关键词: 电磁波CT剖面, 视吸收系数异常, 平面图投影, 计算机投影, 编码规则

Abstract: 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.

Key words: electromagnetic wave CT profile, abnormal apparent absorption coefficient, projection for plane map, computer projection, coding rule