Study On Experiment Of Rock Crack And Destabilization During Deep And Large Scale Mining

With reducing of shallow mineral resources and using large-scale mining equipment,the mining of mineral resources gradually develops in both deep and large scale. The high ore stress, high osmotic pressure, high geothermal conditions and severe disturbances of large-scale mining are a serious threat to the stope stability. Therefore, it is urgent to study the deformation and failure characteristics of surrounding rock in the process of large-scale deep mining. The paper takes Macheng iron mine with the mining depth of 900m and the annual output of 27 million tons as the background mine, and the methods of numerical simulation and similar simulation are selected to study the deformation and failure characteristics of the surrounding rock in the large-scale and deep mining stope progress. The main contents are as follows:The numerical simulation method is used to analyze the stress, displacement of the surrounding rock and the displacement of the plastic zone in the process of the excavation,and the analysis is from the ore body strike, the strike of the vertical ore body and the strike along the sandstone strata.As a supplement to the numerical simulation experiment, similar simulation experiments on deep excavation with large structural parameters were carried out on a 900m deep ore body under the action of preloading, which will use YJ203 large-scale similar material loading simulation test-bed. The deformation and failure characteristics of surrounding rock in deep mining are analyzed macroscopically and microscopically,and the variation laws of stress and displacement of surrounding rock and overburden during the excavation are obtainedBased on the data and the results of numerical simulation and similar material simulation test, the stress, displacement, deformation and failure laws of the surrounding rock of Macheng iron mine are obtained, which can be helpful for the safe production.