存在采空區(qū)的臺(tái)階爆破效果評(píng)價(jià)及參數(shù)優(yōu)化
[Abstract]:In the east opencast coal mine of Pingshuo, Shanxi Province, in view of the existence of goaf under the surface, the bench blasting technology needs to be further optimized in order to reduce the bulk ratio, the back crack, the hole piercing, and the explosive unit consumption. The influence of blasting vibration on the stability of roof and soil slope in goaf is improved. Aiming at the problems of bench blasting at present stage, the fuzzy mathematics analytic hierarchy process (AHP) is used to establish the blasting effect evaluation model and the blasting effect is evaluated, and the influence of blasting vibration on the roof stability of goaf is simulated by ANSYS. On the basis of ensuring the safety and stability of goaf, the parameters of bench blasting are optimized by means of LS-DYNA simulation and field test. According to the actual situation of the goaf in the east opencast, the main research results are as follows: (1) according to the actual situation of the underground goaf in the east open pit mine, three first-class evaluation indexes and ten second-level evaluation indexes are selected. The hierarchical structure diagram of each level index is established, the weight and membership function of each index are determined according to the hierarchical structure diagram. Finally, the evaluation model of bench blasting effect of east open-pit mine is established, and the comprehensive analysis and evaluation are made to optimize the blasting effect of front step. It is concluded that there are still some problems in bench blasting in East Open-pit Mine, which need further optimization, and the safety distance between bench blasting and goaf is 200 meters. The minimum safety thickness of roof is 35 meters. (2) on the basis of evaluation, according to the existing equipment and blasting design software, the optimization scheme of blasting parameters is designed, and the blasting parameters are simulated by LS-DYNA. The simulation results of blasting effect under different blasting parameters are analyzed and compared. The blasting effect of a group of parameters with hole mesh parameter 7 脳 6 and rectangular hole arrangement is obtained. (3) according to the simulation results of LS-DYNA, a set of optimum hole arrangement mode and hole network parameters are obtained, and then verified by field comparison test. Compared with the blasting effect of the field test, the blasting effect is more consistent, and the optimized blasting parameters are proved to be reasonable. The above research results show that the bench blasting technology of the East Open-pit Mine existing in goaf needs to be further improved, and the optimized blasting parameters do improve the blasting effect, and the roof stability of goaf is also solved and the expected goal is achieved.
【學(xué)位授予單位】:武漢理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TD235
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