飞机跑道荷载响应深度变化规律

针对目前刚性道面未考虑道面结构参数、起落架机型及滑跑速度与响应深度之间关系的现状，借助ANSYS软件建立45m×15m×10m的有限元模型，计算了8种面层厚度、6种面层模量、5种基层厚度、5种基层模量和5种土基模量下B737-800动荷载的响应深度，并类比另4种机型的计算结果，分析了起落架构型对结果的影响；同时形成了B737-800起飞过程中响应深度的动态变化曲线.研究结果表明，响应深度随面层厚度、面层模量、基层厚度与基层模量的增大呈线性减小趋势，随土基模量的增大而增大，两者关系服从二次函数，且土基模量对响应深度最为敏感；同时起落架构型对响应深度也有较大贡献；飞机起飞过程中，响应深度呈先小幅增加而后迅速减小的非线性变化.研究结果为机场道面结构参数的选取和场道维护提供了理论依据和参考. 

Influencing depth under aircraft loads of runway

In view of the current situation that the relationship among the influencing depth, the pavement structural parameters, the configuration of landing gear and take-off ground speed was not taken into consideration by the present rigid pavement, a finite element model of 45 m×15 m×10 m was built by means of the ANSYS software. The influencing depth of B737-800 under dynamic loads in some conditions with different parameters, including the thickness and modulus of surface and base and soil matrix layers, was calculated. Compared with other 4 aircraft types, the results were used to analyze the influence of the configuration of landing gear. At the same time, the dynamic curve related to the influencing depth during the period of B737-800's take-off was obtained. The results show that the influencing depth decreases linearly with the increase of thickness and modulus of surface and base layers, whereas increases quadratically with the increase of modulus of soil matrix which is most sensitive to the influencing depth. Besides, the configuration of landing gear makes a great contribution to the influencing depth. During the take-off period, the influencing depth changes non-linearly with a slight increase at the beginning and then a sharp decrease. The study provides the theoretical basis and reference to the selection of the structural parameters of pavement and maintenance of pavement in airports.