摘要:研究目的:合理确定重载铁路隧道坡度折减取值，能够显著减少工程投资，对于减少越岭地段隧道长度、 降低施工风险和施工难度都意义重大。本文结合重载铁路特点，对重载铁路隧道坡度折减取值进行计算分 析，并同普通铁路进行对比；同时，对于取消隧道坡度折减的可行性，从理论计算和运营实际进行分析，最终提 出隧道坡度折减取值建议。 研究结论:（1)重载铁路按现行《线规》规定的坡度折减系数来计算隧道内因空气阻力引起的坡度折减值 不尽合理，宜结合设计线路的具体条件，根据隧道内附加空气阻力值计算确定；2)对于地形困难地段，为显 著节省投资，经综合技术经济比选，隧道内可考虑坡度少折减或不折减；3)该研究结论可为重载铁路隧道坡 度折减设计取值提供参考。

Abstract ： Research purposes ： If we can calculate the value of gradient discount of heavy - haul railway tunnel reasonably, construction investment is saved, the length of tunnel is shorten, construction risk and difficulty is reduced. Combined with feature of heavy - haul railway, this paper calculates and analyzes the value of gradient discount of heavy -haul railway tunnel，and compares the value of heavy - haul railway with normal railway. At the same time the feasibility of elimination of gradient discount of tunnel is analyzed from the theoretical calculation and operation，finally suggestion on the value of gradient discount of heavy - haul railway tunnel is proposed. Research conclusions:( 1) The value of gradient discount of heavy - haul railway tunnel is not same as the value in code for design of railway line，and should be calculated on addition air drag parameter in tunnel. （2 ) In order to save investment，the value of gradient discount of heavy - haul railway tunnel can be reduced or eliminated in difficult geographic and geomorphic conditions. (3) The conclusions can provide some references for designing value of gradient discount of heavy - haul railway tunnel.