安楚公路2~＃、3~＃大断面隧道破碎带掘进的技术措施

Technical Measures of No.2 and No.3 Large Scale Tunnel Excavation in Fractured Zone of Anchu Highway

摘要:

安楚公路的２￣＃、３￣大断面隧道均在断层破碎带中掘进，给施工带来了困难，为了确保工程的顺利进行，采用了微振弱爆破、正面短台阶、先拱后墙法的掘进技术；长管棚预注浆结合格栅拱钢支撑、喷－锚－网－喷的支护技术及围岩量测技术。

Abstract:

Difficulties are fetched in excavation of No.2 and No.3 large scale tunnels of Anchu highway,becausethey are all excavated in fractured formations.For keeping successfull progess,tunnelling techniques of light shocking,weak explosion,short step facedrift,arch prior to wall forming,supporting by long pipe shieldd vs pregroutingcombining with grid arch steel,and rock measuring technology,supportting techniques,of spraygrouting-anchoring-netting-spraygrorting are used.