新建千米井筒留设小保护煤柱与抗变形技术

Technique for protection of new shafts over 1000-m-deep with small-sized safe pillar and anti-deformation technique

针对矿井深部新建井筒面临的压煤量剧增难题,采用现场试验、数值模拟计算、理论研究等方法,提出了新建井筒小保护煤柱的留设方法和计算依据,留设的小保护煤柱必须满足能够有效地减小井筒的移动变形量,保证其煤柱的稳定性和对称性;分析了新建井筒在小保护煤柱条件下的受力和采动变形规律,系统研究了新建井筒抗变形技术,包括整体规划、柔性措施和刚性措施,刚柔结合用于吸收和抵抗岩层的移动与变形。研究成果在平煤四矿新建进风井、回风井中得到了应用,实践证明,新建井筒在小煤柱保护条件下采用抗变形技术措施取得了良好的技术、经济效果。

To solve the problem of huge coal protective pillar induced by new shaft in deep depth area, the methods for the design of small-sized safety pillars were proposed based on the result of field experiment, numerical simulation cal- culation and theoretical study. The safe pillars were so designed as to be able to effectively reduce the deformation of the shafts and ensure the stability and symmetry of pillars. Force and deformation law of new shaft protected by small- sized safe pillar was analyzed by numerical simulation, some problems needing attention in the shaft protection were proposed. A systematic study was made on the techniques for increasing the shafts＇ deformation-resistant capability through making overall planning and using rigid and flexible structural measures to effectively absorb and resist the movement and deformation of strata. As evidenced by practical result for the protection of a pair of new anti-deforma- tion downcast and upcast shafts at the No. 4 Coal Mine under Pingdingshan Tian＇ an Coal Mining Co. , Ltd. , the design of the safe pillars and the anti-deformation techniques adopted for protection of the 2 shafts have achieved remarkable teehno-economical effects.