杏山铁矿中深孔爆破参数优化与高效改进措施

杏山铁矿为地采矿山，较高的爆破大块率，一直影响生产效率。本文结合杏山铁矿生产实际和地质条件，对布孔方式、填塞长度、起爆方式等方面在爆破落矿过程中大块产生原因进行了分析。研究结果表明：对地质条件和矿岩结构准确的分析对爆破参数的选择非常重要。三角形布孔方式、不小于400 mm的炮孔填塞和小抵抗线大孔距的参数优化能有效的降低大块率。依据现场实测将排距定为1.9 m，边孔角为57°，崩矿步距为3.8 m，采场平均大块率降低了40%，在现场实践中取得了良好的效果，解决了杏山铁矿在工程实践中大块率居高不下的难题。

Research and Application on Optimization of medium and deep hole blasting parameters in Xingshan Iron Mine

Xingshan Iron Mine is an underground mine, and the high blasting block rate has always affected production efficiency. Combining with the actual production and geological conditions of Xingshan Iron Mine, this paper analyzes the reasons for the formation of large blocks in the process of blasting and falling ore from the aspects of hole layout, filling length, and detonation method. The research results show that accurate analysis of geological conditions and rock structure is very important for the selection of blasting parameters. The parameter optimization of the triangular hole arrangement, the hole filling not less than 400 mm, and the small resistance line and the large hole spacing can effectively reduce the large block rate. According to the field measurement, the row spacing is set to 1.9 m, the side hole angle is 57°, the ore collapse step is 3.8 m, and the average block rate of the stope is reduced by 40%. Shan Iron Mine has a problem of high block rate in engineering practice.