永红井田下组煤层有效隔水层及底板突水危险性评价研究

Risk Evaluation of Water Inrush from Effective Water-Retaining Layer and Floor of Coal Seam of Yonghong Mine Field

与以往研究的不同之处,在于本研究通过之前钻孔及本次施工钻孔,从下组煤层底板至峰峰组顶面隔水层以及奥灰顶部岩层相对隔水层两个方面来分析计算,综合考虑了永红井田下组煤的有效隔水层。通过分析计算得出了下组煤层底板有效隔水层厚度区间值为45.88~64.32 m,并在此基础之上对下组煤层底板突水危险性进行了评价,得出了永红井田全区突水系数小于0.06 MPa/m,表明其突水威胁性小。

The difference from previous studies is that this study analyzes from the previous drilling and the current drilling, from the bottom coal seam to the top impervious layer of the Fengfeng Formation and the relative impervious layer of the top layer of the Austrian lime. The calculation takes into account the effective water barrier of the coal formation under the Yonghong mine field. Through analysis and calculation, the effective interval thickness of the lower coal seam floor is 45.88~64.32 m. Based on this, the risk of water inrush from the lower coal seam floor is evaluated, and the whole area of Yonghong mine field is obtained. Water inrush coefficient is less than 0.06 MPa/m, indicating that its water inrush threat is small.