Table 4 Fuzzy random optimization of the Burgers creep damage model parameters (σ > σs).

From: Optimization of Burgers creep damage model of frozen silty clay based on fuzzy random particle swarm algorithm

Temperature (°C)

Optimization results for creep parameters

\({E}_{1} (\)MPa)

\({E}_{2} (\)MPa)

\({E}_{3} (\)MPa)

\({\eta }_{2} (\)MPa·h)

\({\eta }_{3} (\)MPa·h)

\({R}_{1}\)

\({R}_{2}\)

 − 10

376.35

265.42

235.18

508.65

317.09

0.167

0.295

 − 15

281.04

219.65

204.92

437.20

152.34

0.258

0.384

 − 20

235. 92

158.23

176.35

362.59

114.26

0.391

0.560

 − 25

213.68

94.77

152.46

309.12

93.85

0.514

0.672

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