The Methods Based On The Optimum Combination Of Karst Backplane Collapse Column Water Inrush Risk Evaluation Research

As coal resources increasingly tense,mining depth of coal seam and the intensity increasing,in the process of coal mining water inrush disasters caused great economic losses to the production,the karst collapse column water inrush is harm is great,is one of the common coal mine disasters.Karst collapse column in the process of extraction of water inrush accidents often happen,so for the water inrush mechanism of karst collapse column and damage rule are studied,and water inrush for safety evaluation of karst collapse column,the implementation of mine safety production,improve the recovery rate of coal is of great significance.First collect the study area of coal mine geology,hydrogeology,engineering geology data,using direct current prospecting,3 d seismic exploration,the exploration of coal seam roof and floor of controlled source audio-frequency magnetotelluric method of water filling performance,analyzed the study area,the distribution of water-resisting layer and aquifer,determine the distribution and development of karst collapse column.Then from the forming conditions of karst collapse column and water resistance performance analysis,this paper theoretically for floor water inrush mechanism of karst collapse column is analyzed,explore the general influence factors of floor water inrush karst collapse column,the formation and the correlation analysis of influential factors and disasters.The failure mechanism of the surrounding rock in stope is studied,and the destructive characteristics of the surrounding rock of coal seam roof and karst collapse column are analyzed.USES FLAC3D to simulate the GeTing process of karst collapse column in mining coal seam floor,roof and floor of coal seam in the process of excavation damage regularity of karst collapse column and the surrounding rock mass and its mechanism were analyzed,and the influence factors of floor water inrush karst collapse column is determined,and a variety of factors influencing the karst collapse column and floor water inrush correlation analysis,selection of mining height arc broken and the water pressure of aquifer numerical suulation analysis was carried out on the floor water inrush karst column.Finally YAAHP as platform,build based on hierarchy analysis of floor water inrush karst collapse column to determine model,main control factors and to determine the main controlling factors of quantitative analysis,to select the index of floor water inrush risk evaluation of karst collapse column.MATLAB2015b was constructed based on the hierarchical analysis-principal component analysis risk assessment model,and the combined weights of evaluation indexes were determined by using the dispersion square method.In this paper,the threshold value of the water-inrush hazard of the bottom plate karst collapse column is introduced.Then,according to the results of the evaluation model,the classification of risk level is carried out.Finally,the model is designed to be applied to the coal mine,which provides risk assessment and prediction for coal mining under similar geological conditions.