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以附加应力等于地基自重应力的10%为标准,采用有限元方法分析了飞机荷载类型、面层厚度、柔性面层材料和土基回弹模量对地基工作区深度的影响。结果表明:飞机荷载类型对工作区深度的影响较为显著,飞机荷载分类为LC的轻型机型荷载在土基中产生的附加应力较小,影响深度较浅;荷载分类为LD的中型飞机工作区深度约为3 m左右;飞机荷载分类为LE的重型机型工作区深度可达8.2 m。面层厚度和材料弯拉模量对影响深度影响很小。重型飞机作用下,土基回弹模量在20~80 MPa内变动时,路基顶部一定深度范围内的附加应力值随着回弹模量的增加而减少,附加应力值由32.89 MPa减至24.19 MPa,减小幅度为26.46%,而该参数对工作区深度的影响甚微。
Taking the additional stress equal to 10% of the self-weighting stress of the foundation as the standard, the influence of aircraft load type, surface thickness, flexible surfacing material and the subgrade resilience modulus on the working area depth of foundation is analyzed by finite element method. The results show that the impact of airplane load types on the working area depth is significant. The light aircraft loads classified as LCs have less additional stress and less influence on the soil foundation. The medium aircraft working area with load classification as LD The depth is about 3 m. The working area of heavy aircraft with airplane load classification as LE can reach a depth of 8.2 m. Surface thickness and material modulus of elasticity have a small effect on the depth of influence. Under the action of heavy aircraft, when the modulus of soil subgrade changes within 20 ~ 80 MPa, the additional stress in the depth of subgrade at a certain depth decreases with the increase of rebound modulus, and the additional stress decreases from 32.89 MPa to 24.19 MPa, a reduction of 26.46%, while the parameters of the depth of the work area little effect.