闽南地区冬季隧道复合式路面结构温度分布规律研究

Study on Distribution Law of Temperature at Tunnel Composite Pavement Structure in Southern Fujian in Winter

基于闽南地区隧道工程项目实例,运用有限元软件分析了冬季条件下隧道复合式路面结构的温度分布规律。研究结果表明:随着洞内纵向深度和路面结构深度的增加,各结构层温度日变化幅度逐渐减小,变化相位有滞后现象,洞口与洞内90 m处沥青面层表面温度日变化幅度相差6.51℃,结构深度36 cm处日温度最低时刻滞后2小时,洞口处沥青面层表面与结构深度36 cm处温度日变化幅度相差8.03℃,日最低温度滞后10小时;路面结构温度随隧道纵向深度变化分成洞口不稳定段和洞内稳定段,且随着结构深度的增加,洞内温度不稳定段长度逐渐减小,沥青面层表面与结构深度36 cm处不稳定段长度分别为30,20 m,长度减小10 m。

Based on the project case of tunnel engineering in Southern Fujian,the distribution law of temperature at the tunnel composite pavement structure in winter was studied with finite element software.The result of the research shows that,with the increase of the longitudinal depth of the tunnel and the depth of the pavement structure,the daily variation of the temperature at each structural layer decreases gradually,and there exists hysteresis phenomenon on the phase change;the daily variation of the surface temperature at the asphalt covering at the entrance and the position 90 m inside the tunnel differ by 6.51℃,and the daily minimum temperature at the position 36 cm deep in the structure lags behind by 2 h;the daily temperature variation of the asphalt surface at the entrance and of the position 36 cm deep in the structure differ by 8.03℃,and the daily minimum temperature lags behind by 10 h;the pavement structure is divided in term of the temperature into unstable section at the entrance and stable section in the tunnel with the longitudinal depth of the tunnel and,as the structural depth increases,the length of unstable section in the tunnel decreases gradually;the length of unstable sections of the asphalt surface and the position 36 cm deep are 30,20 m respectively,reducing by 10 m.