降低人工挖孔桩扩孔率

摘要

针对某工程中人工挖孔桩扩孔率超标的现象进行了研究，分析了影响扩孔率的因素，并从爆破参数、炮眼布置、炸药类型、护壁施工等角度入手，制定了降低扩孔率的对策，同时提出了相应的质控措施，取得了最佳的施工效果。%This paper researched the exceeding phenomenon of artificial dig hole pile hole expansion rate according to a certain engineering,ana-lyzed the factors influence of hole expansion rate,and from the blasting parameters,blast holes layout,explosive types,wall protection construc-tion and other views,formulated the countermeasures to reduce hole expansion rate,and put forward corresponding quality control measures, achieved the best construction effect.