雪崩是高原高寒地区工程建设的主要自然地质灾害之一，也是影响铁路隧道工程建设和运营的重要因素之一。为了制定合理的雪崩防治方案，通过对隧址区域自然地理条件现场进行调查分析，确定隧道两端洞门上方潜在的雪崩发生区域。采用tan α参数作图法对雪崩扩散距离及雪崩对洞门的冲击力进计算分析，提出在主隧道进口设置25 m明洞、洞门顶部设置导雪墙、出口设置5 m明洞、安全隧道进口设置15 m明洞的雪崩防治方案。方案能有效防止雪崩灾害对铁路隧道的威胁，保证铁路隧道冬季运营安全。

Avalanche is one of main natural geological disasters for the engineering construction in plateau alpine area, and is also one of the important factors affecting construction and operation safety of railway tunnel project. In order to make a reasonable scheme of avalanche prevention and control, the potential avalanche areas above tunnel portals are determined by field investigation and analysis of the natural geographical conditions in tunnel site. The avalanche diffusion distance and the impact force of avalanche on the portal are calculated and analyzed by using tan α parameter mapping method. Based on calculation results, avalanche prevention schemes, i.e. 25 m open cut tunnel at the entrance of main tunnel and snow guide wall at the top of the portal, 5 m open cut tunnel at the exit and 15 m open cut tunnel at the entrance of the safe tunnel, are put forward. The schemes effectively prevent the danger of the avalanche disaster to the railway tunnel and ensure the safety of railway tunnel operation in winter.