铁路隧道坡度折减方法的探讨

Discussion on the Method of Gradient Reduction in Railway Tunnel

探讨传统铁路设计隧道坡度折减采用方法及存在问题,通过分析影响铁路隧道坡度折减的因素,采用基于非恒定流理论试验及仿真计算得出的隧道附加空气阻力值,据此研究不同隧道长度、横断面积、机型及牵引质量情况下的隧道可采用最大坡度及其变化规律。提出铁路选线设计隧道坡度折减绝对折减法,为当前铁路选线隧道坡度折减设计实践与理论研究提供一定参考。

This paper describes the principle of gradient reduction in railway tunnels, discusses the methods and existing problems of the gradient reduction in railway tunnels, and analyzes the factors affecting the gradient reduction in railway tunnels. It obtains the additional air resistance values of tunnel based on unsteady flow theory test and simulation. Furthermore, it studies on the maximum gradients and charge rules of tunnels under different tunnel lengths,different cross-sectional areas,different locomotive types and different traction masses. The paper proposes an absolute reduction method of tunnel gradient reduction for railway line selection design, which provides a reference for the design practice and theoretical study of gradient reduction of railway tunnels.