孔内事故 meaning in English

hole trouble

Settlement of one specially complex down hole accident in bored pile
一起特殊复杂的钻孔灌注桩孔内事故处理
Trouble shooting for the common in - hole accidents in vibroflotation pile construction
冲孔桩施工中常见孔内事故的处理方法
Drilling technology , drilling fluid formulae , coring technology , use of drilling pipe and prevention and treatment of hole accidents used in drilling in in - situ leaching uranium deposit are presented and concluded in this paper
摘要总结介绍了松辽盆地可地浸砂岩铀矿钻探的施工工艺，冲洗液配制及管理，可地浸砂岩铀矿钻探的目的层松散砂体的取心技术和退心技术，钻探管材的使用及孔内事故的预防与处理。