软岩巷道周边控制爆破的研究

Study on the controlled perimeter blasting for drift in soft rock

软岩中的光面爆破 ,往往眼痕率低 ,出现超挖 ,效果不理想 .对此进行了分析 ,导出崩落眼爆破损伤光爆层岩石的损伤因子对光爆层岩石性质的影响关系以及损伤岩石中的光爆参数计算式 ;指出采用岩石定向断裂爆破技术 ,并考虑崩落眼爆破对光爆层岩石的损伤效应 ,设计出相应的光爆参数 ,是提高软岩光爆效果的有效方法 .同时 ,也为进一步研究软岩的光面爆破理论与技术明确了方向 .

The smooth blasting for drift in soft rock is usually accompanied by bad result with low traced hole rate and over break. The causes that ideal result does not appear are analyzed, the relation between the damage factor by production blasting and the properties of remaining rock are found, and the calculation formulae for smooth blasting parameters are deduced in the paper. It is pointed that application of directional split blasting technique is the effective method to improve the smooth blasting if rock damage by production blasting, initiated prior to perimeter blasting, is taken into consideration, and if relevant parameters are determined. Furthermore, the direction in which the theory and technique of smooth blasting in soft rock are researched deeply is made clear.