Abstract:

According to the engineering background of surrounding rock deformation instability in Mugua Coal Mine ore 103 segment transport Roadway, based on Ground Pressure and Strata Control theory, Mathcad software used to calculate the vertical pressure on this roadway, The force boundary of UDEC numerical modeling is established based on the results, establish UDEC numerical calculation model and optimize support parameters for this roadway, and put forward asymmetric support programs. The results of research show that: Mugua Coal Mine ore 103 segment transport roadway under high stress of legacy coal pillar of close-seam, and have very obviously asymmetric vertical pressure acting on both sides of the roadway(where the right side is 18MPa, the left is 11Mpa). Because of the stress environment and results of numerical calculation, put forward asymmetric support programs, coupled with the force status of the roadway, can significantly reduce the amount of deformation of the surrounding rock than the original symmetry support programs.

Key words: Close-seam, High Stress Roadway, Asymmetry, Numerical Modeling, Support optimization