在沿海地区进行大规模水下钻孔爆破,在钻凿炮孔时,经常会遇到一些复杂的地质,如卵石层、破碎带、流沙、软硬夹层等,不但给钻孔带来很大困难,而且由于地质结构松散,极不稳定,往往引起孔壁塌落、回填,造成有钻进而无孔深的情况。我队在宁波港煤码头基槽炸礁施工中,地质情况为表 Large-scale underwater drilling and blasting in coastal areas often encounter complex geological conditions such as gravel, broken belt, quicksand, soft and hard interlayer, etc. when drilling boreholes, which not only bring great holes Difficult, but also because of the geological structure is loose, very unstable, often cause the hole wall slump, backfill, resulting in drilling without holes deep situation. My team in Ningbo Port coal base rock tank construction, the geological conditions for the table