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With economic development , human increasing mineral demand , the constant expansion of mining shallow easy mining mineral resources are depleting , mining development and gradually became deep , but has a rock formation pressure and the amount of surrounding rock deformation in deep mining large inherent characteristics of this great difficulty brought to the roadway and routine maintenance , addition , deep mining also cause surface subsidence , tunnel fall , rock burst , and the impact of pressure and other disasters to mine normal the safety production caused by the great risks , in order to avoid frequent disasters , and to provide the necessary basis for the roadway , especially in an important position in the tunnel surrounding rock stability of the entire mine is particularly urgent and important . Outstanding Youth Science Foundation of Chongqing and the Program for New Century Excellent Talents in support of the following aspects of the study , the following major elements : ① Qixia Hill lead-zinc - 425m - 475m , and -525m three laid by the middle of some important roadway for the pressure cell and long-term monitoring of the displacement meter to determine the the stope mining process , the roadway roof and two gang stress and displacement trends over time . ② the improved gray forecasting model GM (1,1) to forecast short-term data and long-term trends of roadway roof and two gang stress and displacement , the predicted results agree well with the measured values ??, and verify the applicability and accuracy of the prediction model . ③ using the finite element program , to simulate the conditions of the stope mining roadway roof and two sides stress and displacement , and get a different recovery conditions , roadway roof and two gang stress field and displacement field , with the actual monitoring data for comparative analysis , show that the numerical accuracy of the calculation , the analysis provides a theoretical basis for the stability of surrounding rock .
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