Study And Application Of Roadway 3D Resistivity Imaging Technology

In coal mining,mine water damage is one of the main factors affecting coal mines' safe production.The water-rich areas near the coal seams are a serious threat to the safety of coal mine production.Probing the conditions of the water-rich areas near the underground coal seams can effectively guide the damage of coal mines.Prevention work.In the prevention and control of water down hole,the main methods used are transient electromagnetic method and direct current method.The direct current method in wells is mainly based on high density.This paper is based on the research of direct current and finite element theory of mines at home and abroad.Numerical simulation and imaging are used to analyze the characteristics of the anomalous body response of the floor slab in the mine coal mine,and provide a theoretical reference for the interpretation of actual measurement data.In this paper,a high-density measurement method using direct current method is adopted.A two-pole measurement device is selected.Using a programming software,numerical modeling of various geological models established is performed.Then inversion imaging is performed using inversion software,and the resulting image is grounded.Electrical model comparison analysis and analysis provide technical and theoretical support for coal mine water control.Finally,the application examples of DC resistivity method in three-dimensional imaging in mines and the problems existing in the application of DC resistivity method in mines are mainly introduced.How to use the limited space to develop numerical simulation and exploration of three-dimensional DC resistivity method in underground environment is the main content of this thesis.Firstly,the related theories of DC resistivity method,the characteristics of mine direct current method,and the basic ideas of positive and inversion theory and finite element method are introduced,including boundary value and variational problems of three-dimensional point supply field,meshing,and linearity.Difference and unit analysis,total potential calculations,etc.The second is to use the two underground tunnels and contact lanes to first establish the geoelectric model,and then add the low-resistance anomaly on the basis of the model.Use the Visual Fortran programming software to program each model to establish a full-space finite element forward numerical value.Simulation,and then use RES3DINV inversion software to use water layer inversion for inversion imaging,output inversion data,drawing with Surfer software,easy to compare each model.