考虑脱空深度影响的机场刚性道面工作性能研究

Working Performance of Rigid Airfield Runway Considering Influence of Cavity Depth

为了分析道面脱空深度对跑道安全的影响规律,该文采用有限差分方法开展数值模拟研究,考虑了不同机型、道面尺寸、脱空深度以及脱空面积等因素,共设计了208组工况。基于考虑结构状况指数衰减的道面寿命模型,提出评估脱空对道面使用寿命影响的分析方法。研究结果表明:随着脱空深度的增加,道面弯沉和应力逐步增加,但增长速率越来越缓;脱空深度与脱空面积的影响存在耦联效应,当脱空面积较大时,脱空深度的影响才开始显现。在道面弯沉与应力的影响云图中,均存在非敏感区;提出的道面弯沉速率发展指数与应力发展指数可对脱空的影响趋势进行评价,且随着脱空面积与深度的增加,上述指数均存在峰值区。根据不同荷载、道面结构以及起落架次,绘制了脱空程度与剩余使用寿命影响图,可对脱空的影响进行快速评价与分析,从而保障场道结构安全。

In order to analyze the influence of cavity depth on runway safety,a numerical simulation was carried out using the finite difference method.A total of 208 sets of different working conditions were designed by taking into account factors such as different aircraft types,runway dimensions,and cavity depth and area.Based on the runway life model considering the exponential decay of the structural condition,an analytical method was proposed to evaluate the impact of the cavity on the runway life.The results show that the bending and stress of the runway increase gradually with the increase in the cavity depth,but the growth rate is getting slower and slower.There is a coupling effect between the impact of cavity depth and cavity area,and the impact of cavity depth starts to appear when the cavity area is larger.In the cloud diagram of the influence of runway bending and stress,there is a non-sensitive area.The proposed runway bending rate development index and stress development index can be used to evaluate the influence of the trend of the cavity,and with the increase in the cavity area and depth,the above indexes have a peak area.According to different loads,runway structures,and take-off and landing times,the influence diagrams of cavity degree and remaining service life are drawn,which can quickly evaluate and analyze the influence of the cavity,thus guaranteeing the structural safety of the airfield runway.