中深孔台阶爆破开挖大型基础坑的方法

高层建筑在岩层中开挖大而深的基础坑，以往是采用深孔爆破。为了加快工程施工速度与降低工程费用需用新方法，为此将采矿技术中深孔台阶爆破应用于基础开挖。文中阐述了应用这种方法的具体技术及适用条件，并提出了爆破槽的概念。

MEDIUM-LENGTH HOkE BENCH BLASTING METHOD FOR LARGE FOUNDATION PIT EXCAVATION

Large and deep foundation pits of high buildings in rock formations are usu-ally excavated by short-hole blasting method For quicker project progress and lowercosts,a nsw method.is needed.Bench blasting with medium-length holes,which is a com-mon practice in the mining industry,has been applied to high building foundation excava-tion.Thigpaper describes the particular technique problems with and concrete conditionsfor the application,and proposes;the concept of blasting cuts.