中文摘要：

采用颗粒流程序建立了ATB-30下面层细观模型,模拟了施工时车辆荷载作用下ATB-30下面层的受力特性,追踪了标准轴载作用下ATB-30颗粒间接触力的演化及不同位置处颗粒的位移,比较了ATB-30与AC-20颗粒间接触力细观响应的差异.结果表明：颗粒间接触力的大小、延伸方向各异,较大的接触力出现在大颗粒间,施加荷载前颗粒间最大接触力为7.051×10^4N;荷载作用后最大接触力为1.393×10^5N,与未施加荷载相比增加约1.98倍,在轮胎下方接触力分布较密集,接触力较大;沿竖直方向颗粒位移逐渐减小,且轮隙处颗粒位移小于轮胎正下方颗粒,左右轮下方颗粒产生的位移最大差异出现在深度为0.04 cm处,两者相差0.28 mm.

英文摘要：

The mesoscopic model of ATB-30 was established based on particle flow code. The stress characteristics of ATB-30 under vehicle load were simulated during construction. The evolution of contact force and the displacement of particles at different position of ATB-30 particles were tracked.The particle contact forces of ATB-30 and AC-20 were compared. The results show that the contact forces among particles are different with various extension direction. The large force forms among large particles,and the maximum force is 7. 051 × 10^4 N before loading with 1. 393 × 10^5 N after loading. The distribution of force under tires is more intensive with large value. The particle displacement is decreased along the depth direction,and the displacements at two wheel gaps are smaller than those at the middle of wheels. The maximum difference of displacement at the middle of left and right wheels occurs at depth of0. 04 cm with difference of only 0. 28 mm.