不同切槽孔方向爆生裂纹扩展行为试验与分析

为研究炮孔不同切槽方向对爆生主裂纹动态扩展行为的影响,采用数字激光动态焦散线实验系统,研究了5种不同切槽方向时爆生裂纹扩展及相互影响规律。研究结果表明:1切槽方向夹角角度不同,爆生主裂纹的扩展轨迹有明显差异。2切槽方向夹角度数越大,则在爆生主裂纹扩展中期裂纹扩展速度越大。3切槽方向夹角为90°,135°,180°试件的爆生主裂纹尖端KdI会出现第2次峰值。

Experimental analysis on behaviors of blast-induced crack propagation in different notched borehole orientations

A digital dynamic caustic experimental system was used to study the effect of different notched orientations to the blast-induced main crack propagation behavior.Five different notched orientations were studied on how they influence blast-induced crack propagation and interaction.The result proves that the difference of included angle has obvious effect on the blast-induced main crack propagation trajectory.The larger the included angle of notches orientations,the larger the crack propagation velocity in the medium term of blast-induced main crack propagation.When the included angle of notched orientations are 90°,135°and 180°,the second peak values in the blast-induced main crack tip will appear.