煤层瓦斯合理预抽期研究

摘要

A rational gas Pre-drainage model was established by analyzing the influence factors of the borehole gas drainage effect and according to the measured result of the rational drainage radius in the working face in a mine in Shanxi Province. Based on the actual conditions of the face,the Pre-drainage rate and time in different borehole sPacing were obtained. It was determined that the reasonable borehole sPacing in this face was 2. 5~3. 0 m and the reasonable Pre-PumPing time was 210 d when the alternative mining,drainage cost and other factors were taken into consideration,this thus Provided a reference for the determination of the reasonable borehole sPacing and Pre-PumPing time in the same seam mining in this mine.%根据钻孔抽采效果影响因素分析，以及山西某矿工作面合理抽采半径的测定结果，建立了合理的煤层瓦斯预抽期评价模型。根据该工作面实际条件，得出不同钻孔间距对应的预抽率及预抽时间。考虑采掘交替、抽采成本等因素，确定该工作面合理钻孔间距为2.5~3.0 m，合理预抽期为210 d，为该煤矿同煤层开采钻孔间距及预抽期的确定提供一定的借鉴。