移动荷载下加筋道路系统的动力响应

将加筋道路的面层简化为弹性梁，加筋地基作为横观各向同性体，同时考虑了下卧土层孔隙水的影响，用半解析法对在匀速移动条形线荷载作用下的加筋道路体系的动力响应问题进行了研究.由忽略土粒压缩和土体自重的Biot波动方程出发，对荷载进行Fourier级数展开，假设了响应函数的级数形式，结合边界条件，由待定系数法求解了考虑固液耦合作用的加筋道路在移动荷载作用下的土体位移、有效应力及孔压表达式.求解过程中考虑了面层和加筋地基之间的相互作用，并假设两者在接触面处竖向位移相等.通过计算，分析了加筋率、筋材模量、荷载移动速度等对路面竖向位移的影响.数值分析结果表明，当加筋率在0.010～0.022时，对加筋效果的影响较大；加筋道路路面竖向位移随着荷载移动速度的增大而增大，达到峰值后迅速减小.

Dynamic response of reinforced pavements system subjected to moving loads

The concrete reinforced pavements was simplified as an elastic beam and the reinforced base was treated as a transversely isotropic layer.With considering the influence of porewater in the subgrade,the dynamic response of reinforced pavements subjected to moving loads was studied analytically and numerically under conditions of plane strain.The Biot's full dynamic poroelastic theory was employed under the assumption of an incompressible solid grain and neglecting the apparent mass density.The loading function was presented by a Fourier series expansion.The governing equations of motion were solved by using the boundary condition.The interaction between the beam and the pavement was considered and the vertical displacement of the beam and the pavement at the interface was assumed to be identical.The mechanical behavior of the reinforced pavements was investigated through varying the reinforced ratio,elastic modulus of reinforcement and load speed.Numerical results indicated that the effect of reinforcement on soil was significant when the reinforcing ratio ranged from 0.010 to 0.022.Furthermore,the vertical displacement of reinforced pavements increased with increase in load speed and decreased rapidly after the vertical displacement reached peak.