复杂地层条件下地铁隧道下穿建筑物爆破设计

Blasting Design of Subway Tunnel in Complex Formation Conditions Beneath Buildings

青岛地铁一期工程3号线是青岛市的首条地铁线路,地铁隧道沿线下穿众多的房屋建筑。青岛市的地层上部多为软弱层,下部为基岩,表现为上软下硬的复合地层。地铁隧道的现场施工多采用钻爆法施工,爆破对上软下硬复合地层的变形有着重大的影响,施工中对爆破震动具有严格的要求。针对青岛地铁某区间下穿建筑物洞段,爆破设计中采用微差毫秒爆破技术有效地的控制了爆破震动,为类似的工程提供了参考。

The 3rd line of Qingdao subway project is the first subway line in Qingdao,and the subway is beneath many houses and constructions. The upper strata in Qingdao mostly are weak layer,and the lower part is the bedrock,performances to be compound formations which are soft-hard. Construct method of the subway tunnel usually use drill and blast,and blasting has a major impact on deformation of softhard compound strata. It is of stringent requirements on construction blasting vibration. In an interval of Qingdao subway where is beneath buildings,we used millisecond delay blasting method in blasting design,and we effectively controlled the blasting vibration,provides a reference for similar projects.