Study On Curve Parameters Of High-speed Railway Nearby The Station In Difficult Mountainous Areas

With the sustained and rapid development of the national economy, the high-speed railway should also be developing at an amazing speed in the future within a period of time. But the attendant problem is that with the constructions of high-speed railway from the eastern region to the west, the unique mountains, hills and other landscapes in these regions have become a major constraint that impact on the high-speed railway construction cost, travel speed and so on. On the premise of not affecting the train speed, smaller curve radius and larger limited slope can effectively adapt to the terrain, so as to reduce the engineering cost. This paper did some relevant calculations and simulation analysis for the selections of curve parameters near the high-speed railway stations where stop trains and cross trains coexist.This paper analyzed the setting principles and relevant norms of high-speed railway alignment parameters, explains the related principle of train traction calculation. In the meantime, this paper explained the calculating method of driving dynamics in selecting balance curve parameters, and analyzed the differences of driving dynamics and vehicles-track dynamics. This paper briefly introduced SIMPACK dynamics modeling principles, established relevant models of vehicles-track dynamics simulation, and explained the relevant kinetic parameters and controlled indicators.This paper integrated train traction calculation with dynamic simulation. According to the relevant principles of train traction calculation, this paper calculated the V-S diagrams of the train starting-up/braking on the flat slope, braking down the slope and starting-up on the up the slope, and the V-S diagrams when the train is crossing long steep grade with the speed of300km/h.The actual speed of the stop trains and cross trains were calculated by the distance of the station and the curve we want to set. Afterwards, the recommended value of the minimum curve radius curves at different positions was given by the traditional method of kinematics.By the study, we found that the error of the result calculated by the method of driving dynamics is relatively bigger when the line conditions were bad because of ignoring the influences of the suspension system in the train. Meanwhile, since the simulated analysis can get more dynamic indexes including of comfort, safety and abrasion resistance indexes, more balanced curve parameters require comprehensive consideration of various indexes. Therefore it’s very necessary to calculate by the method of vehicles-track dynamics when the conditions of lines are very complex in difficult mountainous areas. Then, the simulation analysis was done by the method of vehicles-track dynamics and the parameters were modified. And the more precise referenced values of the curve parameters near stations were finally given.Finally, this paper analyzed the impact of the existences of slopes on high-speed train dynamic response in the condition of crossing the curve. The results showed that slopes mainly influence the safety indicator when the train crosses the curve, which should be taken seriously.