公路小净距段隧道中夹岩稳定问题与施工控制措施

小净距隧道是介于分离式隧道和连拱隧道之间的一种特殊结构形式,目前在国内已有较多成功经验,具有较高的安全性和经济性。受制于环保和用地等因素,小净距隧道的应用将会越来越广泛。本文结合金鸡山隧道建设工程,从开挖方式选择、小净距段相互影响性划分、爆破控制、中夹岩加固等方面总结设计和施工方面的经验,并根据金鸡山隧道的实际情况,提出合理建议。

Rock Stability Problems and Construction Control Measures in Highway Tunnels with Small Spacing

The small net distance tunnel is a kind of special structure between the separated tunnel and the multi-arch tunnel.At present,there are many successful experiences in China,with high security and economy.With the restriction of environmental protection and land use,the application of small clear distance tunnel will be more and more extensive.Based on the construction project of jinjishan tunnel,this paper summarizes the experience in design and construction from the aspects of selection of excavation method,division of mutual influence between small clear distance sections,blasting control and reinforcement of middle rock,and puts forward reasonable suggestions according to the actual situation of jinjishan tunnel.