范围内,围岩内温度呈线性变化趋势；围岩径向存在一个比较稳定的温度边界条件；隧道贯通后,各测点的温度下降3℃左右。(2)隧道纵向温度场沿路线呈抛物线分布,寒季为开口向下的抛物线,暖季则相反；进入隧道500 m后洞内气温受洞外气温的影响逐渐减弱,温度分布也逐渐均匀。(3)保温板内外两侧温度差最大9.21℃,证明其具有良好的保温效果；建议在隧道防寒保温段采取非等厚保温板的铺设方法更为经济合理。
展开▼
