在隧洞开挖工程中进行控制爆破,以减少超挖和欠挖,获得平整的开挖輪廓线,从而减少石碴装运量和混凝土回填量,加快工程进度,降低工程造价,减輕对围岩的震动破坏,进一步保証施工的安全,尤其对于不加衬砌的水工隧洞更有重要的意义。影响隧洞开挖輪廓平整度的主要因素有:炸药爆炸威力,炮眼装药量,炮眼相对位置,岩石物理結构 Controlled blasting in tunnel excavation project to reduce over-excavation and under-excavation, to obtain a smooth excavation profile, so as to reduce the ballast load and concrete backfill volume, speed up the project progress, reduce the project cost and reduce the impact on the surrounding rock Of the vibration damage, to further ensure the safety of construction, especially for the lining of the hydraulic tunnel more important significance. The main factors that affect the smoothness of tunnel excavation profile are: the explosive power of explosives, the amount of blasting, the relative position of blasthole, the physical structure of rock