The Design Research Of The Ladder Sleeper Ballastless Track For Dali To Ruili Railway

This paper puted forward a reasonable and economical type of the ballastless track-ladder sleeper unballasted track,and established finite element model according to the feature of Gaoligongshan Tunnel which appeared as "three highs"(high geothermy,high geostatic stress,high seismic intensity) and "four active"(active neotectonic movement,active geothermal water environment,active external dynamic geological conditions,active slope superficial transformation process).First,this paper detailedly introduced the complex geological conditions of "three high and four active"of DaRui Railway, and some problems on ordinary ballastless track(bi-block ballastless track,track with elastic bearing block) arising thereform..Ladder sleeper track is suitable for Gaoligongshan tunnel due to its advantages such as light structure,fast repair,less maintenance,decreasing vibration and noise reducing,strong ability adapting basic defomation and so on.Secondly,accoding to the design concept,this paper designed the size and parameters of ladder sleeper track structure which was suitable for special geological conditon of DaRui Railway.Accoding to elastic foundation composite beam theory,this paper established wholistic model to mechanical analysis.This paper researched and confirmed the suport speacing of damping material and the reasonable stiffness when the vertical force analysis.This paper also confirmed the support position and stiffness of reasonable cushioning material by analysing the influence because of cushioning material when the horizontal force analysing.Third,according to the structure force analysis and《the guiding opinions for the design and calclutions of ballastless track,this paper did the prestress reinforcement for the ladder sleeper track structure by allowable stress method and checked up the temporary load for insuring the reinforcement securityIn the end, the paper drawed the conclusion on the research,and made a few prospects for doing further research and the valuable research direction of the ladder sleeper.