Numerical Simulation Optimization Of Pillar Caving Methods And 3D Visual Design Of Hole

Safe and efficient pillar mining is important for improving mine resources recovery and achieving sustainable development. Proper pillar caving method and blasting parameters are two effective ways to improve the quality of pillar mining. According to engineering of Fankou lead-zinc mine, the methods including theoretical analysis, numerical simulation and on-site investigation were used comprehensively in this paper. Combined with "3D cavity monitor and the calculation method of visualization in FanKou lead-zinc mine" research project, and by adopting software tools, such as Surpac, Flac3D, LS-DYNA and etc.,3D visual pillar model based on cavity monitor has been built, and the research has been carried out about numerical simulation optimization of mining method of pillar with complex boundary. In the end,3D blast hole design of pillar has been achieved and the charge weight and decouple coefficients of periphery-hole which had the greatest impact on filling were optimized, which provided technical support for safe and effective pillar mining. The main research contents are as follows:(1) 3D visual model with complex boundary is built by using CMS to detect the stope beside pillar, which provides technical support for 3D blast hole design of pillar and pillar mining method.(2) Displacement field, stress field and the variation of plastic zone of the retreating side pillar mining method and the level caving of pillar have been analyzed by using numerical simulation software, thus the pillar mining method was optimized.(3) Deep hole blasting database is created by 3D design software and then 3D visual blast hole design of pillar mining has been achieved.(4) Using Explicit dynamic analysis software LS-DYNA to optimize hole charge weight and charge structure obtained the maximum safe dose and appropriate decouple coefficients.This paper closely combining with the engineering practice, studied pillar mining method,3D blast hole design, the maximum safe dose, decouple coefficients by using numerical simulation and visual modeling, which provides a basis for safe and efficient mining of deep pillar, and it has important theoretical and engineering application value.