Research of raise boring technology on constructing shaft in gold mine and engineering application

Although raise boring method has been mature in construct within 100 m shaft in gold mine, it's the first time that raise boring machine constructs nearly 160 m long and 3 m diameter gold mine shaft by one time in Tanjian mountain.The use of the BMC400 raise boring machine is based on research and calculation of pulling force and torque force formula under reaming process, also based on the analysis of rock compressive strength from rock histogram.What enrich the connotation of the raise boring technology is that combined raise boring machine used in reaming process with SPS600 geological drill in pilot process.The key techniques such as reasonable arrangement of stabilizers and improvement of drilling tool has also been carefully studied and the deflection rate is lower than 0.2%.Ultimately, to achieve good results under the condition of lack of relevant construction experience and the specific development of rock strata.The engineering practice application shows that use of raise boring method in large diameter deep shaft is worth learning and promoting in gold mine.