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东林煤矿大斜度受控定向工程孔的设计与施工四川煤田地质局李文榕（执笔）四川煤田地质局１３６队李俊，张晓渝我局与重庆南桐矿务局地质公司合作施工的东林煤矿大斜度受控定向工程孔于１９９３年５月顺利竣工。终孔深度３２４．６ｍ，开孔顶角３５°、终孔５９°。沿钻孔...
Design and Construction of Large Inclined Controlled Oriented Engineering Hole in Donglin Coal Mine Li Wenrong, Geological Bureau, Sichuan Coalfield (Team) 136 teams from Sichuan Coalfield Geology Bureau Li Jun, Zhang Xiaoyu Donglin Coal Mine, co-operated by Bureau of Geology with Nantong Mining Bureau, Large gradient controlled directional engineering hole was successfully completed in May 1993. Final hole depth 324.6m, opening angle 35 °, the final hole 59 °. Along the drilling ...