论文部分内容阅读
简旧矿区卡斯特現象非常突出,岩石节理发育,空洞裂隙較多。鑽进中,坍塌掉块严重,特别是接触变質带和矿化带更为厉害。55、56年先后採用了反循环和双管合金鑽进。反循环鑽进虽然能护井壁,保证質量,但只适用于淺孔;而双管合金鑽进也只能起保証質量作用,所以在探孔井壁的維护是个突出的问题。当时每个鑽孔几乎每次降下鑽具都是中途卡住差几米、甚至几十米而不能到井底,需要化費很多时間扫坍塌掉块,严重时甚至要扫十天、半月。且新换一
The phenomenon of caste in the simple mining area is very prominent, and the rock joints develop with more hollow cracks. Drilling, collapsed block serious, especially the metamorphic belt and mineralization with more powerful. 55, 56 years has adopted a reverse circulation and double pipe alloy drilling. Although the reverse circulation drilling can protect the wall to ensure the quality, but only for shallow holes; and double-tube alloy drilling can only play a role in ensuring quality, so in the exploration borehole wall maintenance is a prominent issue. At that time, almost every time drilling down each drill hole stuck in the middle of a few meters worse, or even tens of meters and can not go to the bottom, you need to spend a lot of time swept away collapsed blocks collapse, serious or even swept ten days and a half months. And for a new one