电磁波CT剖面异常快速平面投影方法与应用

Method and application of projecting abnormal apparent absorption coefficient of electromagnetic wave CT profile on plane map

为解决轨道交通大数据量钻孔电磁波CT剖面视吸收系数异常人工投影到平面图时效率低、易出错、校核难的问题,研究了一种利用计算机进行快速自动投影的方法。该方法首先建立剖面图中视吸收系数异常区域与钻孔的各种空间位置关系的编码规则,利用编码规则将视吸收系数异常进行编码,再沿着平面图中的测线绘制相应剖面上视吸收系数异常的平面投影线。工程实例应用表明:该方法可实现大数据量电磁波CT剖面视吸收系数异常的快速平面投影,相对于人工投影方式大大提高了工作效率,且能更好地控制投影成果质量。

In the Karst detection of urban rail transit, there are large numbers of electromagnetic wave CT profiles formed because of the dense boreholes arranged. In order to solve the problems of low efficiency, error-prone, and checking difficulty of projecting abnormal apparent absorption coefficient of electromagnetic wave CT on plane map by manual method, a computer-aided automatic projection method was studied. Firstly, the coding rules of the relationship between abnormal apparent absorption coefficient and various spatial positions of boreholes were established. The positions of abnormal apparent absorption coefficient polygon were coded using coding rules. Then the plane projection lines of abnormal apparent absorption coefficient of the profile were drawn according to the measure lines in the plane map. The fast planar projection of large numbers of abnormal apparent absorption coefficient of electromagnetic wave CT was realized. Compared with the manual projection method, this new method can greatly improve the projection efficiency and quality.