煤层钻孔损伤区半径的影响研究

发布时间：2018-05-01 19:40

本文选题：煤体 + 损伤区半径　；参考：《煤矿安全》2017年03期

【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 problem of hole collapse in coal seam has restricted the efficiency of gas extraction and seriously affected the safe production of coal mine. It is of great significance to study the radius of damage zone of coal borehole in order to solve the problem of caving hole in borehole drainage of coal seam. Four kinds of coal samples with different hardness were selected and tested by uniaxial compression, Brazilian cleavage and stiffness coefficient, and the basic mechanical parameters of each coal sample were obtained. Based on this, the mechanical model of borehole in coal seam is established, and the influence of in-situ stress, lateral pressure coefficient and rigidity coefficient on the radius of damage zone of coal seam is analyzed numerically. The results show that: with the increase of in-situ stress, the radius of the damage zone decreases gradually and the horizontal direction increases, the radius of the damage increases gradually and the horizontal direction decreases with the increase of the lateral pressure coefficient. The radius of the damage zone decreases gradually with the increase of the coefficient of coal solidity.
【作者单位】：河南理工大学土木工程学院;
【基金】：河南省科技攻关计划资助项目(142102310268) 河南省高校科技创新团队支持计划资助项目(15IRTSTHN029)
【分类号】：TD712.6

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