含控制孔切缝药柱爆破增透松软煤层数值模拟研究
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安徽理工大学 安全科学与工程学院

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国家自然科学(52074013);安徽省教育厅高校研究生科研(YJS20210396);安徽理工大学2022年研究生创新(2022CX1003)。


Numerical Simulation Study on Permeability Enhancement of Soft Coal Seam by Blasting with Slit Charge with Co-ntrol Hole
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College of Safety Science and Engineering,Anhui University of Science and Technology

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    摘要:

    为了探明切缝药柱与控制孔耦合作用下的爆破增透效果,运用ANSYS/LS-DYNA数值模拟软件建立了数值分析模型并求解,得到了切缝药柱装药爆破与控制孔共同作用下松软煤层增透的裂隙扩展及应力分布特征。结果表明:切缝药柱和控制孔耦合作用下的定向控制断裂松软煤层效果优于单切缝药柱的爆破效果。应力波传播到控制孔时发生波的反射叠加,拉应力峰值上升,爆生裂纹偏转现象显著。控制孔对裂隙扩展起导向作用,进一步促进了裂隙的发育和扩展。研究结果可为爆破增透松软低透气性煤层工程实践提供一定的理论依据和数据支撑。

    Abstract:

    In order to explore the anti-reflection effect of blasting under the coupling action of slit charge pack and control hole, a numerical analysis model was established and solved by using ANSYS/LS-DYNA numerical simulation software, and the crack propagation and stress distribution characteristics of anti-reflection effect on soft coal seam under the joint action of slit charge column blasting and control hole were obtained. The results show that the blasting effect of directional control of fractured soft coal seam under the coupling action of slit charge pack and control hole is better than that of single slit charge column. When the stress wave propagates to the control hole, the reflection superposition of the wave occurs, the peak of tensile stress increases, and the deflection of the burst crack is obvious. The control hole plays a guiding role in crack propagation and further promotes the development and propagation of crack. The research results can provide theoretical basis and data support for the engineering practice of soft and low permeability coal seam with blasting permeability improvement.

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  • 收稿日期:2023-03-17
  • 最后修改日期:2023-03-26
  • 录用日期:2023-03-28
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