Study on Blasting Effect of Uncoupled Parameters on Ignimbrite
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摘要: 为分析不耦合参数对熔结凝灰岩爆破效果的影响，运用ANSYS/LS-DYNA 建立有限元分析了不耦合介质、径向不耦合系数和轴向不耦合系数对隧道施工的影响。研究发现，随着不耦合系数的增加，岩体的有效应力强度和孔壁压力峰值均在逐渐降低。岩体损伤区域随着轴向不耦合系数的增加呈现先增加后降低的状态，损伤区域在不耦合系数为2.00 时达到峰值。水可以加速爆轰波的传播速度，降低传播过程中爆炸能量的衰减，水不耦合的能量传递效果更佳。针对熔结凝灰岩地层，建议爆破装药结构采用水不耦合方式，炮孔的径向不耦合系数kd=2.00，轴向不耦合系数kl=2.00。通过现场应用情况来看，采用推荐的不耦合装药结构参数取得的爆破质量良好，经济效益显著。Abstract: To analyze the influence of decoupled parameters on the blasting effect of ignimbrite, ANSYS /LSDYNA was used to establish the fi nite element method to analyze the infl uence of decoupled medium, radial decoupled coefficient and axial decoupled coefficient on tunnel construction. It is found that the effective stress intensity and the peak pressure of the hole wall decrease gradually with the increase of the decoupling coeffi cient. The damage area fi rst increases and then decreases as the axial decoupling coeffi cient increases, and the damage area reaches the peak when the decoupling coeffi cient is 2.00. Water can accelerate the propagation speed of detonation wave, reduce the attenuation of explosion energy in the propagation process, and the energy transfer eff ect of water decoupling is better. For the ignimbrite formation, it is suggested to adopt the water decoupling method during the construction, with the radial decoupling coeffi cient kd=2.00 and the axial decoupling coeffi cient kl=2.00. According to the fi eld application, the blasting quality is good and the economic benefi t is remarkable by using the recommended structural parameters of uncoupled charge.
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Key words:
- blasting /
- decoupled charge /
- ignimbrite /
- simulation
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