New Type of High-Strength Support in Deep Soft Rock Roadway

In order to control the deformation of large section surrounding rock in 700m level of the main drainage pumping station in the experimental mine, according to the reason for deformation and failure of the main drainage pumping station and material mechanics, fully-closed U-shaped support which used double welding I-steel bottom arch as the main structure was designed and the assembly and principles of support were described in detail, based on theoretical calculation and comparative analysis on the structure and mechanical properties of rectangular I-beam support, U-steel support, single I-beam arch support and double I-beam arch support. Based on the comparative analysis by numerical simulation, the rationality of the high strength support and the detailed support parameters were determined. It gets good effect in field application and ensures the long-term stability of the main drainage pumping station. The results show that: the double-layer I-beam 12 # can increase bending strength by about 7.5 times. Double trough splint device used in shoulder of the support has the advantages of high strength, greater rigidity, good pliability and stable working resistance.