控制爆破技术在坪上集水廊道工程开挖中的应用

Application of Presplit Blasting Technique to Excavate Pingshang Project's Collecting Gallery

针对山西坪上应急引水工程复杂环境下集水廊道开挖的具体情况,提出了"两侧先行预裂、再横向拉槽创造临空面、最后进行主体廊道爆破"的施工方法,有效地控制了爆破震动及飞石对临近公路、路边民房、上方通讯线路及水源的损害,为同类工程提供了有益的经验。

Being aimed at the concrete situation to excavate Pingshang Emergency Diversion Projece＇s collecting gallery under complex environment,a construction method is put forward.It is presplit blasting two lateral sides first,excavating transverse channel to make free face second,and blasting main boby of gallery finally.By means of this method,the blast vibration has been controlled effectively,and the damage on neighbouring highway,buildings,communication line and water source by flying stone can be avoided.The useful experience is provided in this paper for other similar projects.