Study On Evolution Characteristics Of Separation Movement And Water Inrush Of Overburden Strata Induced By Mining

The economic losses caused by mine water inrush accidents are very huge,and they directly threaten the safety of coal mine workers.Therefore,it is urgent to predict and prevent mine water inrush accidents and ensure the safety and stable production of coal mines.The research on the topic of water inrush from the roof of the mine involves many disciplines,including engineering hydrogeology,rock mechanics,mining engineering,and seepage mechanics.As a type of roof water damage,which is not new,but is relatively unclear,overlying strata water damage is rarely studied at home and abroad.Therefore,carrying out the analysis and research on the mechanism of water inrush from delaminated water is of great practical significance and long-term strategic significance for the future to propose practical and effective water control measures and improve coal mine safety production conditions.The water inrush accident of the separated layer is a relatively special one in the problem of roof water inrush.The main difference is that the water source is stored in the overlying rock layer.In this paper,we selected the water inrush event encountered in the actual mining process of Hongliu Coal Mine 1121 as the research object,combined with the overburden and hydrogeological structure,studied and analyzed the characteristics of overburden movement and deformation and water inrush,and the following conclusions were obtained::(1)Collecting engineering geology and hydrogeological data of Hongliu Coal Mine by reading books,consulting documents and project reports,etc.Taking the water inrush accident during the mining of the 1121 working face as the starting point,the hydrogeological and engineering geological characteristics of Hongliu Coal Mine are analyzed Refer to the completed research progress of the mine and combine with qualitative conclusions and theoretical analysis results to comprehensively explore the geological factors of the formation of water inrush from the layered water..(2)Through the analysis of the formation and development of separation layer and the general process and formation conditions of separation water inrush,combined with the transfer rock beam theory and key layer theory,the mining overburden rock is zoning predicted and the separation layer is judged To obtain the special mechanism of water separation and water inrush in Hongliu Coal Mine 1121 working face:the source of water separation and water inrush in Hongliu Coal Mine is the upper layer coarse sandstone aquifer in the Lower Zhiluo Formation,and the separation layer is formed between it and the underlying mudstone layer.Following the fracture of the delamination space,the sealed delamination water burst into the mine instantly,causing water inrush.(3)Based on similar material simulation experiments,physical simulation was carried out for the specific mining conditions of the coal mine,and the characteristics of the movement and deformation of the overburden rock in the coal seam were summarized and studied during the specific mining.The water mode simulates the seepage of the delaminated water and the scouring effect on the lower rock.(4)Using UDEC5.0 numerical simulation software,a two-dimensional physical model and numerical model were established based on the hydrogeological conditions of the Hongliu Coal Mine Project and the actual data of coal seam mining,and a numerical simulation experiment was conducted on the mining process.The simulation calculation results were compared with the physical experiment results.To further analyze the variation characteristics of stress and displacement of overburden rock,especially the upper and lower strata,not only verify the rationality of the simulation method of similar materials and the parameters selected in the experiment,but also obtain the development of overburden separation under similar conditions of Hongliu Coal Mine.And the dynamic process of rock deformation and destruction below..