柔性基层路面结构在渝湛高速公路中的应用

最新成果表明,半刚性基层的刚度过大,直接造成了沥青混凝土面层内的剪应力急剧增加,诱发沥青混凝土层的剪切破坏,解决这一问题的途径在于沥青混凝土面层和半刚性基层应具有合理的模量匹配。在渝湛高速公路的建设中,采取了柔化半刚性基层的方法,即合理地降低基层的模量。为进一步了解柔性基层路面结构内各结构层的力学响应,采用三维有限元法,对实测轮胎接地荷载下柔性路面结构内的应力场进行了深入的分析。分析表明,柔性基层更有利于避免路面的早期破坏。

Application of Pavement Structure with Flexible Base to Yu-Zhan Expressway

According to recent research,the too great stiffness of semi-rigid layer will cause the shear stress sharply increase in the asphalt layer and the related shear failure.The appropriate modulus ratio between asphalt layer and semi-rigid layer is the only way to solve this problem.During the construction of Yu-Zhan Expressway,the modulus of base layer is rationally reduced.In order to deeply understand each layers mechanical response,the 3D FEM is used to analyze the stress field under the actual tie contact pressure in the asphalt pavement structures.The results show that the flexible base is more advantageous to avoid the early damages of pavement.