Abstract
This paper attempts to evaluate the characteristics of the ground vibration induced by ultra high speed trains moving on the current test line and to predict ground vibration levels along the projected routes under various conditions. First, the field vibration measurement by the use of the test line was carried out. Through the test results, it was indicated that the structural properties of girder bridges and surrounding ground have a great influence on the ground vibration along the test line in addition to the effects of periodic exciting force by the train. Next, numerical analysis models were constructed to simulate the traffic induced vibration problems. The 3-dimensional finite element method using voxel elements was employed in this paper in order to analyze the vibration model having a large number of degrees of freedom. Through the comparisons with the test results, it was confirmed that the employed numerical models gave fairly good results. Finally, it was shown by the present simulation analyses that the ground vibration levels along the ultra high speed railway would be much below the criteria used in the SHINKANSEN under several conditions considered in the projected routes.
