Application Of Blasting And Temporary Supporting In Stope For Huize Lead & Zinc Ore

With the gradual depletion of mineral resources in the shallow, increasingly mines are being or will be exploited to the deep part. However, the geological conditions are extremely complicated, such as large stress, seriously crushing rock, surge increased water inflow and temperature. These factors induce that it's difficult for lifting, work environment is adverse, the costs of mining increase greatly, and it also ask for more advanced mining technology. Therefore, it is imperative to achieve safe, economical and efficient mining. Based on the foundation "Key technology development and research on exploitation of complex and high water cut mines" in the National Key Technologies R&D Program for the 11th Five-year Plan, on the systematic research of relevant literatures published in home and abroad, through theoretical analysis, numerical simulation and field test, and combining with theory and application research, some main research results were obtained in this paper as follows:(1) Research of stope blasting parameter optimization. Based on fracture mechanics and damage mechanics, we optimize parameters of quasi-smooth blasting under both cases of considering or non-considering on blasting damage. And anslyze some theoretical models of rock blasting and studies rock damage resulted from blast layer as well as blast layer damage leaded by caving hole. Furthermore, optimize blast parameters.(2) Numerical simulation of stope blasting parameters. For the main parameters which influence blasting effects (e.g. blast hole spacing, smooth layer thickness and linear charge density), Using ANSYS explicit dynamic module to analyze different conditions'effect on stress, strain, displacement, conclusion the influence degree of factors on the blasting effect. Meanwhile, the analysis and research of the smooth blasting layer damage leaded by caving hole, the surrounding rock damage caused by the smooth blasting layer, and blasting damage on the paste and roof damage.(3) Optimization of stope temporary support parameters. The factors which effect stope stability were studied. Introduce the single hydraulic props used in coal mine to the the "three high" soft-breaking of rock stope temporary support; Design the parameters of the stope structure and temperament supports associated with performance parameters of props.(4) On-site industrial experiments and data Monitoring. Indoor performance test of rock, industrial test of quasi-smooth blasting parameters optimization and industrial test of mining with roof support by single hydraulic prop were carried out. After observing the effect of quasi-smooth blasting, working conditions of single hydraulic prop and interaction effect of surrounding rock and the prop, designed parameters of the blasting by Orthogonal experiment, and range analysis the data, and then obtained the optimal parameters of smooth blasting.