基于ANSYS的耦合装药系数对煤层预裂爆破增透效应数值模拟
Numerical Simulation of Coupling Charge Coefficient on Permeability Increasing Effect of Deep Hole Pre-splitting Blasting Based on ANSYS
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摘要: 为研究不同耦合装药系数条件下,深孔预裂爆破对煤层增透的效果,利用ANSYS/LS-DYNA建立了4组不同耦合装药系数的爆破模型并进行模拟;得出裂隙发育图、应力云图及x方向的应力时程图。分析结果得以下结论:耦合系数K=1.5时的裂隙扩展长度较K=1.0时长;不耦合装药结构使有效应力分布更均匀,随着耦合装药系数的增大,有效应力范围减小,均小于完全耦合时的情况;适当增大耦合装药系数,可提高能量利用率,增透的效果更好,继续增大耦合装药系数,则裂隙不向控制孔延伸。Abstract: In order to study the effect of deep hole pre-splitting blasting on coal seam under different coupling charge coefficients, four sets of blasting models with different coupling charge coefficients were established and simulated by ANSYS / LS-DYNA. The stress nephogram and stress time history in x direction are obtained; the results of the analysis are as follows: when K=1.5, the crack propagation length is longer than that K=1.0; the uncoupled charge structure makes the effective stress distribution more uniform; with the increase of the coupling charge coefficient, the effective stress range decreases, which is less than that in the case of complete coupling; appropriately increasing in coupling charge coefficients can improve the energy efficiency and achieve the better permeability increasing effect; continuously increasing the coupling charge factor, the cracks do not extend to the control hole.
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