适应大型飞机的机场半柔性道面的力学数值分析

Mechanics Numerical Analysis of Semi-flexible Compound Pavement for Large Aircraft

目前国内机场道面主要为水泥混凝土道面、较少的沥青混凝土道面,而半柔性道面在国内机场尚未得到应用。为了研究此类道面的实用性,研究了半柔性道面在具有复杂起落架的大型飞机多轮荷载下的力学响应规律。基于A380飞机,运用ANSYS,建立道面结构模型,在4轮、6轮、10轮、12轮、16轮和20轮荷载组合下进行结构的分析,获取应力、应变、弯沉的变化。经分析得出,多轮荷载组合下存在明显的叠加效应;6轮荷载组合是结构设计中的最不利组合;应多指标控制道面结构分析:以6轮荷载组合控制面层应变、基层应力、底基层应力,以10轮荷载组合控制土基顶面竖向应变,以16轮荷载组合控制弯沉。

Now domestic airport pavements are mainly cement concrete pavement and asphalt concrete pavement,but semi-flexible compound pavement has not been applied at domestic airport pavements. To research its practical applicability,the article studies mechanical response of semi-flexible compound pavement under multiple-wheel loads of large aircraft with complex undercarriage. Based on A380,it builds the model of pavement structure and analyses pavement structure under loading combinations（ four wheels; six wheels; ten wheels; twelve wheels; sixteen wheels; twenty wheels）,so that getting the response of stress、strain、deflection by ANSYS. Drawing the following conclusions： semi-flexible compound pavement has obviously the overlay effect under the effect of multi-wheel loads; pavement structural design use six wheels group as the least favorable loading combinations; It is necessary to use multi-index to control analysis of pavement structure： controling surface strain、stress of the base、stress of the subbase by six wheels group,vertical compressive strain on the top of roadbed by ten wheels group,deflection by sixteen wheels group.