多机型影响下跑道结构层动态响应分析

Analysis on Dynamic Response of Runway Structure Layers Under Multiple Aircraft Types’ Impact

基于丹佛机场跑道5年实测动态响应数据,分析多机型滑行时道面板边板角的应变和位移特征,对跑道各结构层多年压缩变形规律进行分析。结果表明,对于不同起落架构型的飞机,道面应变峰值与主起落架轮轴数量对应。混凝土道面板动态应变峰值随运营年限增加变化较小,主要与实测机型有关。对于B737机型,板底受拉应变小于板顶受压应变;而B747、B777机型,板底受拉应变大于板顶受压应变,说明大飞机对混凝土道面损伤更为严重。基层动态位移响应在跑道各结构层中是最为敏感的,压缩变形波动比较剧烈,压缩率最大;而垫层、土基压缩变形量和压缩率随运营年限逐渐趋于稳定。因此建议机场跑道在设计和施工时,对板角和板边部位基层进行重点处理。

Based on the measured dynamic response data of the runway of Denver International Airport for five years,this paper analyzes the characteristics of strain and displacement at the corner and the edge of pavement under taxiing state of various types of aircraft,and further analyzes the law of compression deformation of the concrete pavement surface in different runway structural layers for many years. The results show that the peak strain of the pavement surface corresponds to the number of main landing gear axles for the aircraft with different landing gears.The dynamic strain peak of the concrete pavement changes little with the increase of the operating period,which is related to the type of aircraft. For the B737 aircraft,the tensile strain at the bottom of the pavement is less than the compressive strain at the top of the pavement,but the tensile strain at the bottom of the pavement is greater than the compressive strain at the top of the pavement for the B747 and B777 aircraft. These indicate that the damage of the concrete pavement caused by large aircraft is more serious. The dynamic response of the base layer is the most sensitive among the structural layers of the runway. The compression deformation fluctuates violently and the compression rate is the largest,while the compression deformation amount and compression rate of the subcrust and foundation tend to be stable with the operating period. Therefore,it is suggested that the corner and edge of the pavement should be mainly treated during the design and construction of airport runway.