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我队所勘探的矿区地質構造为一向斜,矿床基岩多被構造作用所破坏,構造裂隙很深,破碎帶的厚度为20～40公尺。在此構造裂隙和喀斯特地层进行鑽进时,标高較高的鑽孔,冲洗液常有60～100％被吸收;在低窪地段的鑽孔則产生涌水自噴現象,冲毀了孔壁岩石,降低了孔壁的稳定性。例如我队某鑽孔从187公尺起为構造破碎带,在鑽进中冲洗液大量漏失停止循环,以致岩粉沉淀,孔壁坍塌,岩心管不断卡塞。为
The geological structure of the mining area explored by our team has always been oblique. The bedrock of the deposit is mostly destroyed by tectonics. The fractures are deep and the thickness of the fractured zone is 20-40 meters. In this structure of cracks and karst strata for drilling, the higher elevation drilling, washing fluid often 60 to 100% is absorbed; in the low-lying sections of the borehole gushing water from the spontaneous phenomenon, destroyed the hole wall rock, reducing Hole wall stability. For example, a hole in our team from 187 meters for the construction of broken belt, a large number of leakage in the drilling fluid to stop circulation, resulting in precipitation of rock powder, hole wall collapse, the core pipe continue to jam. for