不偶合装药爆破的试验研究

在试验的基础上，探讨了不偶合装药爆破效果与不偶合系数之间的关系。试验中发现，当不偶合系数为2．0时，平均块度与偶合装药时几乎完全相同，面粉矿率及大块率则较小。当不偶合系数大于等于2．0时，随着不偶合系数的增大，粉矿率减小，大块率上升．应变波的测试结果表明，随着不偶合系数的减小，应变波幅值逐渐增大．通过裂缝扩展试验，发现裂缝扩展速度随着不偶合系数的增大逐渐减小．以上表明，爆破效果最终由应力波和爆生气体两者的共同作用决定．

EXPERIMENTAL STUDY ON ROCK BLASTING WITH DECOUPLING CHARGES

In this paper, the relationship between blasting effects and decoupling coefficients is studied through experiments. In these experiments, the mean size of broken rocks at 2 of decoupling coefficient is almost the same as one at 1 (coupling charge),however, the ratios of powdered and macro rocks are lower. When the decoupling coefficient is greater than or equal to 2.0, the powdered rock ratio decreases and the macro rock ratio increases with increasement of decoupling coefficient. The measuring of strainwaves has shown that the magnitude of strain wave increases with decrease ofdecoupling coefficient. Through crack propagation experiments, we have found that crackpropagation speed decreases with increasement of decoupling coefficient. From above,it is suggested that blasting effects are dependent upon combined action of strain waveand explosion gas.