论文部分内容阅读
为了设计复合路面的高黏弹性沥青砂应力吸收层,文中应用ABAQUS建立含裂缝复合路面有限元模型,并在层间设置黏聚接触和库伦摩擦接触来确定应力吸收层的弹性模量和厚度等参数。首先,对比了面层和基层之间非线性接触和完全连续时的面层层底拉应力,验证了非线性接触的必要性和应力吸收层的抗裂效果。然后,在确定高黏沥青砂配合比的基础上,通过室内试验得到沥青砂材料在温度和荷载作用下的最不利拉伸、剪切强度。最后,通过力学响应分析了应力吸收层的弹性模量和厚度取值范围,并与试验结果进行了比较,验证了文中设计的高黏弹沥青砂应力吸收层的合理性。
In order to design the high viscoelastic asphalt sand stress absorption layer of compound pavement, ABAQUS is used to establish the finite element model of composite pavement with cracks, and the visco-elastic contact and Coulomb frictional contact are set between layers to determine the elastic modulus and thickness of the stress absorption layer parameter. First, the non-linear contact between the top layer and the base layer and the bottom layer of the bottom layer are compared. The necessity of the non-linear contact and the anti-cracking effect of the stress absorption layer are verified. Then, the most unfavorable tensile and shear strength of asphalt sand material under temperature and load was obtained by laboratory tests on the basis of determining the mix proportion of high-viscosity asphalt sand. Finally, the elastic modulus and the range of thickness of the stress-absorbing layer were analyzed by mechanical response, and compared with the experimental results to verify the rationality of the stress-absorbing layer of high visco-elastic asphalt sand designed in this paper.