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1 工程简介中条山供水工程是小浪底移民重点补偿工程,隧洞全长11km,断面尺寸为2.0m×2.4m,城门型。4号隧洞长4.65km,是地质条件最复杂的一条隧洞。2 隧洞开挖施工方法2.1 光面爆破参数的设计根据本工程隧洞断面小的特点,隧洞开挖采用全断面一次爆破成型法,使用光面爆破技术。爆破参数的设计采用工程类比法和理论计算相结合的方法。初选的爆破参数如表1所示。表1初选隧洞爆破参数表
1 Project Introduction Zhongtiashan water supply project is Xiaolangdi resettlement key compensation project, the tunnel length of 11km, section size of 2.0m × 2.4m, Shing Mun type. The No. 4 tunnel is 4.65km long and is the most complicated tunnel with geological conditions. 2 Tunnel Excavation Construction Method 2.1 Glossy Blast Parameters Design According to the characteristics of the tunnel section of a small, full-faceted tunnel blasting using a full blasting method, the use of smooth blasting technology. The design of blasting parameters is based on the method of engineering analogy and theoretical calculation. The primary election blasting parameters are shown in Table 1. Table 1 Preliminary election tunnel blasting parameters table