Issue34

Y. Li et alii, Frattura ed Integrità Strutturale, 34 (2015) 599-607; DOI: 10.3221/IGF-ESIS.34.66 605 cycle, the law reverses. After the first dry-wet cycle, the internal friction angle of sample 2 is 9.76 ° , the largest of the three samples. Number of dry-wet cycles: 1 2 3 4 5 Sample 1 Crack ratio 0 1.65% 2.57% 3.27% 3.63% Fractal dimension 0 0.632 0.783 1.012 1.133 Cohesive force / kPa 39.38 38.21 36.14 29.57 19.05 Internal friction angle /° 8.82 8.56 8.49 7.88 7.26 Sample 2 Crack ratio 2.25% 2.77% 3.86% 6.55% 8.03% Fractal dimension 0.688 0.853 1.016 1.193 1.417 Cohesive force / kPa 38.57 37.89 34.77 30.09 18.66 Internal friction angle /° 9.76 9.29 9.03 8.56 7.12 Sample 3 Crack ratio 0 2.14% 2.92% 3.37% 3.77% Fractal dimension 0 0.963 1.076 1.167 1.257 Cohesive force / kPa 38.04 33.05 27.39 19.33 13.77 Internal friction angle /° 9.06 8.66 7.69 7.13 6.68 Table 5 : Test results of the relationship between crack ratio, fractal dimension and shear strength. Figure 3: The relationship between crack ratio and cohesive force. Figure 4: The relationship between crack ratio and internal friction angle.