Study on the overlying strata movements and stability control of the retained goaf-side gateroad

Recently, Y type gateroad layout, which is based on a retained gob-side gateroad (RGG), is being widely used for the purposes of optimizing ventilation system, increasing coal recovery rate, etc. The RGG, however, suffers several engineering disturbances including roadway excavation and two adjacent longwall panels mining during its whole serving life, which makes the stability control of this kind of roadway is difficult. In order to have a deep insight of this issue, a novel simulation software referred to as Realistic Failure Process Analysis (RFPA) is employed in present study to analyze the overlying strata movements by which the redistributed stress is induced. And then, three RGG packfillings locations are compared and the most appropriate one is selected. After that, a combined roadway supporting method involving “three-high” rock bolts and novel grouting cable bolts are put forward to maintain the RGG stability. Finally, engineering practice is carried out in the Pan Yidong deep underground coalmine, and the results of field measurements indicate that the RGG supported by the proposed roadway stabilizing method meets all anticipatory mining goals.