Practice of Dynamic Pressure Jointed Narrow Coal Pillar Anchor Grouting Support Technology in Shengping Coal Mine
Aiming at the problem of severe shrinkage and deformation of the cross section of a section of isolated island working face in Shengping Coal Mine,the characteristics of the fractured structure of the overlying rock mass in the roadway excavation along goaf are analyzed,the control mechanism of anchor rod support suspension theory,composite beam theory and others on the surrounding rock of the experimental roadway excavation along goaf is revealed,the technical parameters of anchor rod support for the roadway excavation along goaf are obtained,the weak area for stable control of the surrounding rock of the narrow coal pillar roadway excavation along goaf in the isolated island working face is determined,and grouting reinforcement scheme for its weak area is proposed.By using theoretical analysis,mechanical analysis,numerical simulation,and on-site measurement methods,its design scheme is analyzed and verified through experimental effects.The on-site measurement shows that the displacement of the two sides and the roof increases from 12 mm and 20 mm to 127 mm and 158 mm respectively,and gradually stabilized.The maximum value of the top anchor rod force gauge is 28.4 MPa,and the maximum value of the side anchor rod force gauge is 13.5 MPa.The anchor grouting support effect is significant,which can effectively control the deformation of the surrounding rock of the narrow coal pillar roadway excavation along goaf in the isolated island working face of Shengping Coal Mine.
narrow coal pillarcrack propagationanchor rod supportgrouting reinforcement
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