Failure Mechanism Analysis and Support Technology for Roadway Tunnel in Fault Fracture Zone: A Case Study

This paper introduces a case study on the failure mechanism and support design of roadway tunnel in fault fracture zone 106 mining area Yuandian no.2 coal mine. Based on-site geological conditions (in-situ stress test, borehole television imaging, lithological analysis), was studied. The test results showed that high tectonic stress, fractured rock, poor lithology are primary reasons for instability. According to principles grouting reinforcement, pre-reinforced support, rational range, new type combined technology proposed, including advanced grouting, bolts, anchor cables. A 100 m section selected field testing using scheme, detailed deformation monitoring performed. Monitoring under significantly reduced. During excavation process, no roof collapse phenomenon occurred, safety ensured. successful provides an important reference similar projects zone.