Study on hydrochemical characteristics and discrimination method of water gushing source in Liujiacun tunnel
As an important part of the water diversion project in central Yunnan,Liujiacun tunnel needs to pass through the high-water level water-rich stratum during the excavation process,so it is prone to water inrush accidents.The tunnel site is located in the red layer,and the groundwater is an important water source for production and life of local residents.It is of great significance for the development and utiliza-tion of local groundwater resources to reveal the hydrochemical characteristics of groundwater in the study area and establish a water gushing discrimination model.This article collected 11 sets of groundwater hydrochemical samples from three different aquifers and 2 sets of inflow water samples from two construc-tion adits,and revealed the hydrochemical characteristics of regional groundwater by using the methods such as piper trilinear nomograph,ion proportion coefficient and correlation analysis of hydrochemical inde-xes.Taking principal component analysis and Fisher discriminant analysis as the basic model,a fast dis-criminative model of water inflow source coupled by R-type clustering,principal component analysis and Fisher discriminant analysis was constructed.The model is suitable for areas with less water sample data;in addition,the actual sample data of Liujiacun tunnel were used to verify the model,and compared with the method combining principal component analysis and Fisher discrimination.The results show that the ionic components in groundwater mainly come from the dissolution of calcite,dolomite,gypsum,glauberite and other minerals in the formation.Compared with the coupling method of principal component analysis and Fisher discriminant analysis,the accuracy of using the fast discrimination model in this paper is 9.1％hig-her than that of the coupling method of principal component analysis and Fisher discriminant analysis.
groundwater resourcediscrimination of inrush water sourcehydrochemical characteristicLiujiacun tunnel
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