移动荷载下无面层加筋路基的动力响应

为研究移动荷载下饱和加筋复合土体的动力响应问题,采用半解析方法,将加筋路基看成宏观上的横观各向同性体,由Biot波动方程出发,对荷载进行Fourier级数展开,假设响应函数的级数形式,结合边界条件,由待定系数法求解考虑固液耦合作用的饱和加筋复合土体在移动荷载作用下土体位移、有效应力及孔压的表达式,通过计算分析加筋率、筋材模量、荷载移动速度对复合土体竖向位移和孔压的影响.数值分析结果表明:加筋率只有在一定范围内时加筋效果才会比较明显;加筋复合土体表面最大竖向位移随着速度的增大而增大,达到峰值后迅速减小.

Dynamic response of reinforced unpaved subgrade subjected to moving loads

To study the dynamic response of reinforced subgrade subjected to moving loads,the semi-analytical numerical method was used.The reinforced subgrade was considered as a transversely isotropic layer and the full dynamic poroelastic theory of Biot was employed.The loading function was presented by a Fourier series expansion.By using the boundary condition,the governing equations of motion were then solved.Mechanical behaviors of the reinforced composite were investigated through varying the reinforced ratio,the elastic modulus of reinforcement and the speed of moving loads.Numerical results indicate that the effect of reinforcement on soil is significant when the reinforcing ratio is in a certain range.Furthermore,the vertical displacement of reinforced composite increases with the increasing load speed,and decreases rapidly when the vertical displacement reaches the maximum.