摘要
为优化疏水钻孔布置与设计,提高钻孔疏放水实效,对开滦东欢坨矿北二采区8煤层顶板含水层疏水孔的出水规律性开展研究。理论分析了向斜仰起端构造控制下8煤层顶板充水含水层段赋存与富水规律,统计了32个疏水钻孔疏水量及其6个影响指标,研究了疏水量―时间动态特征、疏水量与影响因素之间的相关性。结果表明:针对8煤层顶板煤5以上0~30m范围内的沿倾向顺层水力联系好,沿走向水力联系差的直接充水含水层段,宜沿巷道走向分散布设钻窝,上下巷道钻窝宜错列布置;6个指标中钻孔的位置、钻孔初放水时间对钻孔出水量影响最为显著,钻孔与裂隙发育方向的关系对出水量也有明显影响;该区域疏水超前时间宜为8~10个月。
In order to optimize the layout and design of drainage boreholes,enhance the drainage efficiency,the water drainage law was studied for No. 8 coal seam roof in No. 2 north district of Donghuantuo Coal Mine. Theoretical analysis was carried out on the water enrichment law of water-filled aquifers in No. 8 coal seam roof under the control of syncline structure. Statistics was done on water drainage yield of 32 drainage drillings and 6 influence factors. Yield-time dynamic feature,and correlation coefficient between drainage yield and influence factors were studied. The results show that,the mining fracture zone will conduct the aquifers above No. 5 coal seam; aquifers 0 ~ 30 m above No. 5 coal seam are drained to decrease its water head of geological structure developed,hydraulic connection is good along the dip and poor along the strike of stratum. It is appropriate to arrange drill socket scattered along the roadway,while staggered in upper and lower roadway. Among the 6 indicators,borehole location and the initial drainage time have the most significant effects on borehole water yield. The relationship between borehole direction and the fracture strike direction also have significant effect on borehole water yield. Advance drainage time shall be 8 to 10 months.
出处
《煤炭工程》
北大核心
2017年第1期67-70,共4页
Coal Engineering
基金
河北省自然基金"司家营矿区基岩风化带渗透性动态研究"(D2015209327)
关键词
顶板含水层
疏水钻孔
疏放水
富水规律
roof aquifers
drainage boreholes
water drainage
law of water abundance
