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为了揭示聚能管装药爆破的细观机理,基于数值计算的可重复性及经济型,提出了采用数值模拟的方法,对聚能管不耦合装药预裂爆破进行研究.在相邻炮孔中心处,应力波发生叠加,有效应力峰值为93MPa;切缝方向孔壁的有效塑性应变为8.2%,为管壁外侧受保护孔壁的2倍.结果表明:聚能管对能量传播的导向以及对侧面岩壁的保护有显著作用.采用现场试验,对模拟结果进行验证.聚能管预裂爆破,破碎块度均匀,断面平整光滑,半眼痕率达到100%.
In order to reveal the meso-mechanism of energy-charged tube blasting, based on numerical calculation of repeatability and economy, a method of numerical simulation is proposed to study the pre-cracking blasting of energy-dissipating tube in uncoupled charge. The effective stress peak value is 93MPa, the effective plastic strain of the cell wall in the direction of kerf is 8.2%, which is twice as large as that of the protected cell wall on the outside of the pipe wall.The results show that the orientation of the energy tube and the Side wall protection has a significant effect.Using field test to verify the simulation results.Combined tube pre-cracking blasting, broken pieces of uniform, smooth and smooth section, half-eye marks rate of 100%.