Numerical Simulation Based On Groundwater Modeling System On Kongzhuang Ore Limestone Aquifer

In recent years,Kongzhuang Mine has increased in the depth of mine mining.As a result,the increase in depth has led to a gradual increase in groundwater pressure.Four gray water in the limestone aquifer has flowed into the mine along the fractured and fractured structural belt and threatened mine production.Therefore,it is necessary to conduct groundwater numerical simulation on the limestone aquifer in Kongzhuang ore,so as to provide a reliable theoretical basis for mine mining,and greatly reduce the mine water disaster and the occurrence of safety accidents.Based on relevant research at home and abroad and the physical geography,hydrometeorology,socio-economic and hydrogeological conditions of the Kongzhuang Mine,the GMS software was used to establish the groundwater flow model in the study area,including the three-dimensional visualization model and numerical model of the hydrogeological layer.Firstly,the three-dimensional stratigraphic model of the study area was established using the TIN and SOLID modules in the GMS software.Secondly,the groundwater mathematical model of the limestone aquifer was established through the MODFLOW module.From January 2012 to January 2013 as the identification period of the model,from January 2013 to January 2014,the reliability of the model was determined as the validation period of the model.The main conclusions and results obtained are as follows:(1)The three-dimensional model of the formation includes the Kongzhuang ore aquifer model and the top boundary of the 8th coal bottom plate,and the depth of the uncovered hole is the three-dimensional model of the simulated area.Through the former,the spatial combination of the Kongzhuang ore aquifer is obtained.According to the latter,the top of the limestone aquifer is covered with a thicker layer of mudstone.Therefore,it is used as the water-resisting boundary at the top of the limestone aquifer to establish the ash.The rock aquifer mathematical model provided the basis;(2)Based on the mine data and based on the MODFLOW model to generalize the limestone aquifer,the Kongzhuang ore limestone aquifer is generalized into an anisotropic and isotropic three-dimensional unsteady flow problem.Simultaneous boundary conditions are generalized.And the treatment of the source and sink items,the establishment of a hydrological groundwater numerical model for the limestone aquifer in Kongzhuang ore;(3)By comparing the absolute error between the actual water level and the calculated water level,there are a total of 65 long observation holes with a total of 65 nodes,of which 73.9% have a node error of less than 0.5m,and 26.1% have a node error of more than 0.5m.At the same time,the flow field and actual conditions are calculated.The degree of fit between the calculated flow field and the actual flow field is better,and the calculated flow field basically reflects the flow and trend of groundwater in the limestone aquifer.Therefore,it can be seen that the hydrogeological model corresponding to the identified model of the Limestone aquifer of the Kongzhuang ore is basically consistent with the actual hydrogeological model.The boundary generalization is more reasonable,the source and sink items are processed more correctly,the parameter partition is more reasonable,and the parameters are basically correct.