车辆-温度荷载耦合作用下层状道路结构动力响应研究OA

To address the unclear long-term coupling mechanisms between vehicle loads and environ-mental thermal loads in the dynamic response analysis of pavement structures,this study proposes an analytical model that comprehensively considers the coupled effects of moving vehicle loads and diur-nal temperature variations.By utilizing thermoelastic theory to describe the pavement surface,base,and subgrade,and introducing the theory of a thermally coupled saturated porous elastic medium to simulate the soft soil foundation,a fully coupled analytical model encompassing the vehicle load,ther-mal load,and layered pavement system is established.Based on this model,combined with the Laplace-Hankel integral transforms,the system's solutions in the transform domain are derived,and solutions in the physical time domain are obtained through numerical inversion.The results indicate the following:Under diurnal temperature variations,thermal fluctuations attenuate rapidly with in-creasing depth,with daily variations primarily concentrated within a shallow depth of 0.3 m below the pavement surface;These shallow temperature changes directly induce thermal deformation in the sur-face layer,which further propagates downward to trigger dynamic responses in the subgrade and foun-dation,and the excess pore water pressure in the soft soil foundation peaks at a depth of approximately 2 m;Under the coupled action of thermal and vehicle loads,the maximum vertical displacement at the pavement surface and the variation in pore water pressure within the soft soil foundation reach 61％and 240％of the values induced by the vehicle load alone,respectively.This research provides a theo-retical framework and quantitative reference for accurately evaluating the dynamic responses and long-term performance of pavement structures under the coupled effects of complex environmental and traf-fic loads.