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前坪水库导流洞工程洞身段岩体以Ⅲ类围岩为主,现场采用爆破开挖。结合现场水文地质和施工技术条件,最终确定开挖分上部圆弧段和下部直墙段2部分,2部分同时起爆,一次将导流洞上层爆破成设计断面。在实施爆破施工前,合理选择起爆材料及堵塞材料,详细确定爆破参数及洞身段石方起爆网络。
The main part of the rock mass of the tunnel body of the diversion tunnel of Qianping reservoir is dominated by Ⅲ type of surrounding rock, and blasting excavation is adopted on site. Combined with on-site hydrogeology and construction technology conditions, the upper arc section and the lower straight wall section of the excavated section are finally confirmed to be 2 sections and 2 sections are simultaneously detonated, and the upper section of the diversion tunnel is once exploded into a design section. In the implementation of blasting construction, a reasonable choice of initiating material and plugging materials, detailed determination of blasting parameters and the body section of stone body detonation network.