Research on stability and control technology of gob-side entry retaining in old gully area
Taking 31116 and 31117 gob-side entry retaining in Jinjie Coal Mine as the research background,the stability and control technology of gob-side entry retaining in old gully are studied by using research methods of numerical calculation,theoretical analysis,and on-site monitoring.The research results show that the rock layers in the gully area are weak and prone to stress concentration,the original support strength is insufficient and the instability of the filling wall along the goaf is exacerbated.According to the reasons of empty roadway instability,the surrounding rock control scheme of controlling roadway by region is proposed,and the surrounding rock control scheme of active and passive support combined with reinforcement support is adopted.The field measurement results show that the maximum convergence rate of the section of gob-side entry retained under the old gully region is 3.70％,which meets the engineering requirements.
gob-side entry retainingstability of surrounding rockregional supportold gully area
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