Study on the Failure Law of Mining-induced Surrounding Rock in Fault Structure Dense Zone

The fault-intensive zone in the south-central part of the 3_upper128 working face （outer section） of Luxi Coal Mine is prone to fault activation during mining, exacerbating the damage to surrounding rocks in the mined-out area and posing a threat to coal production safety. This study employs a combination of theoretical analysis and FLAC^3D numerical simulation to construct a model of surrounding rock damage during mining, explore the influence of the fault-intensive zone on the damage to surrounding rocks during mining, and compare the results with theoretical calculations without the fault-intensive zone. The research indicates that the rock mass in the fault-intensive zone has poor integrity and low mechanical strength, with significant fault activation and severe damage to surrounding rocks. The simulation reveals a water-conducting fracture zone with a development height of 50 m and a water-conducting damage zone depth of 20m in the floor, both of which are higher than the values calculated by empirical formulas without the fault-intensive zone, which are 37.17 m and 11.31 m, respectively. This conclusion provides a scientific reference for safe production in mines located in complex fault-intensive areas.