水力冲孔有效影响半径变化规律研究

Study on Change Regulation of Effective Influence Radius in Hydraulic Flushing

水力冲孔技术是在石门揭煤和煤巷掘进前实现区域消突的措施之一,由于能实现快速高效的消突而被广泛应用。合理的水力冲孔技术参数是达到水力冲孔效果的技术保证,以潘二矿为研究背景,考察了瓦斯抽采钻孔和水力冲孔措施的有效影响半径,结果表明:经过30 d的抽采,有效影响半径分别为1.5,5.5 m,水力冲孔的有效影响半径提高了2.67倍。以此为基础,研究了水力冲孔措施不同冲孔直径对应的有效影响半径及其变化规律,得出水力冲孔直径与有效影响半径满足指数关系。

Hydraulic flushing technology is one of the measures to realize regional outburst elimination before rock cross-cut coal uncovering and coal roadway driving. Hydraulic flushing technology is widely used for achieving fast and efficient elimination outburst. The reasonable technical parameters are guaranteed to reach the effect of hydraulic flushing. Taking the Pan＇er Coal Mine as background,the effective influence radius of gas drainage boreholes and hydraulic flushing were examined in this paper. Results are 1.5 m and 5.5 m in 30 days ,which proves the remarkable effect of hydraulic flushing. On this basis ,the change regulation of hydraulic flushing effective influence radius in different flushing hole diameter were studied in this paper, and it was obtained that hydraulic hole diameter and effective influence radius accord with exponential relationship.