Issue 53

A. Kostina et alii, Frattura ed Integrità Strutturale, 53 (2020) 394-405; DOI: 10.3221/IGF-ESIS.53.30 401 1 1 2 2 2 3 , ,         d p p p d d p p p The intervals for the coefficients for each material were set reasoning from the best agreement with the numerical simulation data. Approximations of the parameters k and d for each material are given in Tab. 9 and 10. The calculated results for the designed ice wall thickness for chalk, clay and sand obtained by new Eqn. (20) are presented in Fig.4. Soil k 1 k 2 p 1 , MPa p 2 , MPa p 3 , MPa Sand 2.337 0.319 1.557 4.889 8.222 Chalk 1.186 0.909 0.626 1.881 3.135 Clay 0.624 1.052 0.678 2.301 3.925 Table 9: Approximation of the coefficient k . Soil d 1 d 2 p 1 , MPa p 2 , MPa p 3 , MPa Sand -6.674 5.648 1.557 4.889 8.222 Chalk -0.847 0.760 0.626 1.881 3.135 Clay 2.516 -0.387 0.678 2.301 3.925 Table 10: Approximation of the coefficient d . (a) (b) (c) Figure 4 : Approximation of Eqn. (4) (solid lines) by the piecewise-linear functions (dashed lines) for sand (a), chalk (b) and clay (c).