为解决高海拔地区低压和低氧环境带来的隧道施工供氧、通风等技术难题，采用现场试验及测试的方法，对高海拔隧道施工人员缺氧状况、供氧效果、机械排污量等进行研究，结合理论推导及数值计算，得到如下结果： 人体的缺氧危险等级分为严重缺氧（Ⅰ）、缺氧（Ⅱ）、存在缺氧危险（Ⅲ）和不缺氧（Ⅳ）4级； 基于肺泡氧分压与氧气体积分数关系的不同缺氧等级下的氧气体积分数控制标准； 不同海拔CO体积分数控制标准模型； 基于风管开口处流量理论的风管漏风率海拔修正系数计算公式； 风机风压、功率的海拔修正系数公式； 考虑人体劳动的平均能量代谢率海拔修正系数的不同海拔下施工人员劳动强度指数及强度等级。

The oxygen supply and ventilation of high altitude tunnel in low pressure and low oxygen environment are very important. The field test and monitoring methods are adopted; the hypoxia situation of construction personnel, oxygen supply effect and mechanical pollution of high altitude tunnel are studied; and theoretical reduction and numerical calculation are carried out. Some conclusions are as follows: 1) The hypoxia of construction personnel can be divided into 4 grades, i. e. serious hypoxia (Grade Ⅰ), ordinary hypoxia (Grade Ⅱ), potential hypoxia (Grade Ⅲ) and non hypoxia (Grade Ⅳ). 2) The CO volume fraction models in different altitudes are obtained. 3) The calculation formula for air duct leakage rate based on altitude correction coefficient are deduced by air flow theory at air duct opening. 4) The altitude correction coefficient formula for air pressure and power of fan is obtained. 5) The labor intensity index and grade in different altitudes considering average energy metabolism rate based altitude correction coefficient are obtained.