软弱围岩大断面隧道大拱脚台阶法施工技术

On construction technique of large crossing-section and arch spring benching mining method of weak surrounding rock

针对大断面浅埋隧道穿越围岩破碎、节理发育、围岩完整性差的复杂地质,简述了Ⅴ级围岩大拱脚台阶法施工工艺、施工质量控制要求,总结了大拱脚台阶法在软弱围岩地质隧道中取得的成功经验和良好的实践效果,以期指导工程实践。

Aiming at the complicated geology of the large-section shallow burial tunnel through surrounding rock with crushed rock and weak joint development and wholeness of surrounding rock, the paper indicates the construction craft, the construction quality control requirements of the V-degree surrounding rock large benching mining method, and sums up the large arch benching method achieves the successful experience and better practice effect of the weak surrounding rock tunnels, so as to direct the engineering practice.