水泥路面板高温隆起的力学机理分析

为了避免或延缓水泥路面板在夏季产生高温隆起现象,从力学机理的角度,探讨了水泥路面板在夏季高温隆起的原因,并举例计算水泥路面板板顶与板底全年最大的应力差及水泥路面板压曲临界应力。结果表明,仅从强度的角度来看,如胀缝设置不当,则旧水泥路面板在夏季都是危险的;如果胀缝功能得不到保证,厚度26 cm左右的水泥路面板,在夏季出现隆起的临界板长约为85 m。因此,建议在南方地区,对于4级及4级以下公路(特别是低造价的农村公路)广泛采用的素混凝土或低配筋混凝土路面,胀缝按80 m间距来设置是适宜的。

Analysis of Mechanical Behavior of Pavement Slab Humping by High Temperature

In order to avoid or delay the phenomenon of pavement slab humping by high temperature in summer,from the point of view of mechanical behaviors,the reason of pavement slab humping by high temperature in summer was discussed and the most stress difference between tops and bottoms of pavement slabs over a year and the critical stress of buckling of pavement slabs were calculated by giving an example.The results show that(1) only from the point of view of strength,if expansion slots were set improperly,old pavement slabs in summer would be in danger;(2) if functions of expansion slots were not guaranteed,the critical humping length of pavement slab about 26 cm in thickness would be about 85 m in summer.Therefore,it was suggested that in the south area it would be suitable that the distances between two expansion slots should be 80 m for pavement slabs constructed by pure concrete or light reinforcement concrete,which is widely adopted by fourth class or under fourth class highways(such as village highways constructed by lower cost).