有效抽采半径与考察区域形状及布孔间距的关系研究

Study on Relation Between Effective Extraction Radius and Study Area Shape and Borehole Spacing

为了解决测定钻孔有效抽采半径过程中存在的问题,如考察区域形状对测定有效抽采半径的影响、现场大面积施工钻孔布孔间距与有效抽采半径的定量关系,采用理论推导的方法对相应的问题进行了修正。结果表明:不同的考察区域对应不同的有效抽采半径计算公式,分别就考察区域为长方体、圆柱体的情况,推导出了相应的有效抽采半径计算公式;现场大面积施工瓦斯抽采钻孔时,受相邻钻孔抽采叠加的影响,其有效抽采半径较单个钻孔有所增大,约为单个钻孔有效抽采半径R的1.34倍。

In order to solve the problems in the process of determining the effective extraction radius of borehole, for example, the influence of the study area shape on the effective drainage radius measurement of borehole, quantitative relation between borehole spacing and effective extraction radius in large-area borehole construction on the site, the corresponding problems are corrected by theoretical derivation. The results showed that different study areas correspond to the calculation formulas with different effective drainage radius, and the corresponding effective drainage radius formula is deduced in case of the rectangular and cylinder study areas; in large-area construction of gas extraction borehole on the site, due to influence of extraction overlapping of neighboring boreholes, the effective extraction radius enlarges relative to single borehole, being about 1.34 times of the effective extraction radius R of single borehole.