水力冲孔后周围煤层应力分布规律研究
Study on Distribution Laws of Coal Seam Stress After Hydraulic Flushing
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摘要: 为研究水力冲孔后煤层应力分布规律,基于水力冲孔现场试验,采用RFPA2D-Flow软件模拟了水力冲孔后周围煤层应力变化过程,并分析了水力冲孔出煤量对煤层应力分布的影响。结果表明:水力冲孔卸压增透就是孔洞附近煤体应力降低,应力集中向煤体深部转移的过程。随着冲出煤量的增加,煤层应力集中现象越发明显,距离孔洞也越来越远,考虑到水力冲孔后煤层应力分布的影响,冲出煤量应在0.4~0.8 t/m范围为宜。Abstract: In order to research the coal stress distribution laws after hydraulic flushing, based on the hydraulic flushing field test condition, we use RFPA2D-Flow software to simulate the process of coal fracture after hydraulic flushing, and analyze the effect of the amount of coal from hydraulic flushing boreholes on seam stress distribution. The result indicates that hydraulic flushing pressure relief and permeability is a process that the coal around punching holes relieves pressure and stress concentration transfers to deep of coal. With the increase of the amount of coal from hydraulic flushing, the phenomenon of stress concentration is more obvious and the distance from flushing hole is more further, in consideration of coal stress distribution in hydraulic flushing coal seam, the amount of coal from hydraulic flushing should be from 0.4 t/m to 0.8 t/m.
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