基于正交设计的露天含水炮孔冲孔效应敏感度分析.

There are many factors influencing the punching effect of open air water holes, and it is of great significance to study each factor to control the sensitivity of the punching effect Based on the principle of orthogonal design, 9 on site blasting tests were carried out in Manjiazhai stope. Punching rate, average punching height of packing body and average punching acceleration of packing body were used as test indicators, and SPSS statistical software was used to introduce range analysis. With analysis of variance, four factors, including explosive unit consumption, packing length, packing particle size and hole spacing, which may affect the test index, are studied to control the sensitivity of the test index. The results show that only the packing particle size and packing length have a significant influence on the punching rate, and the most significant factor is the packing particle size. The packing length has a significant influence on the average punching height of the packing body, and the packing particle size and the unit consumption of explosive have a significant effect on the packing. The average punching acceleration of the volume has a significant impact, and the packing particle size is the most critical influencing factor. The optimal blasting parameter combination during mining in Manjiazhai stope is obtained. The unit explosive consumption is 0.35 kg/m$, the packing length is 5 m, the packing particle size is 5 -- 10 mm, and the hole spacing is 7 m. The parameters are substituted into the on site production blasting. The post punching rate dropped by 79. 75%, which is of guiding significance for subsequent production blasting and similar engineering practices in the stope. [ABSTRACT FROM AUTHOR]