Risk Assessment and Water Inrush Mechanism Study of Through-Type Fault Zone Based on Grey Correlation Degree

In order to effectively prevent and control the problem of water inrush from through-type fault floor, based on analysis case data structure in Fengfeng mining area, types karst floor are divided into 3 categories, 6 subcategories, 17 fine categories. Four modes summarized: composite inrush, roof crack expansion vertical inrush. Based grey correlation theory combined with Analytic Hierarchy Process (AHP), this paper evaluates risk F55-1 zone a micro individual perspective, taking Xin’an Mine as engineering background. water–rock coupling theory, FLAC3D numerical simulation software is applied study disaster mechanism mode fault. Through analyzing changes primary fracture stress displacement intact strata aquifuge, pressure confined zones, collaborative damage bottom plate rock layer, connection original fracture, seepage progressive intrusion during advancing process working face analyzed. The research results indicate that evaluation result Level I, belonging high consistent actual situation model, verifying rationality model. model summarized follows: failure caused by rupture instability aquifuge; develops—water connected between zone; lagging flood occurs. Under action mine pressure, height significantly increased. have important reference basis for future coal planning. This provides practical experience prevention structured plates under similar conditions.