西山特长隧道新增斜井小角度进入正洞施工

Construction of new inclined shaft entering into major hole with small angle of Xishan extra-long tunnel

通过对山西地区西山特长隧道新增斜井,在交叉口段围岩较差、结构受力复杂情况下,如何以21.1°的小角度安全的进入正洞进行了总结和分析,达到了安全、快速施工小夹角交叉口的效果,解决了公路隧道经常出现小夹角交叉口在围岩较差的情况下施工困难、容易发生坍塌的问题,对同类工程施工具有指导意义。

The essay summarizes and analyzes how new inclined shaft entering into major hole with intersection angle of 21.1° of Xishan extralong tunnel in Shanxi region under the conditions of weak surrounding rock at intersection and complicated structure force, achieves safe and fast construction effect with small intersection angle, and solves problems such as difficult construction and collapse under the condition of weak surrounding rock at intersection with small intersection angle, which has certain guiding meaning for similar engineering construction.