隧道磁共振旋转探测水害隐患定位成像方法研究

突水灾害严重影响隧道建设，磁共振探测技术作为一种直接和定量探测方法，对隧道超前探测预警具有重要意义。但隧道磁共振探测应用时会受复杂空间条件的限制，为此本项目提出采用小尺寸线圈旋转扇形扫描的探测方式，解决隧道空间狭小的探测瓶颈，以复包络反演的含水量和弛豫时间三维高精度成像方法为研究核心，通过构建隧道磁共振三维正演模型，引入天线法向偏角和法向倾角旋转矩阵，推导旋转探测磁共振响应信号表达式，计算出不同旋转角度的三维灵敏度核函数，分析影响旋转探测成像分辨率及空间分布均匀度的因素，建立隧道三维反演目标函数，从而提高反演分辨率和目标体边界清晰度，并研究隧道含水通道、溶洞及断层等非层状分布水害隐患体的响应特征及目标识别机理，最终实现隧道水害隐患体的准确定位及高精度成像。本项目的实施将为磁共振探测在隧道施工安全提供有力保障，为我国地下工程超前探测提供新的科学研究思路。

The water inrush disaster seriously affects tunnel construction. As a direct and quantitative detection method, magnetic resonance detection technology is of great significance to the advance detection and warning of tunnels. However, the application of tunnel magnetic resonance detection is limited by complex space conditions. For this reason, this project proposes a detection method that uses a small-sized coil rotating sector scan to solve the detection bottleneck in the narrow working space, and invert the water content and relaxation by complex envelope. The Henan-time three-dimensional high-precision imaging method is the core of the research. By constructing the tunnel magnetic resonance three-dimensional forward model, introducing the antenna normal deflection angle and the normal tilt angle rotation matrix, deriving the rotation detection magnetic resonance response signal expression, and calculating the different rotation angles The three-dimensional sensitivity kernel function analyzes the factors that affect the imaging resolution and spatial distribution uniformity of the rotating detection, establishes the objective function of the tunnel three-dimensional inversion, thereby improving the inversion resolution and the definition of the target body boundary, and studies the tunnel water-bearing channels, karst caves and faults The response characteristics and target recognition mechanism of non-layered distribution of hidden water hazards can finally realize the accurate positioning and high-precision imaging of the hidden water hazards in tunnels. The implementation of this project will provide a strong guarantee for the safety of magnetic resonance detection in tunnel construction, and provide new scientific research ideas for the advance detection of underground engineering in my country.