Research on Support Technology of Long Anchor In Fully- Mechanized Caving Thick Coal Broken Roadway

The 5204 transport roadway roof displacement encountered during the tunneling and mining is more than 240mm, which severely damaged the shape of the roadway. The anchor cable of the top is pulled off and supporting failure takes place. According to the analysis of the surrounding rock pressure behavior law, the concept of supporting new technology based on the concept of "coordinating role of long bolt - surrounding rock" is brought up. This technology can achieve a reasonable match of the supporting object with the displacement and support strength of the surrounding rock. Based on this concept, FLAC3D numerical simulation analysis, combined with the engineering analogy method, produces the long bolting parameters on the 5402 transport roadway. The industrial test results show that in the mining face, the force state of the long bolt is good. When larger displacement in the roof appears, the long bolt is not pulled off and the support failure does not occurs.It means the long bolt has adapted the large deformation of the roadway roof. The research results can provide a reference for similar mechanized caving roadway supporting.