Numerical Simulation and application on the thickness of loose circle in deep soft coal-rock roadway

摘要

In order to reasonabiy determine the thickness of loose circle and its distribution in deep soft coal-rock roadway using numerical Simulation method, a reasonable FLAC3D numerical caiculation model is established based on the practical arrangement of preparation mine roadway in Huainan mining area, Anhui Province. The thickness of loose circle and its distribution in soft coal-rock roadway are determined by the range of coal-rock strength from the original strength to the residual strength and the impact of layout parameters such as the buried depth, lithology, and section size on it is analyzed according to the numerical caiculation model. The results indicated that layout parameters of the roadway have obvious influence on the thickness and distribution of surrounding rock loose circle. The different positions in deep soft coal-rock roadway with large section have big thickness of loose circle, which is more obvious in the centre of the roadway, so that the support of key parts should be more strengthened.