CUSTOMIZED METHOD FOR DETERMINING COAL MINING FACE FLOOR WATER INRUSH RISK LEVEL

摘要

A customized method for determining a coal mining face floor water inrush risk level belongs to the field of coal mining safety. The method comprehensively takes account of the following factors: a water pressure at a coal mining face floor, a water-impermeable layer thickness, a coal seam floor mine pressure damage phenomenon, a lithological association of water-impermeable section rock layers, the development of original intrusion of confined groundwater at the floor, and the like. The method establishes an implicit functional dependence relationship between the affecting factors and a water inrush risk level, analyzes a point of abrupt change of the implicit function, and establishes a comprehensive evaluation index system for floor water inrush risk level evaluation. The method of the invention comprehensively takes account of various factors affecting a coal mining floor water inrush risk, and establishes a functional dependence relationship between the affecting factors and a water inrush coefficient, solving the problem in which a conventional method takes account of only a water pressure and a water-impermeable layer thickness, or cannot establish a functional dependence relationship between affecting factors and a water inrush coefficient. The method of the invention is a novel water inrush coefficient calculation method.