Abstract:Water disaster has become one of the most important disasters that threaten the safety of coal mine production. It will not only cause great threat to the safety of underground workers, but also cause important losses to the economy of coal mine. The hydrogeological conditions of coal mines are greatly affected by strata, structures, magmatic rocks and other factors, which makes the types of water disasters various. Especially, the ability of fine exploration and prediction of concealed water conducting structures is insufficient, which makes it an important water diversion channel for mine water disasters. Water inrush occurred in No.1313 working face of Xiaoyun coal mine. Although the area is within the scope of 3D seismic, due to the limitation of seismic technology, the resolution of rock and coal seam under coal seam 3 is very low. The 3D seismic fine report and underground transient electromagnetic results have not explained the development of collapse column in this area. Based on the study of geological stratum, structure, magmatic rock and hydrogeological survey in the mine, as well as the analysis of water quality after water inrush, hydrological observation of adjacent Ordovician limestone observation hole and water temperature, it is considered that the water inrush source is Ordovician limestone aquifer. Through the leakage depth and grouting situation of grouting hole in the later stage, it can be determined that there is a subsided column with half diameter of 9.00m, The height of development is about 116m. Based on this, it is comprehensively judged that the channel of water inrush in the mine is a subsided column structure hidden under the floor of No.3 coal seam.
