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接缝及其变化特征反映了盾构隧道管片的变形破坏过程。本文根据复合材料加固盾构隧道管片的试验图像,使用区域特征参数和边界特征参数来表征接缝的形态特征参数,区域特征参数包括接缝区域的像素总数、长轴、短轴、等效直径、与水平向轴夹角,边界特征参数包括几何参数和Fourier变换参数,研究了这些参数加固前后的变化特征。结果表明,加固前后接缝偏心率、长轴、短轴变化都比较平稳,难以用于评价加固效果;接缝面积、接缝等效直径、与X轴交角、圆形度、形状指数,加固前变化较快,加固后比较平稳,可以较好地用于评价加固效果;接缝棱角指数和纹理系数加固前变化很快、加固后非常平稳,这两个参数可以很好用于评价加固效果。
Seams and their variations reflect the deformation and failure of shield tunnel segments. Based on the experimental images of composite tunnels reinforced with shield tunnels, the morphological parameters of the joint are characterized by the regional characteristic parameters and the boundary characteristic parameters. The regional characteristic parameters include the total number of pixels in the joint region, the long axis and the short axis, which are equivalent Diameter and the included angle to the horizontal axis, the boundary features include geometric parameters and Fourier transform parameters, and the variation characteristics of these parameters before and after reinforcement are studied. The results show that the changes of eccentricity, long axis and short axis of the joints before and after the reinforcement are relatively stable, which are difficult to evaluate the reinforcement effect. The joint area, the equivalent diameter of joints, the intersection angle with the X axis, the circularity, the shape index, The former changes rapidly, and is relatively stable after the reinforcement, which can be used to evaluate the reinforcement effect. The edge angle index and the texture coefficient of the seams change rapidly before reinforcement and are very stable after reinforcement, and these two parameters can be well used for evaluating the reinforcement effect .