岩石巷道二阶二段掏槽爆破优化分析

为了解决因矸石过大而导致出矸时间过长,进而影响整个巷道掘进的问题,基于应力波叠加原理和二阶二段掏槽技术,提出通过采用多阶段一次爆破的方式,对现有的爆破和施工参数设计进行优化,然后从分形的角度对爆堆进行分析。经过现场试验和块度分析后发现:多阶段掏槽一次爆破可以有效地控制矸石粒级分布,平均块度直径减小了5 cm,矸石大块率明显降低,分形维数有所增加;大幅度缩减出矸时间和打眼装药时间,分别减少30、60 min;月循环进尺提高22.2%,有效地保障了硬岩巷道的掘进效率。

Optimization Analysis of Two-step cutting blasting on Rock Roadway

In order to solve the problem that the gangue transport time is too long due to the large size, and then influences the tunneling of the whole roadway, based on the principle of stress wave superposition and the two-step cutting technology, a multi-stage one-time blasting method is proposed. The blasting parameters are optimized, the blasting result is analyzed from Fractal Dimension. After field test and block analysis, it is found that the multi-stage one-time blasting can effectively control the distribution of block size, the average block diameter is reduced by 5 cm, the large block rate is obviously decreased, and the fractal dimension is increased; the time of gangue transportation and drilling&charging were reduced by 30 minutes and 60 minutes respectively; the monthly footage was increased by 22.2%, ensuring the tunneling efficiency of the hard rock roadway.