半刚性基层与ATB柔性基层沥青路面力学响应和寿命预测OA

To investigate the service life of flexible-base asphalt pavements,this study compares the mechanical responses and service lives of an ATB-40 flexible-base asphalt pavement with those of a conventional semi-rigid-base asphalt pavement.The results show that the ATB-40 flexible base significantly reduces the tensile stress at the bottom of the semi-rigid layer:for a semi-rigid sub-base plus ATB configuration the stress is only 0.105 MPa,whereas the traditional semi-rigid base reaches 0.186 MPa.The overall fatigue life of the ATB-40 system outperforms that of the semi-rigid base;the fatigue life of the semi-rigid sub-base plus ATB structure attains 2.21×1011 strain cycles,far exceeding the 5.96×108 strain cycles of the conventional semi-rigid structure.Moreover,the ATB-40 system is sensitive to thickness increases,and thickening yields remarkable benefits.The ATB-40 flexible structure with a semi-rigid sub-base effectively eliminates the risk of reflective cracking and substantially extends the pavement service life.