沥青路面典型结构Top-Down裂缝尖端应力强度因子影响因素分析

Study on Top-Down Crack Tip Stress Intensity Factor in Typical Asphalt Pavement

借助ABAQUS有限元平台,分析水泥稳定碎石基层沥青路面与粒料基层沥青路面,TopDown裂缝尖端应力强度因子KII随路面结构参数、轴载及裂缝深度变化规律。结果表明,增加沥青层厚度与模量、基层厚度与模量、土基模量对沥青路面结构抑制Top-Down裂缝有益,而超载将对路面Top-Down裂缝产生严重不利影响;水泥稳定碎石基层沥青路面抗Top-Down裂缝能力大于粒料基层沥青路面。

Based on finite element program ABAQUS,the Top-Down crack tip stress intensity factor KII was analyzed with different pavement structure parameters,axle loading and crack depth when the pavements were the asphalt pavement with cement treated granular base and the asphalt pavement with granular base.It was found that,with the increase of asphalt layer thickness and modulus,the base thickness and its modulus and the subgrade modulus,the Top-Down crack tip stress intensity factor decreased.Overload of the vehicle axles made negative effects on Top-Down crack.Through comparison,it was found that,the asphalt pavement with cement treated granular base has more anti-crack ability than the asphalt pavement with granular material base.