The conventional advance detection of tunnels using
magnetic resonance technology can only obtain onedimensional
depth imaging, making it difficult to accurately reflect the spatial
distribution characteristics of nonlaminar waterbearing
structures and causing safety hazards in tunnel construction. Therefore, using
magnetic resonance technology, a twodimensional
imaging method based on complex envelope inversion for tunnel rotation
detection of water hazards is proposed in this study. First, the complex
envelope inversion formula and twodimensional complex
envelope inversion expressions are derived for tunnel space based on the
detected envelope data of the tunnel using magnetic resonance technology. Then,
the water content and relaxation time are obtained by calculating the optimal
solution by Gikhonov regularization, Gaussian Newton iteration method, and
smoothing constraints. Finally, a case study is conducted on the Maizhishan
tunnel of the BaojiLanzhou highspeed railway and the process of magnetic resonance rotation
detection is simulated. The obtained imaging results of waterbearing structures in the tunnel roof, floor, left and right
sidewalls are numerically calculated. Results of the analysis are the
following: (1) The twodimensional imaging results of
accurate water content and relaxation time can be obtained in advance detection
using magnetic resonance technology. (2) The twodimensional
imaging detection results using magnetic resonance are in good agreement with
the actual engineering conditions, which can precisely locate the positions of
water hazards and predict the spatial distribution characteristics of
nonlaminar waterbearing structures, and are reasonable
and operational.
DIAO Shu
,
LIANG Wenjing
,
XU Aoshu
. TwoDimensional Imaging Method for
Tunnel Using Magnetic Resonance Rotary Detection[J]. Tunnel Construction, 2023
, 43(7)
: 1139
-1145
.
DOI: 10.3973/j.issn.2096-4498.2023.07.006
