Reasonable compensation coefficient of maximum gradient in long railway tunnels

作     者：Sirong YI Liangtao NIE Yanheng CHEN Fangfang QIN 

作者机构：School of Civil Engineering MOE Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong University Chengdu610031 China 

出 版 物：《Journal of Modern Transportation》 (现代交通学报（英文版）)

年 卷 期：2011年第19卷第1期

页      面：12-18页

学科分类：1201[管理学-管理科学与工程(可授管理学、工学学位)] 081406[工学-桥梁与隧道工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0802[工学-机械工程] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 0823[工学-交通运输工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 082301[工学-道路与铁道工程] 

主　　题：railway tunnel maximum gradient profile gradient compensation 

摘      要：This paper deals with the theory and calculation methods for compensation of the gradient in railway tunnels through theoretical analysis, numerical calculation, and statistic regression methods. On the basis of the principle that the resultant force is zero, the formula of the maximum calculated gradient was derived for the freight and passenger line and high-speed passenger special line. The formula of aerodynamic drag in tunnel is provided using the domestic and foreign relevant experimental investigations, and revised with modem train and engineering parameters. A calculation model of aerodynamic drag when the train goes through a single-tracked tunnel was built. Finally, the concept of maximum calculated gradient was adopted to revise the formula for compensation of the gradient in railway tunnels.