关键词: 道路工程, 非均布移动荷载, 有限层模拟, 沥青路面, 动力响应

Abstract: Based on moving characteristics of the measured non-uniform vehicle load，the dynamic shear modulus of Witczak viscoelastic model was used to establish a three-dimensional finite layer model of asphalt pavement with transient dynamic analysis under non-uniform moving load.The change of time course and the lateral distribution discipline of asphalt pavement dynamic response were analyzed by using 3D-MOVE Analysis software in the cases of different pavement temperature and different vehicle velocity.The above results were compared with the computation results of uniform moving loads.The results show that： the dynamic response of pavement structure has alternating characteristics； base and subgrade strain recovery occur hysteresis phenomenon； the top of surface layer shows stress strain concentration； the transverse distributions of pavement dynamic response exhibit asymmetry in wheel loading area，and the transverse distributions of the maximum dynamic response are different； compared with dynamic response under uniform moving load，the dynamic response under non-uniform moving load has smaller change along the transverse direction； with the increase of the vehicle speed，the dynamic response of surface bottom decreases firstly and then increases，there is a peak point，the critical speed is about 48 km/h； as the pavement temperature increases from -10 ℃ to 50 ℃，the longitudinal strain and transverse strain of surface bottom increases by 2.75 times and 1.53 times respectively； the shear stress of surface bottom increases significantly，and the shear stress of surface bottom is prone to stress concentration below high temperature.

Key words: highway engineering, non-uniform moving load, the finite layer simulation, asphalt pavement, dynamic response0引言