Tunnel blasting is ineffective in excavation. Over-excavation results in large cost increase, underbreak and extra blasting causes over-excavation and leads to safety risk and constraints the process, and even causes quality problems such as collapse and initial support back hole. In order to further improve the tunnel blasting effect and strengthen the control of tunnel excavation process, it is very necessary to use smooth blasting for the excavation of the rock mass surrounding the tunnel.%隧道爆破开挖效果较差,超挖导致增加了大量费用、欠挖补炮形成超挖并造成安全隐患和制约进度,甚至造成坍方现象、初期支护背后空洞等安全质量隐患.为进一步提高隧道爆破效果,加强隧道开挖过程控制,对隧道石质围岩开挖要求采用光面爆破十分必要.
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