刘高飞
LIU Gao-fei (The 17th Engineering Bureau Group Company,China Railway Construction Corp., Taiyuan,Shanxi 030006,China)

• 1:中国铁道建筑总公司第十七工程局集团公司 太原030006

摘要(Abstract)：

采用微差控制爆破与分步开挖相结合的施工方法。第一步 ,用垂直孔和楔形掏槽开挖沉井中央的基岩 ,用三个凿岩爆破循环开挖到设计标高 ,形成一个直径 4 1m、深 3 4m井。第二步 ,用水平孔开挖厚 0 6 5m井壁 ,每循环下挖 0 5m ,即沉井每次下沉 0 5m ,直至下沉到位。文中主要介绍了炮孔布置、爆破参数选取和起爆顺序设计。
A construction method of combining short-delay controlled blasting with stepped excavation was adopted.Firstly,the vertical blastholes and wedge-shaped cut were used for excavation of base rock in the centre of the well foundation,and a well with a diameter of 4.1 meters and depth of 3.4 meters was formed with three rounds.Secondly,the horizontal holes were used to excavate the well wall with a thickness of 0.65 meters,with a excavating depth of 0.5 meters per round.In other words,the well foundation fell down by 0.5 meters per round until reaching the predetermined position.The blasthole pattern,blasting parameter selection and firing sequence design were mainly presented in this paper.

关键词(KeyWords)： 基岩开挖;沉井;微差控爆;分步开挖
Base-rock excavation; Well foundation; Short-delay controlled blasting;Stepped excavation

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘高飞
LIU Gao-fei (The 17th Engineering Bureau Group Company,China Railway Construction Corp., Taiyuan,Shanxi 030006,China)

参考文献(References)：

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