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钻孔爆破卸压是转移或释放高地压的有效措施。采用显式非线性动力分析有限元程序ANSYS/LS-DYNA与快速拉格朗日有限差分程序FLAC3D相结合的方法,动态模拟了硬岩巷帮钻孔爆破卸压过程,分析了不同施工条件对卸压效果的影响。结果表明:合理的钻孔深度处于支承压力峰值与支承压力区边界之间的中部位置;装药量越大,支承压力峰值降低越明显,装药量上限应确保爆炸产生的损伤区与巷道已有损伤区不贯通;钻孔间距越小,支承压力峰值降低越明显,钻孔间距下限应满足在确保不扩大巷道已有损伤区范围的前提下,钻孔之间能够形成基本贯通的塑性带。
Borehole blasting is an effective measure to transfer or release high ground pressure. The dynamic nonlinear finite element program ANSYS / LS-DYNA and the fast Lagrange finite difference program FLAC3D are combined to dynamically simulate the pressure relief process of drilling and blasting in hard rock roadway. The influences of different construction conditions on Effect of pressure relief effect. The results show that the reasonable depth of drilling is in the middle of the boundary between support pressure peak and support pressure zone. The larger the charge, the more obvious the decrease of support pressure peak. The upper limit of charge should ensure that the damage zone and tunnel And the damaged area can not be penetrated. The smaller the spacing of drilling holes is, the more obvious the peak of supporting pressure is reduced. The lower limit of drilling spacing should meet the requirement of ensuring that the existing damaged area of tunnel is not expanded, .