Dahongshan Ore Stope Optimization Of Structural Parameters Based On Numerical Simulation

The preliminary mining design of No.I copper belt in Dahongshan Iron has been completed as early as December2008, but with the infrastructure prospecting conducted we found the number of layers of orebody becomes more and thickness uneven, the presence of local ore body thickness is relatively large. DahongshanIron ore according orebody changes, comprehensive utilization of resources, while taking into account the safety of the open-pit mining on top of the orebody, adjust the mining method of No.I copper belt, the stoping subsequent filling of the original design was changed to the upward horizontal slicing and filling method. After reference the successful experience of the application of the upward horizontal slicing and filling method in Sanshandao goldmine. Dahongshan Iron initially identified the stope structure parameters of this mining method. With the gradual progress of the stoping jobs, found that the use of the stope structure parameters can not ensure the safety of the stoping in the case of joint fissures developed in some local rock mass. Then the mentor of the author accepted the optimization project of the stope structure parameters of the upward horizontal slicing and filling method in No.I copper belt in Dahongshan Iron.The numerical simulation technology is also advancing rapidly in recent years with the rapid development of computer science, play a very important role in solving the complex rock mechanics problems. Currently, the numerical simulation technology is one of the most used method in many research methods in the study of stope stability problems. FLAC-3D is a three-dimensional finite difference code developed on the basis of the original two-dimensional finite difference code, has been widely used in scientific research in the field of geotechnical engineering, mining engineering, tunnel engineering, road and railway engineering.This thesis on the basis of the ongoing optimization project of the stope structure parameters of the upward horizontal slicing and filling method in No.I copper belt in Dahongshan Iron by the mentor of the author. Carry on numerical Simulation and analyze for different stope structure parameters with FLAC-3D software, and on the basis of combined the mining technical conditions of No.I copper belt in Dahongshan Iron, put forward six simulation schemes, each scheme using different points column size, each scheme is divided into three cases carry on numerical simulation according to the different column spacing, finally, comparing the calculation results, and to come to a more reasonable stope structure parameters, previously basis for the influence of the adjacent panel under roof contact filling or not with the stoping sequence as separated by a panel and stoping a panel, to analyze the importance of roof contact filling in fill mining method. Also targeted point column evade pressure supporting measures proposed by my mentor in the process of stope structure parameters optimization, simulation analysis use of simulation software based on the selected best program, through comparative analysis of simulation results, validate and evaluate the practicality and effectiveness of the point column evade pressure supporting measures, after using the limit equilibrium method to do further analysis of the results of numerical simulation, verify the reasonableness of the results of numerical simulation. Finally, compare with the mining actual of No.I copper belt in Dahongshan Iron, evaluate the result of this thesis.