Study on Dynamic Response Law of Double-track Heavy-haul Railway Subgrade
A three-dimension sleeper-subgrade-foundation finite element model was established to investigate the dynamic response law of the double-track heavy-haul railway subgrade.The results show that the dynamic stress at the subgrade surface below the train running track presents a saddle-shaped distribution along the transverse direction.The dynamic stress below the upline rail decreases with the increase of the depth when a train passing through the upline,whereas,the dynamic stress at the center of the subgrade under different operation modes increases first before decrea-sing with the increase of the depth.The vertical dynamic displacement at the subgrade surface presents significant con-cave distribution characteristics along the transverse direction.The peak dynamic displacement caused by the one-way operation of a fully-loaded train can be 5.36 times of that induced by an empty train.The effect of train axle load on the subgrade velocity response is relatively small.The peak acceleration at the subgrade surface increases about 10％when the train axle load increases from 25 t to 30 t.The dynamic response of the subgrade subjected to the train operation on the double-track railway is greater than that under one-way train operation.The peak acceleration,velocity and dynamic displacement below the downline rail caused by a fully-loaded train running on the upline are greater than those caused by an empty train running on the downline.
double-track heavy-haul railwaysubgradefinite element analysisdynamic response
万方数据
维普
