Analysis Of The Adaptibility Of Jointless Track Circuit To Ballast-Less Track

Ballast-less track and jointless track circuit are the two key techniques which will be wildly used in the construction of high-speed railway system in China. The safe, smooth and easy-to-maintain ballast-less track system will play an important role in improving the development of the railway transport. However, there will also come some disadvantageous influences when the ballast-less track is chosen. With the influence of the netlike steel bars in the reinforced concrete structure, the energy loss of the track will be raised. All the actions leading to the same result: the decline of the distance which the signal could be transmitted in.Begins with the physic model of the ballast-less track system, based on the finite element method on electromagnetic field, with the help of the software Maxwell 3D, it is giving the simulation and further research on the situation of a single rail bar, ballast track and ballast-less track, searching for the reason why the decline of the capacity of the transmitting in the rail bars happens. By analyzing in the distribution of the electromagnetic field surrounding the steel bar network, it is put forward that the compensating current, of which the position, the material of conductor and the magnitude is acquired from the contrasting. At last, an estimate of the method is formed, after the contrasting analysis between the model with and without the compensating current.From the result of simulation, it is obvious that the influence on the jointless track circuit by the ballast-less track could be completely avoided when a compensating current with proper situation, carrying conductor and magnitude is introduced.In the paper, a discussion on the precision of the model and the factors which can produce errors is also given. It may be the most shortage that the impedance of the rail bars could not be given finally, compelling the analysis developing on the macroscopically energy loss. In the same while some other factors related is not worked over.In conclusion, this model can show the influence of the ballast-less track, and it is practicable to give some possible ways to take off this disadvanteous action. There are still some errors in the process of modeling, which ranges in a tolerable scale.