Numerical simulation research on influence to fault based on thick coal seam mining

In order to find out the influence to fault based on fully-mechanized sublevel caving of thick coal seam, the software UDEC was used to establish the numerical model. The measuring points were arrangeed on the coal seam roof every 100m to monitor the relative displacement of upper wall and footwall under the condition of different working face mining. The result shows that all faults were influenced by mining activities, the top and bottom of formative fault space are small and the middle was large. The space of fault close to the working face was large. By the influence of two working face repeating mining, the space of fault close to the working face was compacted, and the space of fault which is far from working face have the trend of development. The fault space provides the space to storage water and become to hidden danger of water disaster.