为提高新元煤矿 3502 综采工作面瓦斯抽采钻孔的封孔效果,通过数值模拟及钻屑法,确定其合理的封孔长度应在 15m左右;对封孔材料进行了优化,可大幅提高封孔效果.现场试验结果表明,水泥砂浆封孔质量较差,新型封孔材料15m及20m封孔长度下的瓦斯抽采效果基本一致,最终确定合理的封孔长度为 15 m.
Reasonable Sealing Length of Coal Seam Gas Extraction Boreholes in Xinyuan Coal Mine
In order to improve the sealing effect of gas extraction drilling holes in 3502 fully-mechanized mining face of Xinyuan Coal Mine,a reasonable sealing length of about 15 m was determined through numerical simulation and drilling chip quantity method;and the sealing material has been optimized,which can significantly improve the sealing effect.The on-site test results indicated that the sealing quality of cement mortar was poor,and the gas extraction effect was basically the same under the sealing length of 15 m and 20 m with the new material.Finally,a reasonable pre drainage hole sealing length of 15 m was determined.
万方数据
维普
