›› 2010, Vol. 31 ›› Issue (9): 2907-2912.

• Geotechnical Engineering • Previous Articles     Next Articles

Structural analysis and design method of dynamic deformation of expressway subgrade

LU Zheng1,YAO Hai-lin1,WU Wan-ping2,YANG Yang3,LUO Xing-wen1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. CCCC Second Highway Consultants Co. Ltd., Wuhan 430056, China; 3. Jincheng Bureau of Communications, Jincheng, Shanxi 048000, China
  • Received:2009-12-22 Online:2010-09-10 Published:2010-09-16

Abstract:

Based on the field test data of pavement roughness, the influencing factors on vehicle loads are analyzed considering moving velocity and vibration frequency of dynamic loads. And the reference value of design load is proposed. A simplified three-layer structure of expressway is obtained by adopting the method of Odemark equivalent hypothesis of modulus-thickness. The computation expression of dynamic deformation of subgrade is deduced with elastodynamics theorem and Fourier transform method. Combining the expression of dynamic deformation and the pavement deflection control standard of current specification, the control value of dynamic deformation of subgrade top and the determination method are derived in the contest of compatibility of deformation between pavement and subgrade. According to the control standard, a new design method of subgrade on control deformation is advanced; and three typical asphalt pavement structure are designed for illustration using this method.

Key words: pavement roughness, interaction, compatibility of deformation, Fourier transform, dynamic deformation, subgrade design

CLC Number: 

  • U 213.1
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