Abstract：In view of the problems of low anchorage force and fast for decay rate in the bolting of loose coalrock mass roadway, the finite element numerical simulation software ABAQUS was used to simulate and analyze wall rock mechanical characteristics of the bolt-holes reaming in the sandy mudstone and soft coal seam. The results showed that under the same confining pressure, the diameter of the reaming section was negatively correlated with the strength of the surrounding rock. Under the same lithologic condition, the maximum diameter of the reaming section was negatively correlated with the confining pressure, which verified the characteristics of coal seam and sandy mudstone can meet better reaming effect. The reaming and anchoring tests were carried out in soft coal seam and sandy mudstone with a single-wing reaming device that developed in situ. The anchorage force of bolt-hole reaming in soft coal seam and sandy mudstone was significantly larger than that of bolthole non-reaming.

Keyword：anchorage hole;ABAQUS FEM numerical simulation;bore hole diameter;soft-coal rock mass;wall rock mechanical characteristics;