Roof control technology for final mining of working face with double withdrawal channel

YANG Chao

doi:10.11799/ce202311044

Abstract：In response to the severe of rock pressure during the final mining period of fully mechanized mining face in the Shaanxi and Inner Mongolia mining area,as well as the large deformation and difficulty in controlling the surrounding rock of the withdrawal passage,theoretical analysis and engineering practice were carried out to study the influence of different pressure positions and suspended roof structures on the stability of the withdrawal channel.Taking the final mining of the 30201 working face of a certain mine as the research background,control technologies such as roof cutting pressure relief,pressure-yield mining,reasonable control of advancing speed,and strengthening of support for the withdrawal channel were adopted,and 30201 working face was withdrawn safely.Engineering practice showed that hydraulic fracturing construction can accelerate the breaking and sinking of roof rock layers,reduce the strength of final mining pressure,and reduce the support pressure by 10.6%compared with the unfractured area;When the working face is connected,the main roof fracture position is above the coal pillar of the main and auxiliary withdrawal channels,and during the connection period,it is in the non-weighting stage,achieving high-quality connection of the 30201 working face.