INFLUENCE ANALYSIS OF SHAFT STABILITY CAUSED BY MINING IN JINGERQUAN MINE

Underground mining leads to the overlying rock and surface movement, deformation and failure. Shaft failure always occurs caused by the surrounding rock movement. The dip of ore-body is 55-65. That is classified into steep inclined metal mine. Shallow-hole shrinkage mining method and underhand cut and filling method are used in different levels at the same time. The issue of rock mass stability is very important in this area because developed structures and broken rock mass. The method that used in mining area in past decades is open-stope. The mining engineering in these decades has leaded to the large scale mountain cracking and ground deformation. These cracks and deformations influence the underground mining. Therefore, this study analyzed three shafts stability influenced by mining based on the engineering geology condition. The analysis method is numerical simulation. And the results provided some further evidence to support mining safty.