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炮孔中炸药爆轰后在炮孔周围的岩石中产生径向压缩应变波,这种径向压缩应变波使炮孔周围的岩石产生径向裂隙.径向压缩应变波在传播过程中遇临界面反射而成径向拉伸波.而反射波与入射波相互叠加,引起径向裂隙的延伸,特别是当径向裂隙与反射波的传播方向垂直时,这种腔壁裂隙的延伸效果最明显.爆轰气体产物挤入撕裂的腔壁裂隙,这些高压气体继续产生压缩,在裂隙间形或棱锥形岩楔,裂隙不断延伸直至自由面.随后气体和岩石的混合物继续沿最小抵抗线方向自由移动,直到所有气体排出自由面压力解除为止.根据高速摄影机观测的鼓包速度的水平分量和垂直分量,即可计算岩石获得冲量的大小.利用鼓包速度还可计算岩石的运动轨迹.假如岩块在飞行中不发生相互碰撞,直到与地面或其它静止物体相撞而停止.如果岩块落地后堆积坡度比自然安息角大,岩块将继续下滑,直到稳定为止.文中比较了计算的爆堆尺寸和实测的爆堆尺寸,同时讨论了炮孔倾角和延时间隔的影响.
Radial compressive strain waves occur in the rock around the blasthole after detonation of explosives in the blasthole, which results in radial cracks in the rock around the blasthole. Radial compressive strain waves encounter during propagation And the interface reflects the radial tensile wave, while the reflected wave and the incident wave are superposed with each other, which causes the radial crack to extend, especially when the radial crack and the reflected wave propagate perpendicularly Obviously, the detonation gas product is squeezed into the torn cavity wall fissures, which continue to produce compression in the fissure intergranular or pyramidal wedge, the fissures continuing up to the free surface.The mixture of gas and rock then continues along the minimum resistance line The direction of freedom to move until the release of free surface pressure of all gas release so far.Based on the horizontal and vertical component of the drum speed observed by the high-speed camera, you can calculate the size of the rock to obtain the impulse.Using the drum speed can also calculate the rock’s trajectory.If the rock The blocks do not collide with each other in flight until they collide with the ground or with other stationary objects, and if the rock falls to a greater extent than the natural angle of rest, the rock mass Will continue to decline until it is stable.The article compares the calculated size of the blast and the actual size of the blast, and discusses the influence of the angle of the blasthole and the delay time.