Detecting Application Research Of Magnetic Resonance Method In Wuhai Goaf Water

Mine water disasters in our country has been the key factor restricting thedevelopment of coal production. Due to the unreasonable small coal minedevelopment, mining in some mining area, the destruction of the waterproof coalpillar, lead to the formation of the mined-out area, and goaf water, commonly knownas " goaf water ". Because the goaf water of great harm from coal field explorationand development, therefore, in the prevention and control of goaf water disasters, weput the goaf water prevention and control as a top priority. There are many ways to thecause of water bursting accidents, probe the method of water with geological,geophysical prospecting, drilling, such as remote sensing and geochemicalexploration methods. Using magnetic resonance sounding (MRS) method can directlydetect groundwater, created the beginning of geophysical methods directly to findwater, the method is the new method of direct water survey in the world, this methodfor special geological conditions of groundwater data collection has importantpractical magnetic resonance sounding (MRS) method as currently the world’s mosteffective direct detection method of groundwater, Magnetic resonance (NMR) methodcan direct a sudden surge of water content, porosity, water aquifer detection ofhydrogeological parameters such as position.But when using one magnetic resonance sounding (MRS) method instrumentsearch for groundwater, the efficiency is not good, we need spend a lot of time in theactual detection of each measuring point in the process of measuring work. In theprocess of using magnetic resonance instrument exploration, practical exploration area is relatively large, the area is generally in more than30km2. In order to improvethe detection efficiency, this paper puts forward the two sets of instruments to worktogether, but any two magnetic resonance sounding instrument laying on the surfaceof the coil in a certain range between mutual interference, therefore how to determinethe two coil space distance in a regional scale is particularly important to us. In orderto improve the efficiency of field work and ensure the data collected is accurate andeffective.Aiming at mutual interference between any two coil at work, this article carried onthe thorough research. Firstly, I establish the basic model of magnetic resonancesounding instrument detecting groundwater, analysis the influence factors of:magnetic resonance sounding signal: through the analysis of moisture content changes,including the depth of the water change and the influence of changing the thickness ofthe aquifer of the magnetic resonance sounding signal, forward to calculate themagnetic resonance sounding instrument to detect the value of the minimumsensitivity of groundwater, the value of46.64nV. Secondly, using the basic theory ofelectromagnetic field calculation, combine with the wave equation and boundaryconditions, simulation of induction electromagnetic field in the software, magneticresonance sounding of the antenna model, simulation to calculate the two magneticresonance sounding instrument and the safe distance between the two coils at work,when the distance between the two antennas work for1900m, the interferencebetween them can be neglected. Finally, we collected and inversion the data ofgroundwater which is the resonance instrument in Wuhai area detection measurement,and validate to solve problems in practical exploration work efficiency effectivenessand accuracy of this method.