HEIGHT OF FRACTURED WATER-CONDUCTING ZONE IN UNDERMINED COMPLETE-STRUCTURAL ROCK STRATA

For significantly different of height of fractured water-conducting zone in Yu-shen-fu and the traditional results, Yuyang mine is taked as study area. The height of fractured water-conducting zone was analyzed based on analysis of hydrogeological conditions, situ testing, theoretical analysis and numerical simulation. The results show that the percentage content of sandstone(about 85%) in the overlying strata of the Jurassic coal bed roof than Permo-Carboniferous. The thickness of the overlying strata of the Jurassic coal bed roof is larger and the vertical fracture is not developed. The main reason for the height anomaly of the water flowing fractured zone is that the integrity of the roof covering structure is better. The height of water flowing fractured zone was tested and calculated by using the field measurement and discrete element simulation methods. The results showed that the height of water flowing fractured zone were 60m and 95m for the structural plane development and none development of coal seam overlying strata, respectively, which is proved that the overlying rock structure is the main factor leading to the height of water conducting fractured zone.