Abstract: The entry at Zhangcun coal mine in Lu’an coal mining area in Shanxi Province suffered from severe
mining-induced stresses with the heading face driven oppositely to an adjacent working face. In this paper, the characteristics
of deformation and failure of the entry were investigated in terms of the tempo-spatial relations between heading and working
faces through field study and numerical modeling. The three-dimensional (3D) finite difference models were built to
investigate stresses, displacements and damages in the surrounding rocks of the entry and the working face. The field study
includes selection of reinforcing methods and materials, design parameters, and determination of cable prestress. The
monitoring data of entry deformation and stress along the cables during every stage were presented. The state of the
reinforced entry was evaluated based on the monitoring data. The results demonstrate that before the heading face of the entry
crosses the adjacent working face, the influence of advanced abutment pressure caused by adjacent working face upon the
entry is not significant. After they cross each other, however, the lateral abutment pressure will have an evident impact on the
entry. The displacement rate of the entry will be greatly increased and reaches a certain value within a certain distance
between the heading face and the working face. Then, it will increase again with the presence of secondary mining-induced
pressure on the entry when the present working face advances. The fully-grouted cable with short length, high strength and
high prestress is an effective way to reinforce the entry suffering from severe mining-induced stresses, which greatly reduces
the displacement and failure possibility of the entry. Finally, the principles and recommendations for reinforcing design of
entries suffering from severe mining-induced stresses were proposed according to field study, numerical modeling and
experiences from other coal mines. Problems encountered in field study and suggestions for reinforcement were also
discussed.
Key words: mining engineering; coal mine entry; severe mining-induced stress; stress distribution; field study; reinforcing
principle