Risk assessment of roof water inrush in Nalinhe No.2 Mine based on"Three Maps Method"
The Jurassic Coalfield in northwest China are generally threatened by roof water hazard,which affects the safety of mining pro-duction.This article took the 3-1 upper 103 working face of Nalinhe No.2 Mine as an example,aiming to provide an effective method for e-valuating roof water hazard.By establishing a hydrogeological profile and applying the"Three Maps Method"theory,the main controlling factors affecting the water abundance of the sandstone aquifer in the coal seam roof were analyzed,including the thickness of the sandstone aquifer,permeability coefficient,thickness ratio of brittle plastic rock,and core recovery rate.The analytical hierarchy process(AHP)was used to scientifically quantify the weights of the main control factors,and the water abundance of the aquifer was evaluated based on the water abundance index,and the safety of roof cracking and the risk of water inrush were obtained.The reliability of the proposed method was preliminarily verified by comparing it with the low resistance abnormal areas obtained by the audio electric perspective technology.The research results provide a basis for the safe mining of the 3-1 upper 103 working face in the Nalinhe No.2 Mine,and have important refer-ence value for guiding the prevention and control of roof water hazard in similar areas.
Jurassic Coalfieldroof water hazard"Three Maps Method"analytical hierarchy process(AHP)water abundance index
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