Feasibility analysis of drilling method with blind shaft sinking technology in Taigemiao mining area
Taking the east wind shaft in Shenhua Xinjie Taigemiao mining area of as the engineering background,the design shaft depth is 857.5 m,the design net diameter is 7.0 m,and the design shaft wall thickness is 850 mm.The feasibility of using blind shaft sinking method is analyzed through geological characteristics,engineering conditions,equipment capacity and drilling classification technology.The stratum and rock mechanical characteristics of the proposed eastern wind shaft are analyzed.The thickness of the bedrock will reach 870 m and the proportion of the bedrock will be 99.3%.Based on the geological conditions,wellbore functions and wellbore design parameters,the drilling depth will reach 875 m and the drilling diameter will be 10.2 m.The problems faced by the deep and large diameter wellbore drilling in whole rock formation are sorted out.The drilling grading process of deep alluvial formation in the east and thick bedrock formation in the west is compared and analyzed,and the feasibility of"one expanded shaft-forming"drilling process is determined.The diameter of advance drilling is 6.5～7 m,and the diameter of reaming drilling is 10.2 m.It is technically feasible to sinking shaft of Taigemiao mining area with blind shaft sinking method.
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