飞机滑行荷载对跑道桩网复合地基影响的数值分析OA

The pile-net composite foundation can effectively reduce the post-construction settlement in road engineering,and has often been used for ground improvement for runway and apron systems in the airfield of coastal airports in China recently.However,the available research on the pile-net composite foundation is mostly focused on the bearing characteristics before construction,lacking research to quantitatively evaluate the influence of aircraft taxiing loads on the bearing characteristics of the pile-net composite foundation in the runway.Therefore,the parameters such as the thickness of the fill layer,the spacing between piles,and the type of aircraft were changed.In addition,based on the dynamic load influence coefficient,the differential settlement ratio after construction,and the degradation coefficient of soil arch,the finite element software ABAQUS was used,and a numerical analysis of the mechanical deformation characteristics of the pile-net composite foundation in the runway under the influence of aircraft taxiing load was conducted.The influence of aircraft taxiing load on the bearing and settlement characteristics of the pile-net composite foundation in the runway was quantified.The results show that when the thickness of the fill layer decreases from 4.5 m to 1.5 m,the soil arching effect is weakened by about 3.3%to 15.1%.When the spacing between piles decreases from 6d to 3d,the soil arching effect is weakened by about 7.8%to 12.0%.The differential settlement ratio after construction at the location of the soft soil layer may exceed the recommended value of the code.As the fill layer becomes thinner,the pile spacing and aircraft weight are greater;the main gear load is more concentrated,and the soil arching effect becomes weaker.