【摘要】 水和行车荷载共同作用下,沥青路面结构内部将产生动水压力。为了解随荷载作用变化的动水压力对透水沥青路面结构内部初始裂缝扩展的影响,基于ABAQUS有限元方法和线弹性断裂力学原理,引入裂纹尖端奇异单元,考虑不同的初始裂缝长度,对水和行车荷载共同作用下透水沥青路面结构内部裂缝尖端附近应力场和位移场进行分析,计算相应的张拉型和剪切型应力强度因子。结果表明:水的存在改变了透水沥青路面结构内部的应力场,对荷载作用下沥青面层裂缝的张拉型和剪切型扩展有一定的影响,但由于透水沥青路面结构具有良好的排水性能,可以有效地缓解动水压力对沥青面层已有裂缝的劈裂作用。更多还原

【Abstract】 Under the coupled water and vehicle load,hydrodynamic pressure will be generated inside the asphalt pavement structure,in order to understand the effect of hydrodynamic pressure on the initial crack propagation in the permeable asphalt pavement structure,based on ABAQUS finite element method and linear elastic fracture mechanics principle,introduction of crack tip singular unit,consider different lengths of initial fractures,analyze the stress field and displacement field near the crack tip in the structure of permeable asphalt pavement under the coupled water and vehicle load, calculate corresponding tensile and shear stress intensity factors. The results show that the existence of water changes the stress field inside the permeable asphalt pavement structure,there is a certain influence on the tensile and shear type expansion of asphalt surface cracks under load,due to the good drainage performance of permeable asphalt pavement,it can effectively relieve the splitting effect of hydrodynamic pressure on the existing crack in asphalt surface.更多还原