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结合某城市地下道路实体工程,对其进行4次观测得到其温度数据,并在此基础之上,根据传热学原理,利用有限元方法对复合式路面的瞬态温度场进行分析。文中考虑了空气辐射换热以及空气对流换热两种交换形式。研究表明:空气温度是影响地下道路路面温度场最为主要的因素,同时对于地下道路而言沥青层对其起到了明显的降温作用。此外,结果还显示了路表温度与水泥混凝土板底的温度差较小,因此在地下复合式路面设计时在对水泥混凝土板设计时不用考虑由温度梯度过大而引起的温度应力。
Combined with the physical engineering of an underground road in a city, the temperature data are obtained by four observations. Based on this, the transient temperature field of the composite pavement is analyzed by the finite element method based on the heat transfer theory. In this paper, two kinds of exchange modes, air radiation heat transfer and air convection heat exchange, are considered. The results show that the air temperature is the most important factor that affects the temperature field of underground road surface, and the asphalt layer plays a significant role in cooling the underground road. In addition, the results also show that the temperature difference between the road surface and the bottom of the cement concrete slab is relatively small, so when designing the underground compound pavement, the temperature stress caused by excessive temperature gradient is not taken into account when designing the concrete slab.