Prediction method for the water enrichment of weathered bedrock based on Fisher model in Northern Shaaxi Jurassic coalfield

Jurassic weathered bedrock aquifer is an important gushing water disaster source in Northern Shaaxi Jurassic coalfield. Scientific prediction on its enrichment is an important issue to be resolved in mine water prevention and con- trol. This paper aims at the problem of water enrichment prediction in weathered bedrock. Take Hongliulin Coal Mine in Shenfu mining area as an example,the paper investigates the weathered bedrock development characteristics and its influence factors of water enrichment. Then,the paper selects four factors of weathered bedrock stratum age,thickness, weathering degree,and lithological association as the evaluation indexes,and establishes the Fisher discriminant analy- sis model on the type of water enrichment of weathered bedrock aquifer,using the borehole measured inflow and index data. The type of water enrichment of weathered bedrock in the drill hole which has no pumping test data can be pre- dicted using the Fisher model. The studies have shown that the prediction of weathered bedrock water enrichment based on Fisher discriminant analysis model is feasible,and it provides a new scientific prediction method for the water enrichment of weathered bedrock.