小断面隧洞光面爆破施工技术探究

Study on Construction Technology of Smooth Surface Blasting in Tunnel with Smaller Section

水利工程中小断面隧洞的开挖受断面限制较大,给钻爆开挖、通风、排水和支护都带来了较大的困难,制约着隧洞爆破开挖的效率。文章结合西藏山南市结巴水库输水导流洞施工实例,从全断面钻爆法光面爆破开挖技术和施工管理2方面对小断面隧洞开挖爆破效率的提升提出具体控制措施,保障了施工进度和质量,提高了经济效率。

In construction of hydropower projects, excavation of tunnel with smaller section is restricted by the section. This causes difficulty in excavation by blasting, ventilation, drainage and support as well as restricts the tunneling efficiency. In combination of practice of construction of diversion tunnel of Jieba reservoir in Shannan City, Tibet, in the paper, the control measures to improve efficiency of excavation by blasting of the tunnel with smaller section are proposed in terms of the excavation technology and construction management of the smooth surface blasting with full section. These assure construction progress and quality as well as improve the economic efficiency.