Issue34

Y. Li et alii, Frattura ed Integrità Strutturale, 34 (2015) 599-607; DOI: 10.3221/IGF-ESIS.34.66

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 0 0

2

3

4

5

Crack ratio

1.65% 0.632 38.21 2.77% 0.853 37.89 2.14% 0.963 33.05 8.56 9.29

2.57% 0.783 36.14 3.86% 1.016 34.77 2.92% 1.076 27.39 8.49 9.03

3.27% 1.012 29.57 6.55% 1.193 30.09 3.37% 1.167 19.33 7.88 8.56

3.63% 1.133 19.05 8.03% 1.417 18.66 3.77% 1.257 13.77 7.26 7.12

Fractal dimension Cohesive force / kPa

Sample 1

39.38

Internal friction angle /° 8.82

Crack ratio

2.25% 0.688 38.57

Fractal dimension Cohesive force / kPa

Sample 2

Internal friction angle /° 9.76

Crack ratio

0 0

Fractal dimension Cohesive force / kPa

Sample 3

38.04

Internal friction angle /° 9.06 6.68 Table 5 : Test results of the relationship between crack ratio, fractal dimension and shear strength. 8.66 7.69 7.13

Figure 3: The relationship between crack ratio and cohesive force.

Figure 4: The relationship between crack ratio and internal friction angle.

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