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为提高半刚性基层沥青路面层间抗剪强度以及抵抗永久变形的能力,充分发挥其使用功能,基于黏弹性力学理论,应用有限元方法研究周期荷载作用下沥青路面层间剪应力分布情况以及路面永久变形发展规律.结果表明,沥青面层的黏弹性有利于面层间剪应力的松弛,但会增大基面层间剪应力;动载的卸载回复作用导致层间剪应力峰值随时间变化率小于静载下的相应值;轮缘外侧的隆起变形较轮隙处的小,下面层的永久变形较上面层的大;轮隙处和轮心处均在上面层以下某处出现最大蠕变应变值,但轮隙处出现最大蠕变应变值的深度较轮心处的大.因此,路面设计必须对半刚性基层和沥青面层的层间黏结性能,以及下(中)面层抵抗永久变形的能力给与足够的考虑.
Based on the theory of viscoelasticity, the finite element method is used to study the shear stress distribution of asphalt pavement under cyclic loading and the influence of pavement shear stress on asphalt pavement to improve the shear strength and resistance to permanent deformation of semi-rigid base asphalt pavement. The results show that the viscoelasticity of asphalt pavement is conducive to the relaxation of shear stress between the surface layers, but it will increase the interlaminar shear stress; the effect of unloading and reloading of the dynamic load on the interlaminar shear stress peaks changes with time The rate of deformation is smaller than the corresponding value under static load. The deformation of the bulge on the outer side of the rim is smaller than that of the wheel gap, and the permanent deformation of the lower layer is larger than that of the upper layer. However, the maximum creep strain at the wheel gap is greater than the wheel center at the wheel center.Therefore, pavement design must be based on the interlaminar bond properties between the semi-rigid base and the asphalt surface, and the lower (middle) surface resistance Permanent deformation ability given enough consideration.