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利用新型数字激光动态焦散线试验系统,采用有机玻璃板试件进行模型试验,研究了含预制不同形状空孔对岩石定向断裂控制爆破的影响规律。试验结果表明:在定向断裂控制爆破中,设置菱形空孔更有利于实现精细化定向断裂控制爆破,可有效保证巷道周边眼爆破的成型效果;对比含3种不同形状空孔试件爆生主裂纹扩展速度可知,含菱形空孔的扩展速度最大,含圆形空孔的次之,含带刻槽圆形空孔的最低;含圆形空孔试件爆生主裂纹端部动态应力强度因子总体比含菱形和切槽圆形空孔试件爆生主裂纹端部动态应力强度因子大;主裂纹扩展中后期阶段,含菱形空孔试件爆生主裂纹端部动态应力强度因子相对较小。
Using the new digital laser dynamic caustic test system, the model test is made on the specimen of plexiglass plate, and the influence law of preformed holes with different shapes on the controlled blasting of rock directional fracture is studied. The experimental results show that in the controlled blasting of directional fracture, setting diamond-shaped holes is more beneficial to the controlled blasting of the fine directional fracture, which can effectively ensure the shaping effect of the surrounding blasting of the roadway. Contrasting the blasting of the specimens with three different shapes, The crack propagation velocity shows that the diamond-shaped pores have the largest expansion speed, followed by the round pores, and the lowest ones with grooved round holes. The dynamic stress intensity at the end of the main cracks with round holes The total factor stress is larger than the dynamic stress intensity factor at the end of the main crack in the burst hole with diamond-shaped and slotted holes. In the middle and later stages of the main crack growth, the dynamic stress intensity factor at the end of the main crack of the diamond- Smaller.