Dynamics Performance of Subgrade-Tunnel Transition on Chongqing-Suining Ballastless Track

摘要

Experiments were conducted on China railway high speed electrical multiple units (EMUs) CRH2 and freight car C80 on Chongqing-Suining high-speed ballastless track. Based on the experimental results,the dynamics performance of cement concrete transition and cement stabilized aggregate transition was analyzed. The results show that the dynamic stress,vibration displacement,vibration velocity,vibration acceleration and other vibration parameters vary steadily on the profile section of transitions,and that at the adjoining position between subgrade and tunnel portal,cement concrete transition has gradual hardness change,whereas cement stabilized aggregate transition exhibits good elasticity,small shock,and small dynamic effect of the cars.