为解决位于繁忙的公路运输干线上方、复杂高陡边坡上的隧道洞门边坡加固施工和特殊地理环境的施工组织管理问题，保证陡壁上隧道洞门及边坡加固施工期间公路上行驶的车辆、施工设施和施工人员的安全，保证加固后的边坡满足铁路运营期间长期稳定和安全，选用多项边坡加固技术进行组合，重点介绍施工过程中的边坡监测方法及各种安全防护措施。结论如下： 1）高阳寨隧道进口洞门边坡的加固，因地制宜地集中了多项边坡处理方法是行之有效的，达到了预期的加固目的; 2）边坡的稳定监测，在整个施工过程中严格实施了边坡稳定监测方案，没有观测到明显的边坡变形数据和现象,这种监测方式在岩质陡壁上效果有限，是否适用有待商榷; 3）公路绕行是必要的。

The slope at the entrance portal of Gaoyangzhai tunnel is high and steep and is located above national highway No. 318. It is very difficult to reinforce the slope. A combination of several slope reinforcement technologies is adopted, so as to ensure the safety of the vehicles on the national highway and the construction facilities and construction labors and to ensure that the reinforced slope can meet the stability and safety requirements of the railway in the longterm operation. The reinforcement technologies adopted are presented, and the plan of slope stability monitoring during reinforcement and the safety guarantee measures are described. Conclusions drawn are as follows: 1) The combination of the several reinforcement technologies adopted in the reinforcement of the entrance portal slope of Gaoyangzhai tunnel is effective; 2) Strict slope stability monitoring plan is performed, but no obvious slope deformations is found. The effect of such slope stability monitoring is limited. It is still to be determined whether such slope stability monitoring is applicable or not; 3) The route changing of the national highway is necessary. 