李家峡水电站坝肩开挖爆破网络的设计与施工

Design and construction of blasting network for excavation in the dam abutments of Lijiaxia Hydropower Station

李家峡水电站坝肩开挖采用预裂爆破和梯段爆破方法施工。在设计与施工中，优化爆破参数，控制单响药量，采用孔内外延时起爆网络和多段微差起爆方式，因而保证了开挖质量，按期完成了工程任务。

The presplit blasting and bench blasting have been adopted in the excavation in the dam abutments of Lijiaxia Hydropower Station.In the design and construction,the optimal blasting parameters,controlled single blast charge,external,time delayed ignition network in the hole and multi section differential blasting have been adopted.Therefore,the quality and progress of excavation hava heen guaranteed.