Table 7 Identification parameters of pre-peak unloading damage model under yield stress conditions.

From: Experimental study on uniaxial creep characteristics of sandstone with pre-peak unloading damage

σ/MPa

σul/%

EH(U)/MPa

EY(U)/MPa

ηY(U)/MPa

ηN(U)/MPa

λ

θ

50

50

3.517

278.3

80.24

148.1

2.055

159.8

42.5

60

3.243

198.2

19.5

102.9

2.072

163.11

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