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CRTS II型无砟轨道板在长期服役状态下,表面产生裂纹,其位置和方向多种多样。从现场调查情况可以看出,轨道板在承轨台邻近处横向裂纹尤为突出。运用图像处理技术和分形理论对轨道板横向裂纹扩展特性进行分析。计算分析表明:承轨台受荷载作用集中,邻近处轨道板易产生裂纹;轨道板内预应力钢筋边缘易产生先开裂现象,并且裂纹沿着预应力钢筋方向扩展;轨道板裂纹具有分形特征,分形维数随裂纹长度增长而增大,可以作为轨道板裂纹扩展的特征属性指标。
CRTS Type II ballastless track slabs produce cracks on the surface during long service life with a variety of positions and orientations. It can be seen from the field investigation that the transverse crack of the track plate is particularly prominent in the vicinity of the bearing rail. The application of image processing technology and fractal theory to analyze the transverse crack propagation characteristics of track slabs. The calculation and analysis show that: the load-bearing function of the rail-bearing platform is concentrated and the adjacent rail plates are easy to crack; the edge of the prestressed steel plates in the rail plate tends to crack first and the crack propagates along the direction of the prestressed steel; the crack of the rail plate has the fractal characteristic, The fractal dimension increases with the increase of crack length, which can be used as an index of the attribute of the crack propagation in the track slab.