Similar Simulation Test Study of Unloading Continuous Mining in Deep Double Middle Sections
To explore the ground pressure control mechanism of unloading mining in deep metal mine and determine a reasonable deep unloading mining technology scheme,the simultaneous mining of level 1 000 m and level 850 m of Jinchuan No.2 mining area were taken as the engineering background,and five mining schemes were proposed according to the mine status.Similar physical models were established based on similarity criteria.Combining digital speckle measurement and stress monitoring technology,simulated tests were conducted on above mining schemes,and the evolution laws of displacement and stress in the simulated mining process of each scheme were compared and analyzed.The test results are concluded as follows.Firstly,the settlement rate of the overlying strata in each middle section of the model is relatively stable,while the settlement amplitude of the rock layer at the top of the excavation area is the largest.Comparing and analyzing the roof settlement and hanging wall and footwall displacement of Scheme Ⅰ to Scheme V,it is found that Scheme Ⅰ and Scheme Ⅴ have overall better performance and each has its own advantages.Secondly,from the perspective of rock stress and displacement,each of the five schemes has its own advantages.Considering the displacement stability of hanging wall and footwall and the control of stress concentration areas,Scheme V has the best displacement control and pressure relief effect,especially in the third and fourth section unloading mining where the displacement changes are small and the stability is good.Thirdly,based on the similarity theory,a similar material model is determined through material proportions tests to analyze the physical properties of the ore and filling bodies.The test results show that Scheme V,that is pre-cutting the hanging wall and footwall and adding unloading roadways,can effectively control the stress and settlement of the hanging wall and footwall,roof,and floor of the stope,and is the best unloading mining scheme.
Deep double middle sectionsUnloading miningSimilar simulation testDigital speckle systemStress monitoring
万方数据
维普
