琅琊山隧道大断面软弱围岩爆破施工技术

Large section and soft surrounding rock blasting construction technology of lang ya shan tunnel

琅琊山隧道为大断面软弱围岩隧道,施工中采用分部开挖和光面爆破结合技术,在爆破参数、炮眼布置、装药结构等方面进行了参数的选取和优化,实践证明隧道取得了较好的爆破效果,隧道开挖轮廓线完整,隧道周围的高压线塔基完好无损。该施工方法安全可行,对类似工程具有一定的参考价值。

lang ya shah tunnel is a large section and soft surrounding rock tunnel. The technology of stepped excavation and smooth blasting is adopted under construction; parameters such as explosive parameter, blast-hole arrangement, charging structure are chosen and optimized. The engineering practice achieves good blasting effect, excavation contour line of the tunnel is complete, and the tower foundation of high-voltage cable surrounding the tunnel is undamaged. The result shows that this construction method is feasible and it also provides reference value for similar project.