大采高超大断面切眼长锚杆锚索组合支护技术

Technology of long bolt and cable combined supporting in super large section cut in working face with large mining height

为了解决大采高工作面超大断面切眼的支护问题,在赵固二矿1105切眼导硐进行了顶板岩层结构精细探测和岩层移动规律研究,结果表明赵固二矿1105切眼顶板表面至深部呈现裂隙密集区、裂隙渐疏区、裂隙稀少区等特征,3.5m以上裂隙发育较少,顶板4～6m范围内为稳定岩层,据此提出了长锚杆锚索组合支护技术,并采用理论计算、计算机数值模拟方法对支护参数进行了优化设计。该方案在赵固二矿1105超大断面切眼进行了现场应用,监测结果表明该方案能够有效控制巷道围岩,长锚杆支护效果良好。

In order to solve the support problem of the super large section cut in with large cutting height, in 1105 cut pilot chamber of Zhaogu No. 2 Mine, the roof ture detection and the strata movement rule research were conducted. The results from surface to deep area of the roof of 1105 cut there present concentrated fracture working face strata struc- showed that area, gradu- ally sparse fracture area and rare fracture area, and the fracture above 3.5m is less and the rock stratum of roof within the range of 4~6 m is stable. Accordingly the author put forward the long bolt and cable combined supporting technology and optimized the design plan applying theoretical calculation and computer numerical simulation. The scheme has been applied in the field of 1105 super large section cut in Zhaogu No. 2 Mine. The monitoring results show that the scheme can effectively control the surrounding rock of roadway and the support with long bolt has good effec- tiveness.