Chamber and overhand cut combined cut-and-filling stoping method in pre-roof-protecting stage

• Main Authors: LYU YINGLEI, HE SHUNBIN, ZHANG GUODONG, LIU CHENGPENG, SUN JUNTAO, DU HAO, YU CHANGXIAN, LI WEI, XU ZIGANG, CHEN ZHUO
• Format: Patent
• Language: English
• Published: 19.08.2015
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; MINING; MINING OR QUARRYING; SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS

The invention relates to a chamber and overhand cut combined cut-and-filling stoping method in a pre-roof-protecting stage. The method comprises the following steps: dividing a middle ore body into panels along the trend of the ore body, further dividing the middle section into a plurality of sections in the vertical direction, and mainly adopting a footwall out-out-pulse traceless accurate mining mode; arranging chambers and pillars in the panels at intervals; recovering the chambers first, and adopting a sublevel open stoping method with subsequent backfilling; after recovering the chambers, recovering the pillars and adopting an overhand horizontal cut-and fill method for the pillars, and before recovering the chamber in stages, pre-supporting a long cable in advance for an upper panel in a sublevel upper panel supporting lane; pre-supporting the fore-set by using an anchor rod and a metal net in an air return cross gateway below the fore-set; when the pillars are recovered in layers, stopping mining when the pillar is 3m close to the main crack of the upper panel F1 in horizontal distance and reserving the panel as an upper panel roof-protecting ore of the sub layer, and when the lower layer is recovered, fully recovering the upper panel roof-protecting ore reserved in the previous layer, and meanwhile, reserving the upper panel roof-protecting ore in the lower sub layer; and sequentially circularly recovering and reserving the upper panel roof-protecting ore. By virtue of the method provided by the invention, safe, efficient and low-cost mining can be implemented for thick and large ores which are relatively broken.