Analysis On Dynamic Response Of Subgrade Of High-Speed Railway

The railway is a main artery of the communications and transportation of our country, and plays a very important role to development of national economy. At present, with the operation of every large passenger traffic special line, the high-speed railway of China enters a fast developing period, thus the railway puts forword a lot of new challenges of the designing and operation and maintaining. Among them, the deformation question that the roadbed works up in the high-speed train under dynamic load becomes the important restriction of development of high-speed railway. So, launching the research of the dynamic effect on high-speed railway seems very important.This paper combines the first quasi-high-speed highway of our country -Qinhuangdao- Shen yang passenger traffic special line on-the dynamic response test, the dynamic response of the railway roadbed are analyzed and calculated, first of all, after considering the production mechanism (basic factor, under the vehicle of rail, etc.) , it conclude a formula of train load the expression that include loaded in vibration of high-speed train, sum up, appear one can contain pace, circuit smooth-going, arrow high, wheel getting heavy .Secondly, the smooth-going mechanism that produce of the track are main analyzed, employing the density function of the power shake spectrum to analysis land linearly at random frequently, introducing the theory of the smooth-going numerical simulation of track by the triangular progression law and cyclic graph law; Finally, adopting the total mark of implicit time of Neumark to estimate in advance --The revision law and electricity can be regarded as the procedure DYNEXP2D, some structure under calculating and getting the railway rail separately (mainly consider the road bed) drive a vehicle to make a series of data such as the displacement, acceleration, stress in the cross section, vertical section with the double-line railway in the single-track railway, drawn and analyzing researched the law for the chart by the data.Through studying, it gets the law of distributing that the motive force responding value in the road bed is on the cross section, vertical section and Basic change law with driving speed, thickness of base bed top layer, base bed top layer rigidity, heavy relevant factors of train axle under the circumstances that the train loads function. Through Comparing and analyzing of theory calculated and surveying at the scene, it verifies the dependability of computational analysis. For knowing the dynamic characteristic and carrying on the track-foundation design to provide a reference further.