广西凭祥大型市政隧道施工技术

Construction Techniques of Large Municipal Tunnel in Pingxiang of Guangxi

摘要:

广西凭祥弄怀隧道属岩溶地区大型市政深埋越岭短隧道，跨度大、岩溶发育，根据实际工程地质情况，采用钻爆开挖法——新奥法施工，洞口及围岩较破碎地段遵循短开挖、弱爆破、超前强支护、早衬砌的原则，通过采取综合措施圆满完成了隧道的掘进开挖。

Abstract:

Nonghuai tunnel is a large municipal tunnel in karst area of Pingxiang of Guangxi with karst development, this short tunnel is deep-buried and large-span. According to the geological conditions, drill-blast tunneling—new Austrian method was used; the principles of short cutting, weak blasting, advanced strong support and early lining were followed in broken sections of structural opening and surrounding rocks, the tunneling was successfully finished by comprehensive measures.