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Analysis of periodic cracks in surface layer of pavement structures

机译：路面结构表层周期性裂缝分析

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摘要

As a critical issue for the pavement's quality service life, surface cracking of the pavement structure is an ongoing research topic which attracts many researchers. This paper presents a numerical study of the periodic cracks in surface layer of pavement structures based on the FEM method. The formation mechanism of the periodic cracks is analyzed and the evolving process is simulated. A parametric study, including effects of the layer thickness, tensile strength of surface layer and layer elastic modulus on the crack spacing is carried out. The numerical results indicate that the horizontal stress between two adjacent cracks decreases gradually as the crack spacing decreases. The horizontal stress transits from tensile to compressive when the crack spacing decreases to a certain value. Such a stress state transition leads to the periodic array of the surface cracks. The evolving process of the periodic cracks indicates that new cracks infill in sequence between two earlier formed adjacent cracks and the crack spacing decreases in half simultaneously. No more new crack can infill when the crack spacing reaches to a certain value even with the increasing of external load. Numerical simulations also show that the crack spacing is strongly dependent on the surface layer thickness, tensile strength of the surface layer and elastic modulus of the surface layer.
机译：作为路面质量使用寿命的关键问题，路面结构的表面开裂是一个持续不断的研究课题，吸引了许多研究人员。本文基于有限元方法对路面结构表层的周期性裂纹进行了数值研究。分析了周期性裂纹的形成机理，并模拟了其演化过程。进行了参数研究，包括层厚度，表面层抗张强度和层弹性模量对裂纹间距的影响。数值结果表明，随着裂纹间距的减小，相邻两个裂纹之间的水平应力逐渐减小。当裂纹间距减小到一定值时，水平应力从拉伸转变为压缩。这种应力状态转变导致表面裂纹的周期性排列。周期性裂纹的演化过程表明，新裂纹在两个较早形成的相邻裂纹之间依次填充，并且裂纹间距同时减小了一半。当裂纹间距达到一定值时，即使外部载荷增加，也不会再有新的裂纹填充。数值模拟还表明，裂纹间距在很大程度上取决于表面层的厚度，表面层的抗拉强度和表面层的弹性模量。

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