材料非线性对沥青道面结构力学响应的影响

Nonlinear Influence of Material on Mechanical Response of Airport Asphalt Pavement

摘要:

借助三维有限元软件，建立半刚性基层沥青道面和柔性基层沥青道面结构模型，分析了B737，B767，B777飞机荷载作用下，土基材料非线性、粒料材料非线性、土基和粒料材料均为非线性三种情况时对道面结构力学响应的影响.结果表明，在三类不同起落架荷载作用下，随着轮载的增加，材料非线性对道面结构力学响应的影响逐渐增加，土基非线性对两种道面结构的力学响应影响不明显.半刚性基层沥青道面结构，粒料非线性与土基和粒料均为非线性时对道面表面弯沉和土基顶面竖向压应变影响不显著，但对沥青面层底部的拉应变和半刚性基层底部的拉应力影响较为明显.柔性基层沥青道面结构，粒料非线性对表面弯沉的影响不显著，但对土基顶面竖向压应变影响较大，土基和粒料均为非线性时对沥青面层底部拉应变的影响明显.

Abstract:

Three dimensional finite element model for asphalt pavement structure with semi rigid or flexible base was proposed. It was used to analyze the influence of nonlinearity of granule and subgrade soil on the mechanical responses of airport asphalt pavement under loading of aircraft B737, B767 and B777. It was shown that the influence of material nonlinearity increased as the aircraft loading increased. The influence of subgrade nonlinearity is not obvious on the mechanical response. For the semi rigid base airport pavements, the influence of granula nonlinearity and that of both subgrade and granula is little on the surface deflection at the top of the surface and the vertical compressive strain at the top of the subgrade, but is great on the tensile strain at the bottom of the asphalt concrete layers and the tensile stress at the bottom of semi rigid base. For the flexible airport pavement, the influence of granula nonlinearity is little on the surface deflection and is great on the tensile strain at the bottom of the asphalt concrete layers. Both the influence of subgrade nonlinearity and granula nonlinearity is great on the tensile strain at the bottom of the asphalt concrete layers.