Research on advanced support technology for sealing holes and grouting of roadway roof in fault fracture zone

LI Xuebin; ZHU Xingzhi; LIU Dinggui; ZHENG Yun; LIU Youjiang

doi:10.19956/j.cnki.ncist.2025.05.004

Abstract：In response to the problems of broken surrounding rock and the susceptibility of the roof to collapse in the goaf of fault zone roadways,this study focuses on the track downhill roadway of the 25th mining area of Changcun Coal Mine as the engineering context.We propose an advanced support technology that integrates anchor rod sealing and grouting during roadway excavation.This innovative approach combines advanced an-chor rod prestressing with surrounding rock grouting to establish a reinforced roof zone ahead of the excavation face,thereby enhancing the stability of the roof in the goaf area.Furthermore,we derive the relationship be-tween critical grouting pressure and effective sealing lengthby incorporating the characteristics of a bag-type sealing structure.Numerical simulations indicate that the implementation of this advanced support technology results in a 58％reduction in the displacement of the roadway roof and a 68％reduction in the surrounding rocks.Additionally,the depth of the plastic zone in the roof decreases from 1.7 m to 0.7 m.Field industrial tests and mining pressure monitoring reveal that the deformation of the roof rock separation in the advanced support section is significantly less than that in the conventional support section.The axial force of the anchor rod and cable stabilize at approximately 15.8 kN and 132.2 kN,respectively,representing reductions of 70％and 36％.Consequently,the safety factor of the roadway is significantly improved.Thus,the advanced anchor rod sealing and grouting reinforcement technology for the roof of fault fracture zone roadway is advantageous for ensuring safe and efficient operations in these challenging environments.