煤层钻孔损伤区半径的影响研究
Influence Study on Coal Seam Drilling Damage Radius
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摘要: 煤层钻孔塌孔等问题制约了瓦斯抽采效率，严重影响着煤矿的安全生产，研究煤体钻孔损伤区半径问题，为解决煤层钻孔抽采的塌孔问题具有重要意义。选取了4种不同硬度的煤样，分别进行单轴压缩、巴西劈裂和坚固性系数测定试验，得到各煤样的基本力学参数。基于此，建立了煤层钻孔力学模型，数值分析了地应力、侧压系数和坚固性系数对煤层钻孔损伤区半径的影响。研究结果表明：随着地应力增大，煤体钻孔损伤区半径竖直方向逐渐减小、水平方向逐渐增大；随着侧压系数增大，竖直方向损伤半径逐渐增大，水平方向逐渐减小；随着煤体坚固性系数增大，钻孔损伤区半径逐渐减小。Abstract: The collapse problem of coal seam drilling hole which restricts the efficiency of gas drainage and seriously affects the safety of coal production. Studying the damage zone radius of coal body drilling has important significance for solving the collapse hole problems of coal seam hole drainage. Tests were carried out to determine the basic mechanical parameters of 4 kinds of coal samples, which were measured by uniaxial compression, Brazil splitting and firmness coefficient; and the basic mechanical parameters of coal samples were obtained. Based on this, we established the mechanical model of coal seam drilling, the numerical analysis of the influence of ground stress, lateral pressure coefficient and firmness coefficient on coal seam drilling damage zone radius. The study shows that the radius of vertical direction of coal drilling damage zone decreases and the horizontal direction increases gradually with the increase of ground stress; with the increase of lateral pressure coefficient, the vertical damage radius increases gradually, the horizontal direction decreases gradually; with the increase of coal firmness coefficient, the drilling damage zone radius decreases gradually.
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Keywords:
- coalbody /
- radius of damage zone /
- ground stress /
- firmness coefficient /
- numerical simulation
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