大断面小净距隧道中间岩柱加固方案研究

The Research about Strengthening Project of Middle Rock Pillars in the Big Section and Small Clear Distance Tunnel

探讨了在质量较差的Ⅴ级围岩中大断面小净距隧道中间岩柱加固方案,得出当左右洞之间的距离小于最小净距时,对中间岩柱进行注浆加固能很好地改善隧道洞周位移及衬砌内力,而对中间岩柱进行对拉预应力锚杆加固并不能起到很好的效果。对大断面小净距隧道中间岩柱的加固有一定的借鉴意义。

This paper discusses middle roc pillars reinforcement scheme in the poor quality surrounding rock in the big section and small clear distance tunnel , it is concluded that when the distance of the two hole less than the minimum interval, the grouting reinforcement in middle rock pillars can perfect the displacement and internal force lining in tunnel, and prestressed anchor reinforcement in middle rock pillars does not have very good effect. This paper have certain reference significance for the reinforcement of middle rock pillars in the large section and small clear distance tunnel.