Research and application on support technology of coal seam roadway with high stress

摘要

Based on the measured in-situ stress, the stress, displacement and plastic zone distribution in surrounding rock of the eastern 2# ventilation roadway of a mine in Shanxi are analyzed by using the generalized plane strain model, Mohr-Coulomb strength criterion and FLAC~(3D) software. And it is considered that the stress concentration of surrounding rock is significantly affected by the circumferential stress in the range of 0~3m and the radius of plastic zone is 5m. Both of them have strong uniformity in distribution and it is approximately located in the direction of 135°-315°, showing the asymmetric characteristics. Combining with the influence characteristics of in-situ stress on the coal seam roadway, an asymmetric support scheme for roadway section is proposed. The practice shows that the support is effective, which provides theoretical guidance for the design and optimization of support parameters of roadway with similar engineering conditions.