水不耦合径向装药对预裂成缝效果影响分析.

In order to study the influence of air and water media on pre-crack blasting, the single-hole blasting damage of the marble HJC intrinsic model and the porous burst seam condition under different uncoupling coefficients were studied through LS-DYNA software. The results show that: 1) Under the same uncoupling coefficient, the damage range of water uncoupled charge is larger than that of air uncoupled charge. With the increase of the radial uncoupling coefficient, marble under the condition of the air uncoupling charge and water uncoupling charge damage range will gradually decrease. It can effectively protect the hole wall rock mass. 2) The stress propagation law of water uncoupled charge and air uncoupled charge is the same, but water uncoupled charge has a higher utilization rate of explosive energy than air uncoupled charge. 3) According to the rock conditions in this paper, the optimal blasting parameters are obtained, and a good pre-crack blasting effect is achieved in the field. [ABSTRACT FROM AUTHOR]