Research On Mechanical Properties Test Of Shuohuang Railway Line

In order to grasp the dynamic response characteristics of the heavy-duty railway track structure under the action of large axle heavy-duty trains,and provide basic experimental data support for the study of heavy-duty railway train-track coupling dynamics,the research group Will based on the K70 + 650(bridge section)of the Shuohuang Railway and K70 + 939(subgrade section),the dynamic performance test of heavy-duty railway lines was carried out.The results show:(1)As the running speed of the test train increases,the vibration acceleration of the track shows an increasing trend;Wheel-rail force and track structure displacement are basically the same(or slightly changed).It is fully proved that the vibration acceleration is highly sensitive to the running speed of the train.(2)When the test train passes the test section at a speed of 10~75km/h,the response of the inner and outer sides of the straight line is different due to the train load,and the difference of most mechanical indexes between the left and right sides of the line is obvious.For the subgrade,most of the external displacement is smaller than the medial displacement,and the lateral acceleration is greater than the medial acceleration,indicating that the curve segment has a significant response to the inner and outer dynamics of the orbit.(3)For the bridge test section,the transmission proportional relationship of the vertical vibration acceleration of the rail,sleeper and track bed under the conditions of the two test trains is 11.57:1.77:1 and 8.81:1.71:1;For the subgrade test section,the ratio of the vertical vibration acceleration of the outer rail,sleeper and track bed is 13.95 : 1.7 : 1 and 9.53 : 0.9 : 1;The ratio of the vertical vibration acceleration of the inner rail,sleeper and track bed is 14.26 : 1.43 : 1 and 8.21 : 1.93 : 1.