Study on Drilling Technology with Triangular Drilling Rod in Soft and Outburst Seam

According to the difficult drilling and low drilling efficiency problems in soft and outburst seam of Zhaozhuang Mine,the selection principle of the drilling machine applied to soft and outburst seam was provided.After the improvement of the triangular prismatic drilling rod,a triangular drilling rod with the optimized cross section was designed.The cuttings removing mechanism of the triangular drilling rod was deeply analyzed.The FLUENT software was applied to the simulation and analysis of the cuttings pneumatic removing in the smooth center of the drilling rod with same outside diameters.A comparison was conducted on the industrial trial effects finally.The study results showed that the new developed triangular drilling rod as the drilling tools of the drilling technology could be well suitable for the complicated geological conditions of the soft and outburst seam and could obviously improve the drilling efficiency and reduce the accidents in the borehole.