CAJ | 학술논문

分析了切缝管定向断裂爆破裂纹的形成与扩展机理，在切缝处应力集中和压力差共同作用下形成初始裂纹，而后的裂纹扩展经历了切向拉伸应力作用下的扩展阶段、爆生气体驱动压力作用下裂纹稳态扩展和爆生气体驱动下的宏观裂纹扩展3个阶段。在理论分析的基础上结合工程实际，提出了切缝管药包定向断裂复合楔形掏槽爆破和周边孔切缝管药包定向断裂爆破技术。现场应用效果表明：切缝管爆破可提高炮孔利用率和眼痕率，降低爆破对围岩的扰动损伤，改善掏槽爆破和周边爆破效果，有利于提高巷道掘进速度。
분석료절봉관정향단렬폭파렬문적형성여확전궤리，재절봉처응력집중화압력차공동작용하형성초시렬문，이후적렬문확전경력료절향랍신응력작용하적확전계단、폭생기체구동압력작용하렬문은태확전화폭생기체구동하적굉관렬문확전3개계단。재이론분석적기출상결합공정실제，제출료절봉관약포정향단렬복합설형도조폭파화주변공절봉관약포정향단렬폭파기술。현장응용효과표명：절봉관폭파가제고포공이용솔화안흔솔，강저폭파대위암적우동손상，개선도조폭파화주변폭파효과，유리우제고항도굴진속도。
The formation and propagation mechanism of directional fracture blasting crack of the slit tube were analyzed. The initial cracks were formed under stress concentration and pressure difference at cut joints. Then the crack propagation process experienced the growth stage under the action of the tangential tensile stress,steady crack propagation phase and mac-roscopic crack propagation caused by detonation gas driving pressure. On the basis of theoretical analysis and engineering prac-tice,the directional fracture blasting technology of joint-cutting cartridge in composite wedge cut holes and peripheral holes were proposed. The spot application indicated that the cut tube blasting can improve the utilization rate and hole mark rate of blast holes,reduce the blasting disturbance damage to surrounding rock and improve the effect of cut blasting and perimeter blasting. In brief,it is conducive to quicken speed of roadway drivage.