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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。
The latest results show that the stiffness of the semi-rigid base is too large, a direct result of the sharp increase in asphalt concrete surface shear stress induced shear failure of asphalt concrete layer to solve this problem lies in the asphalt concrete surface and semi-rigid base Should have a reasonable modulus match. In the construction of Yu-Zhan Expressway, adopted a method of softening the semi-rigid base, that is, to reasonably reduce the modulus of the grassroots. In order to further understand the mechanical response of each structural layer in the flexible base pavement structure, the stress field in the flexible pavement structure under the tire ground contact load was analyzed by the three-dimensional finite element method. Analysis shows that the flexible substrate is more conducive to avoiding the early damage to the pavement.