Cuncaota Coal Mine, Shenhua Shendong Coal Group Corporation Limited Bulianta Coal Mine, Shenhua
Shendong Coal Group Corporation Limited

基于特大断面开切眼掘进、支护和综合利用困难的问题,以神东煤炭集团补连塔煤矿8 m大采高综采工作面开切眼为例,研究了特大断面开切眼掘进技术,结合现场实际地质条件及支架参数研究确定了特大断面开切眼支护所需锚杆和锚索长度、直径以及间排距等参数,研究确定了工作面初采强制放顶采用水力压裂工艺时孔口直径、孔口深度、孔口角度以及水压强度等参数。结果表明,特大断面开切眼掘进技术、断面支护参数以及后续水压预裂放顶的运用是安全可靠的,应用该掘进技术和支护参数可保证开切眼围岩稳定,可以满足8 m高支架安装和初采,水压预裂放顶效果明显,为类似地质条件下的大断面巷道掘进与支护以及后续综合利用提供借鉴。

Based on the problems of excavation, support and comprehensive utiliation of large section open-off cut, taking ultra large section open-off cut of 8 m | arge mining height fully-mechanized coal mining face in Bulianta Coal Mine as the study object, the parameters, such as the length, diameter and spacing of the anchor and anchor cable for the large section open-off cut support were determined by the actual geological conditions and the parameters of hydraulic support. The parameter s, such as the diameter of the hydraulic fracturing hole, the depth of the orifice, the angle of the orifice and the hydraulic pressure were adopted in the working face. Th e results showed that the application of the large section open-off cut technology, the cross-section support parameters and the subsequent hydraulic pre-cracking top was safe and reliable .Application of the tunneling technology and support parameters could ensure that the open-cut eye rock stability, to meet the 8 m hydraulic suppo rt installation and initial mining requirements, hydraulic pre-cracking caving effect was obvious, which could provide some references for large-section roadway excavati on and support and subsequent comprehensive utilization under similar geological conditions.