钻爆法施工隧道超欠挖控制研究

为保证隧道爆破掘进成型质量、控制超欠挖和降低施工成本,从爆破技术、控制措施和施工管理等方面入手,通过优化爆破设计、完善施工工艺和落实管控措施,改善了爆破效果、有效控制了隧道掘进超欠挖现象。以月直山隧道施工工程为背景,根据隧道围岩构造与岩石性质,在全面分析造成隧道超欠挖的关键因素与主要环节的基础上,采取精准爆破技术和综合管控措施,进一步改善了隧道成型质量,降低了平均线性超欠挖,提高了施工进度和经济效益。

Study on control of backbreak and underbreak in tunnel excavation by drilling-and-blasting

In order to ensure the shaping quality of tunnel blasting excavation, control backbreak and underbreak and reduce construction cost, starting from the aspects of blasting technology, control measures and construction management, through optimizing blasting design, perfecting construction technology and implementing management and control measures, the blasting effect is improved and the phenomenon of backbreak and underbreak is effectively controlled in tunnel excavation. Taking the construction project of Yuezhishan tunnel as the background, according to the surrounding rock structure and rock properties of the tunnel, and on the basis of a comprehensive analysis of the key factors and main links that cause the tunnel backbreak and underbreak, accurate blasting technology and comprehensive management and control measures are adopted. The shaping quality of the tunnel is further improved, the average linear backbreak and underbreak is reduced, and the construction progress and economic benefits are improved.