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一、地层与施工简况我队施工的渔溪矿区钻遇岩层节理、裂隙非常发育，所施工的钻孔都存在严重渗漏，并有坍塌、掉块现象。使用松香酸钠、PAM无固相冲洗液和PAM低固相泥浆均不上返，多次采用浓泥浆（25秒）护壁堵漏和灌早强水泥堵护均无成效。多数钻孔采用顶漏钻进，经常待水，个别钻孔因漏失、坍塌严重而被迫半途而废。如该矿区ZK3005孔，设计孔深550米，钻孔倾角80度，由于钻遇大断层、破碎带、孔内漏失、坍塌严重，采用水泥堵护三次无效，共消耗水泥1900公斤。后采用PAM配制的浓泥浆钻进，仍然全泵漏失。共耗粘土粉15700公斤，因粘土粉供不应求，费用太高，孔深达224.24米时，难于继续钻进而终止施工。
First, stratum and construction briefs Construction of the Yuxi mine construction team met the rock joints, cracks are very developed, the construction of the drill there is a serious leakage, and collapsed, dropped block phenomenon. The use of sodium rosinate, PAM no solid flushing fluid and PAM low solid phase mud did not return, multiple thick slurry (25 seconds) wall plugging and irrigation early strong cement blockade no effect. The majority of drilling using the top drain drilling, often to be water, individual drilling due to leakage, serious collapse and forced to halfway. If the mine ZK3005 hole design hole depth of 550 meters, drilling angle of 80 degrees, due to drilling a large fault, broken belt, holes lost, collapse serious, the use of cement blocking three invalid, a total consumption of 1900 kg of cement. After the preparation of thick mud using PAM drilling, still full pump loss. A total of 15,700 kilograms of clay powder, clay powder in short supply, the cost is too high, the hole depth of 224.24 meters, it is difficult to continue drilling and termination of construction.