In coring drilling, under-water cement grouting was often used for wall protection, leakage blocking, boreholesealing and downhole accident treatment.
在岩心钻探中，常常要用水下灌注水泥的方法来护壁、堵漏、封孔、处理井故。
2
Because of the weak boreholesealing and inadequate use of the initial free face, the higher investment and unsatisfactory blasting effect still exist in the mine tunnel excavation blasting.
由于炮孔堵塞不牢和初始自由面利用不充分，井下平巷的掘进开挖爆破仍存在投入大、爆破结果欠理想等问题。
3
It introduces one kind of new technology — "ladder" -like sealing off a borehole by slipping casting.