Study On Stope Structure Paraameters Optimization And Stability Analysis Of Wangershan Mining Area

Ongoing economic and social development demands more from mineral resources. Due to continuous exploitation, mining production is done in deep underground area with growing depth. Deep mining is subjected to the impact of various factors. As a result, deep mining has become a difficult task with low efficiency achieved. Safe, efficient and cost-efficient deep mining poses a huge challenge to researchers in the mining field. To fulfill this purpose, it is of great necessity to conduct scientific and rational study on structure parameters and stability concerning mining stope.Under the auspices of the project of Strengthened Safety Deep Mining of Fractured Orebody in the Wangershan,a study was made concerning structure parameters and stability concerning deep mining stope. Main findings of the said study are presented below.(1) An survey was made concerning relevant field data and geoengineering information, based on which the distribution of joints, fractures, and underground water was commanded. Using these information, a rock quality IRMR classification method specifically targeted at the Wangershan mine was formulated, with which rock quality in the said mine was classified.(2) In light of the mining condition of the Wangershan mine,5mining programs were sellected and cross-checked against each other concerning their merits and shortcomings. The ideal point of entropy weight method was then used to decide the most suitable one in terms of technological and economical indexes. The sublevel drilling and back filling method was selected for design of stope parameter design.(3) Nine programs of stope structure parameter optimization were proposed. The finite element analysis software ABAQUS was applied to simulate deep mining under the said nine programs. The displacement of the roof, the floor pillar and above surrounding rock as well as the distribution of the Mises equivalent stress and the plastic zone were analyzed, based upon which, the optimal mining structure parameters were settled down.(4) A simplified mining roof-pillar mechanical model was established. The catastrophe theory, alone with the potential energy function for the roof-pillar system, was then used upon the said model to figure out the cusp catastrophic model. The said model was then used to conclude the necessary and sufficient condition for loss of stability of the roof-pillar system. The said condition for stability loss was then testified in the Wanger mountain mine project, and the test result proved the solidity of the optimized stope mining parameters.