Risk Assessment Of Water Inrush From Longwanggou Coal Mine Floor

At home and abroad,there are few related researches on floor water prevention under the special mining condition of fully-mechanized top coal mining on confined water bodies.In order to ensure the safe mining and sustainable development of similar mines,the paper is based on the geological data of Longwanggou coal mine To study the risk of floor water inrush from fully mechanized top coal caving mining on the confined water body of 6#coal seam in this mine.According to theoretical analysis of soil mechanics and mine pressure,it is found that the thickness of the coal seam and the depth of the floor are linear.The thicker the seam,the greater the depth of the floor.The Flac3D numerical simulation software is used to simulate the mining process of the 61601 working face,and the evolution from the floor rock Characteristics,floor stress evolution characteristics,and plastic deformation characteristics to analyze the damage process,depth of failure,and damage law of the water-repellent layer of the coal seam floor under the influence of mining in extra-thick coal seams.According to the geological,hydrogeological,and engineering geological characteristics of the Longwanggou mine,The main control index system of floor water inrush was established,with a total of 11 main control factors,including water richness,permeability and water pressure,complexity of geological structures,structural intersections,thickness of aquifers,equivalent aquifer thickness,and brittle plastic rocks Thickness ratio,coal seam thickness,coal seam burial depth and floor damage depth,and thematic maps of the main control factors are established using interpolation methods with the help of geographic information system(GIS)software.Based on the gray system theory and fuzzy mathematics in uncertainty mathematics,A New Method for Evaluation of Floor Water Inrush Risk in Longwanggou Mine—Interval Grey Optimal Clustering Model Based on the main control index system of floor water inrush and the strong spatial information processing capability of GIS as the technical support,the zoning map of Longwanggou 6#coal seam floor water inrush risk evaluation was obtained,and the safety,security,danger and danger were obtained.Position and area information of each level;using the"five-graph double coefficient method"with"pressure coefficient"and"water inrush coefficient"as the main evaluation indicators,combining"three-level discrimination"and the actual situation of the mining area,establishing four evaluation standard pairs The risk of water inrush from the floor of the coal mine was evaluated,and finally the Longwangou 6#coal seam under pressure mining evaluation division map was obtained.From the map,the type of floor water inrush in each area and the scope and area information of the evaluation criteria of the entire mine were obtained;do not use The GM(1,1)model and the GM(1,1)model based on the oscillating sequence are used to establish a mine water gushing prediction model.The results show that the GM(1,1)model based on the oscillating series has higher accuracy and is more suitable for Longwanggou coal mine Gushing water forecast.Using the"Large Diameter Method"to predict the amount of ash water from the floor during the mining of 61601working face,get water gushing data:Q(28)550.71m~3/d=22.95m~3/h.Put forward the general idea of floor water prevention and control based on“zonal evaluation,clear hidden dangers,fine exploration,first exploration and then digging,grouting transformation,first treatment and then mining,full monitoring,and comprehensive fortification”,focusing on the advancement of regional management of Austrian ash.Requirements for safe mining of the mine,and proposed a grouting reinforcement scheme for floor auspicious gray water exploration and management.This paper includes 36 diagrams,21 tables,and 90 references.