采动应力下覆岩导水裂隙带发育规律研究

Study on The Development Law of Water-conducting Fracture Zone in Overburden Rock under Mining Stress

为探究山西煤炭运销集团三元微子镇煤业15105工作面覆岩导水裂隙带发育规律,采用相似模拟试验、钻孔窥视与声发射技术进行研究。结果表明:15105工作面覆岩非对称性破断现象明显,裂隙带呈现“梯形”+“倒V形”分布,声发射事件主要发生在上方岩层约500 mm以内,沿着“梯形”的右腰线和上顶边继续扩展。钻孔窥视表明裂隙带总高度为41.72 cm,对应实际高度为83.44 m。

In order to explore the development law of the overlying rock water-conducting fracture zone in the 15105working face of Sanyuan Weizi Town Coal Industry,similar simulation experiments,borehole observation,and acoustic emission techniques were used for research.The results show that the asymmetric fracture phenomenon of the overlying rock in the 15105 working face is obvious,and the fracture zone presents a "trapezoidal" and "inverted V-shaped" distribution.The acoustic emission event mainly occurs within about 500 mm of the upper rock layer,and continues to expand along the right waistline of the "trapezoidal" and top edge.Borehole observation shows that the total height of the fracture zone is 41.72 cm,corresponding to an actual height of 83.44 m.