Abstract
It is of significant importance to mining engineering by investigating the control method and technology of reducing mining damage to overlying strata. A novel no-pillar longwall mining method (NPLM) by roof cutting technology (RCT) was proposed in China, it can mitigate mining damage by increasing the volume of gangue bulking through RCT theoretically. Considering the NPLM by RCT industrial test as a case study, this paper conducted a comparative analysis of the gangue bulking characteristic at different positions in roof-cutting working face employing in-situ monitoring. The results demonstrated that the RCT can significantly increase gangue bulking and minimize mining pressure concentration. Based on the results of in-situ monitoring, the failure mechanism of goaf roof rock under different mining methods was further studied by theoretical analysis and numerical simulation. The analysis results indicated that RCT can create a free surface in the goaf roof, greatly reducing the minimum principal stress and increasing the failure range of roof rock. It can enhance the height of caving zone, preserve the integrity of overlying strata and reduce the subsidence of surface. This study has significant consequences for the security, productivity, and environmental protection of underground coal mines.
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