›› 2015, Vol. 36 ›› Issue (7): 2027-2033.doi: 10.16285/j.rsm.2015.07.026

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of dynamic response of inhomogeneous subgrade under moving loads

ZHOU Feng-xi1, 2，CAO Yong-chun1，ZHAO Wang-gang1   

  1. 1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2014-05-14 Online:2015-07-11 Published:2018-06-13

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Abstract: Based on the theory of linear elastodynamics, and combined with the coordinate transformation, the dynamic governing equations for a half-plane inhomogeneous subgrade are developed. The dynamic response of a two-dimensional inhomogeneous subgrade subjected to moving loads is analyzed based on a semi-analytical method. Using Fourier series expansion, and assuming the series form of response function, the analytical expressions of various physical quantities are developed for the inhomogeneous subgrade subjected to moving loads, in which the shear modulus can arbitrarily change with depth. Assuming the shear modulus has an exponential distribution with the thickness, a parametric study is presented to illustrate the influence of the foundation soil inhomogeneity and load moving velocity as well as shear modulus at subgrade surface on the dynamical response of foundation soils. The calculated results are compared with the responses of a homogeneous subgrade, showing that the vertical displacement of soil decreases with the increase of the shear modulus at the surface of subgrade and the inhomogeneous gradient index, and increases with the increase of the load moving velocity. Under a moving load, the dynamic responses of inhomogeneous subgrade are significantly different from that of homogeneous subgrade.

Key words: inhomogeneous subgrade, moving loads, dynamic response, semi-analytical method, Fourier series

CLC Number: 

  • TU 435
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