Research on two-dimensional imaging method of tunnel water hazard hidden danger based on magnetic resonance rotation detection

Abstract

In light of the non-layered and non-uniform distribution of water hazards in tunnel spaces, existing imaging methods are challenged in accurately reflecting the spatial distribution of these hazards. Through an analysis of the magnetic resonance imaging resolution in tunnel rotation detection, we have developed different models for water-bearing channels as well as complex fault and cave models for water hazards. Subsequently, complex envelope inversion formulas and a two-dimensional complex envelope inversion expression for tunnel spaces have been derived based on the envelope data from tunnel magnetic resonance detection. The optimal solution is obtained through Tikhonov regularization, the Gaussian Newtonian iterative method, and smoothing constraints. This approach allows for the determination of water content and relaxation time parameters. Ultimately, the complex envelope inversion method facilitates the realization of high-precision, two-dimensional imaging of tunnel water hazards. This pioneering method introduces a novel approach to address the challenges associated with quantitatively detecting and providing early warnings for tunnel water hazards.