高胎压下机场环氧沥青道面结构动力响应分析

Dynamic Response Analysis of Airfield Epoxy Asphalt Pavement Under High Tire Inflation Pressure

摘要:

新一代飞机（B787和A350/380）轮胎充气压力普遍达到了1.5 MPa，这进一步加剧了重载高胎压对沥青道面结构响应的影响，而热固性环氧沥青混合料因其优异的力学性能成为重载高胎压条件下的理想选择.基于ABAQUS建立了考虑竖向接触应力不均匀分布的机场环氧沥青道面结构动力响应三维有限元模型，并利用现场足尺加速加载试验结果对模型进行了验证.在此基础上，就接触应力分布、轮胎充气压力大小、温度场分布和道面结构材料特性等因素对道面结构响应的影响进行了分析.结果表明：不均匀接触应力增大了道面结构响应量；重载高胎压条件下，从减少车辙和开裂的角度而言，环氧沥青铺装材料较沥清玛蹄脂混合料具有更好的适用性，但要注意防止中、下面层的塑性变形累积和环氧沥青层底的弯拉疲劳开裂.

Abstract:

The aircrafts of new generation, like Boeing 787 and Airbus 350/380, have tire inflation pressure up to 1.5 MPa, which increases the effects of aircrafts with heavy gross weights on pavement response. The epoxy asphalt pavement becomes an ideal choice due to its excellent mechanical properties. A 3D finite element model of airfield epoxy asphalt pavement under nonuniform moving aircraft tire loads was established by ABAQUS and it was validated with field measurements of accelerated pavement test. The effects of tirepavement contact stress distribution, tire inflation pressure, different temperature profiles and material characteristics were discussed with the finite element model. The results indicated that nonuniform distribution of tirepavement contact stress increased pavement strains; epoxy asphalt pavement was a better choice in terms of decreasing rutting and cracking under heavy aircraft loads; however, fatigue cracking of the bottom of epoxy asphalt layer and permanent deformation of the AC layer should be emphasized.