轨道交通线路平面曲线限速探讨

Discussion on Plane Curve Speed Limit of Rail Transit Line

轨道交通线路平面曲线的允许通过速度值即曲线限速值,是信号设计的基础数据,加大限速值可提高列车运行速度和服务效率、加强客流吸引能力。目前相关规范虽提出“允许瞬时超速5 km/h”和“允许短时出现未被平衡横向加速度0.5 m/s^2”,对限速情况均有一定程度改善,但仍略显不足。通过不同规范限速改善措施的效果对比分析及实际运用结果,从直接提高线路设计标准、提高允许短时未被平衡横向加速度、降低信号警戒值3方面探讨改善方案,通过3个方案对比分析,结合国内外相关规定及试验结果,提出采用提高允许短时未被平衡横向加速度至0.6 m/s^2(相当于欠超高91.8 mm)的方案。研究表明,这样可提高轨道交通全线运行速度和服务效率。可见采用提高允许短时未被平衡横向加速度的方法可为今后的曲线限速设计提供借鉴。

The allowable passing speed value of the plane curve of the rail transit line is the curve speed limit value,which is the basic data of the signal design.Increasing the speed limit value can improve the train operation speed&service efficiency,and strengthen the passenger attraction.At present,although the relevant specifications put forward allowing instantaneous overspeed of 5 km/h and allowing unbalanced lateral acceleration of 0.5 m/s^2 in a short time,the speed limit situation has been improved to some extent,but it is still slightly insufficient.Based on the comparison&analysis of the effect of speed limit improvement measures in different specifications&the results of practical application,the improvement scheme is discussed from three aspects:directly improving the line design standard,increasing the allowable short-term unbalanced lateral acceleration and reducing the signal warning value.Through the comparative analysis of three schemes,combined with the relevant regulations and test results at home and abroad,it is proposed to increase the allowable shortterm unbalanced lateral acceleration scheme with speed of 0.6 m/s^2(equivalent to 91.8 mm under super elevation).Research shows that it can improve the speed&service efficiency of rail transit.It can be seen that the method of increasing the allowable short-term unbalanced lateral acceleration may provide references for the design of curve speed limit in the future.