Aiming at the problem that the loose circle of surrounding rock exceeds the range of bolt support after the open-off cut of 0294 working face in Tangshan Mine, this paper reveals the dynamic expansion characteristics of the surrounding rock failure zone during the excavation and widening. This study utilizes the butterfly plastic zone theory combined with numerical simulation analysis. Based on the stress state of rock mass in the loose circle, the criterion of anchorage instability is established, and the mathematical relationship between the bearing capacity of rock mass and the degree of fragmentation and the stress state is clarified. The results show that the size of rock mass has an important influence on the bearing capacity of anchor bolt and anchor cable. According to the stress distribution law of surrounding rock during the excavation and expansion of 0294 working face, roof of the roadway has high horizontal stress, and the rock mass in the loose circle still has high bearing capacity. Based on this, a combined support scheme of “2.4 m bolt+6.5 m grouting anchor cable+10.5 m long anchor cable” is proposed. The research conclusions provide theoretical support for bolt support in deep large loose circle roadway.
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