水力割缝煤体多场耦合响应规律研究

1.中国矿业大学 煤矿瓦斯与火灾防治教育部重点实验室,江苏 徐州 221116; 2.中国矿业大学 安全工程学院,江苏 徐州 221116

瓦斯抽采; 水力割缝; 扰动裂隙; 影响半径; 多孔协同

Coupling response law of multi-field incoal seam after hydraulic slotting
LIN Bai-quan1,2,ZHAO Yang1,2,LIU Ting1,2,ZHENG Yuan-nan1,2,KONG Jia1,2

(1.Key Laboratory of Coal Methane and Fire Control,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China; 2.School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

gas drainage; hydraulic slotting; disturbed fractures; influencing radius; multi-borehole coordination

DOI: 10.13800/j.cnki.xakjdxxb.2017.0510

备注

针对水力割缝钻孔周围的扰动裂隙范围以及合理的布孔间距问题,文中建立了水力割缝煤体多场耦合模型。以杨柳矿特定的地质条件为基础,考虑应力场、裂隙场以及渗流场耦合效应,开展了水力割缝钻孔周围瓦斯流场演化数值模拟研究。结果 表明:水力割缝钻孔周围存在半径约为2 m的扰动裂隙圈,割缝孔周围瓦斯压力变化曲线存在“陡坡”现象。水力割缝钻孔瓦斯抽采的有效影响半径约为4.6 m,最适布孔间距约为7 m,与现场测试结果相吻合。多孔协同抽采30 d后,钻场控制区域均已消突,抽采效果理想。

Coal Multi-field coupling model of hydraulic slotting is established to ensure the range of borehole fractures and effective borehole arrangement.Based on Yangliu mine geological condition,numerical simulation is carried out to study the gas flow field evolution,considering the coupling effect of stress field,fracture field and seepage field.The results show that the range of disturbed fractures around the borehole is about 2 m,and the borehole gas pressure curve exists “steep slope” phenomenon.The effective influencing radius of gas drainage is about 4.6 m and the optimal hole spacing is about 7 m,which is consistent with field experiment.Drilling control field has eliminated outburst danger,which has an ideal effect under 30 days' multi-borehole coordination drainage.