Abstract:

In this article finite element software is applied in analysis of the influence of aircraft load,surface layer thickness,flexural modulus of concrete and the rebound modulus of subgrade parameters on subgrade service depth with the additional stress is equal to the gravity stress of 10% as a standard. The results show that:the influence of aircraft load type on the service depth is relatively distinct,service depth in subgrade of light aircraft is about 1.5 m,and service depth of heavy aircraft reaches 6.0 m. The service depth in subgrade with the heavy aircraft ranged from 4.4~6.0 m under the condition of slab thickness in 0.2~0.5 m range,which extended by 36.4% of the lower value;the surface layer material flexural modulus to influence depth is very
small. The service depth in subgrade with the heavy aircraft ranged from 4.4 m to 5.4m under the condition of the subgrade resilient modulus in 18~80 MPa range,extended by 36.4%. The conclusion above is more referenced by soft foundation treatment and analysis.

Key words: rigid pavement, service depth, finite analysis, additional stress