Study on Deformation and Failure Mechanism and Control of Surrounding Rock in Super Large Section Roadway

Shihao Zhang

doi:10.54691/7p7wjv82

Authors

Shihao Zhang

DOI:

https://doi.org/10.54691/7p7wjv82

Keywords:

Super large cross section ; size effect ; surrounding rock reinforcement.

Abstract

Aiming at the outstanding problems of difficult deformation control and poor stability of surrounding rock in super large section roadway of coal mine, the mechanical mechanism of deformation and failure of surrounding rock in super large section roadway is systematically analyzed, and the typical failure modes such as roof bending settlement, high side wall buckling instability and strong floor heave are expounded. According to its failure characteristics, a comprehensive control technology system with the core of ' step-by-step excavation pressure relief, active coupling support and overall reinforcement of surrounding rock ' was constructed, and a collaborative control method of ' advanced pre-support + step-by-step excavation + high pre-stressed anchor net cable spray primary support + reinforced concrete secondary lining ' was proposed. The industrial test was carried out in the return air roadway of 8000 working face in Wuyang Coal Mine. The results show that the method can significantly control the deformation of surrounding rock within the allowable range, ensure the long-term effectiveness of support structure and ensure the safety and stability of roadway.

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