Study On Multiple Chemical Evolution Characteristics And Identification Of Main Water Inrush Sources Of Groundwater Under Mining Conditions

Mine water inrush can cause great loss of life and property to the coal mine,which has always been an important hidden danger to the safety of coal mine production.After water inrush,water source is the primary consideration Therefore,the rapid identification of mine water inrush source and the accurate identification of water inrush mode are of great significance for mine water prevention work and safety production.In this paper,Peigou Coal Mine is taken as the research object,and the floor failure rule is analyzed through the field borehole imaging technology,and the influence of mining on groundwater seepage field with or without faults is simulated and analyzed by using MODFLOW numerical simulation software.Based on the collection and arrangement of hydrochemical data measured in the study area over the years and during the study period,the change of conventional ion content and the characteristics of hydrogen and oxygen isotopes in the main water inrush aquifers are analysed.Fisher discriminant model and BP neural network discriminant model are established.Through the method of system cluster analysis,the hydraulic connection between aquifers is verified,and the main water inrush modes in the study area are proposed.The research contents and results are as follows:?1?In this paper,the influence of the disturbance on the floor under different driving conditions is analyzed by using the borehole imaging technology,and a large number of comparative image data of the deformation characteristics of the surrounding rock at different depths are obtained and the disturbance failure depth of driving floor under this condition is obtained.Through the MODFLOW numerical simulation software,the seepage field model of groundwater under the condition of fault and no fault is established,and the seepage field in the study area is simulated.It is found that the influence of fault on groundwater is greater than that of mining fracture,and the hydraulic connection among aquifers is analyzed.?2?Through the Piper trilinear analysis of conventional ions,the water quality types of the main aquifers in the study area are obtained.Through the content change analysis of conventional ions and the analysis of ion combination ratio,the change rule of characteristic ions in the main aquifers is obtained.Through the analysis of hydrogen and oxygen isotopes,the change rule and source of hydrogen and oxygen isotopes in the aquifers in the study area are found.?3?Through SPSS software,the Fisher discriminant model and BP neural network discriminant model for water inrush source identification in the study area are established,and the accuracy of the two models is compared.The identification of water inrush sources in the study area is realized.By using the method of systematic cluster analysis,it is verified that there is a good hydraulic connection between aquifers L_7-8and L_5-6 and aquifers L_1-4 and O₂.?4?The conventional water inrush model of the floor aquifer is analyzed.Combined with the analysis results of the study area,the main possible water inrush models in the study area are discussed and analyzed.There are 66 figures,23 tables and 112 references in this paper.