地铁外挂设备用房基坑开挖爆破施工技术

Blasting Techniques of Foundation Pit Excavation for Subway External Equipment House

以青岛地铁3号线敦化路车站外挂设备用房基坑开挖为工程背景,对基坑开挖的爆破施工技术进行研究。为有效控制爆破振动和爆破飞石,结合露天开挖方法的特点确定采用浅孔台阶法爆破。综合考虑基坑周围复杂的施工环境,将基坑划分为3个爆区,不同爆区采用不同的爆破参数,提高施工效率,缩短工期。通过采用合理的爆破参数、装药结构以及爆破网路,取得良好的爆破效果,有效降低了爆破有害效应,保证基坑开挖过程的顺利进行。

With the foundation pit excavation project of Dunhua Road Station external equipment of Qingdao Subway Line 3 as the engineering background,the blasting techniques of foundation pit excavation were analyzed and studied in the paper.In order to effectively control blasting vibration and flying rock and combining the characteristics of open air pit excavation method,this study determined to adopt short-hole bench blasting.Based on the complicated construction environment,the foundation pits are divided into different blasting areas,each adopting a different blasting excavation scheme.In this way the construction efficiency was improved and the construction duration was shortened.By using reasonable blasting parameters,charging structures and blasting networks,very good blasting effect was achieved and the adverse effects of blasting was effectively controlled,thus ensuring the smooth progress of the excavation process.