地下厂房吊车梁岩台爆破开挖试验研究

EXPERIMENTAL STUDY ON BLASTING EXCAVATION OF ROCK BENCH FOR CRANE BEAM IN UNDERGROUND WORKSHOP

为了在复杂地质条件下爆破开挖吊车梁岩台 ,进行了垂直孔或水平孔光爆以及垂直孔预裂等开挖方案试验。通过不同开挖方案爆破效果的分析和比较 ,确定了能使岩台成型良好的开挖方式和爆破顺序。爆破后利用声波法测定了围岩破坏深度。检测结果表明 ,围岩破坏深度较浅 ,所确定的开挖方式和爆破顺序能够保证吊车梁施工与运行期的安全。

In order that rock bench for crane beam is excavated by blasting in complex geological condition,the excavation schemes such as smooth blasting with vertical or horizontal holes and presplitting with vertical holes are tested.Through analyzing and comparing the blasting results of different excavation schemes,the excavation mode and blasting sequence by which the rock bench with a qualified shape can be formed are determined.After blasting,a sonic method is used for measurement of the damage depth of the country rock.Testing results show that the damage depth of the country rock is less and the determined excavation mode and blasting sequence can ensure the safety of the crane beam during its construction and running.