硬岩顶板切顶留巷围岩变形分区补强控制研究OA北大核心CSTPCD

[Objective]The traditional wide coal pillar mining method in SENDAYUAN coal mine leads to tense mining succes-sion and serious surrounding rock deformation problems.Cutting roof and leaving roadway technology can optimize roadway sup-port conditions,improve coal mining efficiency,and promote efficient and safe production in coal mines.[Methods]Taking 10101 working face of No.1 coal seam as the research object,FLAC3D numerical simulation software was used to systematically analyses the effects of cutting roof height,cutting roof angle,and grouting reinforcement depth on the stress and deformation in-side internal coal gang,goaf,and the roof during roadway drivage,pre-cracking cutting and cutting and leaving the roadway.And determine the best cutting roof and staying roadway schemes.On this basis,further simulation analyses the surrounding rock deformation in different areas in the front and back of workings.It is proposed that,0～30 m in front of workings as over-ad-vanced reinforcement area,adopting the joint support of"high pre-stressing anchor cable+monobloc with articulated roof beam".0～100 m behind the working as the lagging reinforcement area,adopting the joint support of"I-beam+monolithic pil-lar",and at the same time,the gangue gang is reinforced by grouting.And the effectiveness of the zonal reinforcement measures was verified through engineering applications.[Results]The result show that the best roof cutting and retaining roadway program for the cutting roof height 6 m,cutting roof angle 15°,grouting reinforcement depth 1 m.The actual project of 10101 working face,the final amount of the top and bottom of the roadway plate is 155 mm,two gangs is 84 mm,are in line with the require-ments of the use of mines,verifying that the cutting roof and staying roadway technology has a good effect.[Conclusion]The re-sult show that the cutting roof and staying roadway technology can effectively solve the perimeter rock deformation problems exist-ing in the traditional wide pillar mining method.However,the implementation of this technology is greatly affected by cutting roof height,cutting roof angle and gangue gang grouting reinforcement depth,which need to be combined with numerical simulation and site conditions for specific determination.Overall,cutting roof and staying roadway technology and partitioned reinforcement control measures have significant effect on the control of surrounding rock deformation,which provides valuable experience for coal mining under similar conditions,and thus has a broad application prospect.