关键词: 半刚性基层, 特征路径, 力学响应, 应力峰值

Abstract: Based on typical construction of semi-rigid asphalt pavement，the three-dimensional dynamic model was built up． Considering four combined load types of standard load，standard load + brake，overload，overload + brake，taking the worst two-wheel contact surface pattern of rectangular section，the analysis method of characteristic path and the numerical simulation method were to analyze the mechanical response law of the surface and the deeper part of the road． The results show that the brake has little impact on the road deflection and compressive strain on top layer，but the effect in the condition of overload is significant． Brake has great influence on the flexural stress on the surface course，and the large tensile force appears in the upper layer． But the brake almost have no influence on the base course，overload greatly increase the flexural stress． Peak of shear stress increases significantly in the condition of overload and brake，especially when brake appears． The place where peak of mechanical response appears changes along the depth of the road surface． We shall choose the corresponding peak as the mechanical index when we design the asphalt pavement and do the mechanical analysis．

Key words: semi-rigid base, feature paths, mechanical response, peak stress