摘要
锦屏引水洞群由4条均长16.67 km、开挖洞径13.0～14.6 m的马蹄形大断面隧洞组成。其#1、#2引水洞西端工程轴线穿越的工程软岩长度分别为436 m和336 m,且埋深介于1 550～1 850m,地应力40～50 MPa,施工前期发生了严重的大变形。结合《超深埋大断面特长隧洞群施工关键技术研究》课题的研究成果的应用,在极高地应力条件下,对软岩隧道(洞)大断面,采用钻爆法开挖技术,取得良好效果。
The Jinping Diversion Tunnel Group consists of four horseshoe-shaped, large cross-section tunnels that have the average length of 16.67 km and the diameter of 13.0-14. 6 m, wherein as regards the Diversion Tunnel #1 and #2, on the conditions that the length of soft rock, through which the western engineering axes go, reaches 436 m and 336 m respectively; the buried depth is between 1 550-1 850 m; and the geostress is 40-50 MPa, serious deformation arose in early stage of the construction. This paper, combining with application of the achievement of the subject ＂Study on Key Construction Technology for Deep-buried Extra- long Tunnel Group with Large Cross-section＂, under the condition of extremely high geostress, adopted the technology of excavation with drilling and blasting for soft rock tunnel with large cross-section, and obtained good effect.
出处
《路基工程》
2013年第4期158-161,共4页
Subgrade Engineering
基金
中铁二局集团公司科研项目(201005)
关键词
隧道
极高地应力
工程软岩
玻璃纤维锚杆
钻爆法开挖
tunnel
extremely high geostress
soft rock
glass fiber reinforced plastic （GFRP） bolt
excavation with drilling and blasting
