Innovative technology for estimating water content of water-holding construction in coal mine tunnels

The estimation of water content in water-bearing structure of coal mine tunnel directly affects the progress and quality of coal mine tunnel construction. Therefore, in order to accurately estimate the water content of water-bearing water in coal mine tunnels, this experiment innovatively applies nuclear magnetic resonance detection technology to advanced geological prediction. The research first explains the principle of water detection of nuclear magnetic resonance technology, and then optimizes and improves it to be more suitable for water detection in coal mine tunnels. In addition, in order to realize the numerical simulation of water exploration in coal mine tunnels, particle swarm optimization and wavelet transform are also applied to the inversion of nuclear magnetic resonance data. The emission energy and the sensitivity of the received signal of the optimized nuclear magnetic resonance water detection technology are improved, and the noise of the overall model is also reduced. Finally, the laboratory test of nuclear magnetic resonance water detection in coal mine tunnel was carried out. The experimental results show that the water volume value obtained from the NMR response is basically consistent with the water volume value in the actual water-holding construction; Compared with the set water content (0, 0.167, 0.333, 0.5, 0.667), the water content in the water-holding construction of the coal mine tunnel measured by nuclear magnetic resonance detection under five working conditions is basically consistent, which verifies the reliability of the technology.