| Abstract:The crown and sill pillar orebody has characteristics of scattered, small, changeable and complicated geology conditions, all these make it difficult to be stoped. Due to early exploration conditions and mining technical level, there were lots of crown and pillar orebodys left in Fankou Lead-Zinc mine. For the existing stoping technology of crown and sill pillar orebody in the mine has disadvantages of low productivity, high labor intensity, poor safety and so on, research was carried out, the main content and research achievements of the thesis are as follows:(1) A new stoping technology was proposed. The new technology adopts Boomer K41X drilling jumbo to drilling upward fanshaped medium-depth hole in the roadway, small charging car, side blasting and remote-control scraper, besides, filling immediately when the ore drawing work is completed.(2) To get appropriate structure parameters of stope, excavation process of stopes were simulated by FLAC3D, and the results are8m in width and20m in length for room stope,7m in width and10m in length for rib pillar stope, the height equal to the thickness of crown and sill pillar ore body.(3) To get appropriate parameters of drilling and blasting, fanshaped hole blasting of different hole spacings and minimum burdens were simulated by ANSYS/LS-DYNA, the results are1.4-1.6m for hole spacing and1.3m for minimum burden.(4) To get appropriate thickness of reserved orebody for protecting the upper filling body, blasting of different thickness were simulated by ANSYS/LS-DYNA, the result is0.5m for thickness of reserved orebody.(5) The new stoping technology was applied to Shn-280m210#sill pillar orebody of Fankou Lead-Zinc mine for an experiment, and got a satisfactory effect, the purposes of protect roof and surrounding rock of hanging wall and control the fragment-size of blasting were all achieved. Practice shows that the new technology have advantages of high mechanization, high productivity, operation safety and good operation environment. |
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