Dynamic Response of Saturated Soil Under Rectangular Moving Load Based on Nonlocal Biot Theory
In order to further investigate the dynamic response of saturated soil subgrade under rectangular moving loads,firstly,based on the nonlocal Biot theory,a nonlocal pore elasticity calculation model considering pore size effects and rectangular loads is established for saturated soil subgrade as the study object.Then,considering the permeable boundary conditions on the surface of roadbed,a second-order inverse Fourier transform is used to obtain the analytical solution of the dynamic response of saturated soil in the time domain under rectangular moving loads.Finally,the effects of the changes in rectangular load movement speed and load natural frequency on the vertical and horizontal displacement response of saturated soil are analyzed with different modes and nonlocal parameter values.The result shows that(1)nonlocal parameters have little effect on the displacement response of saturated soil in low modes,while the influences are greater in high modes,and the displacement response mainly depends on low modes;(2)nonlocal parameters are directly proportional to vertical displacement and negatively correlated with horizontal displacement;(3)when the natural frequency of the load increases,the displacement is affected with nonlocal parameters,as the nonlocal parameters increasing,the peak displacement response will appear at lower natural frequencies of the load,and the peak displacement response will shift to the left;(4)when the natural frequency of the load increases,the displacement is affected with the speed of the load movement,and a peak displacement response will occur at lower load movement speeds;(5)when the speed of load movement increases,the displacement is affected with the natural frequency of the load,and the peak displacement response corresponds to a decrease in the natural frequency of the load.
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