沿空掘巷合理窄煤柱宽度确定与围岩控制技术

Rational width of narrow coal pillar and control technology of surrounding strata at roadway driven along goaf

进一步掌握沿空掘巷围岩控制技术.以枣泉煤矿12203工作面为研究对象,通过理论计算与数值模拟相结合的方法,确定窄煤柱的宽度为6 m,以沿空掘巷围岩大、小结构的稳定性为理论基础,认为解决沿空巷道围岩稳定问题必须使得围岩小结构与其外部大结构保持相互协调,而保持小结构的稳定性是沿结果表明:空掘巷稳定的根本,根据围岩强度强化理论,采用高强度高预应力锚网索联合支护,并在窄煤柱侧进行注浆加固.经过现场工业性试验,该方法能够有效控制巷道的变形,实现该类巷道的稳定.

Roadway driven along goaf is a key method for improving coal resource recovery. In order to further understand the surrounding rock control technology at a roadway driven along goal, an experimental study has been conducted at 12203 working face in Zaoquan coal mine. The rational narrow coal pillar width is determined as 6m wide by using the method of theoretical calculation and numerical simulation. Based on the big and small structure theory, the key approach for maintaining surrounding rock stability at roadway driven along goal is to keep the coordination between big and small structures while to maintain the small structure stability is fundamental. According to bolting surrounding strength reinforcement theory, the combination of supports of cable, mess, anchor with high strength and high pretension has been applied. In addition, the grouting at narrow pillar wall has been used to strengthen the support. The industrial case study demonstrates that the surrounding rock deformation can be effectively controlled, and the surrounding strata stability at roadway can be achieved by using the support technology developed.