Table 3 Evolution analysis of strain energy density of rock under true triaxial compression.

From: Calculation method and evolution rule of the strain energy density of sandstone under true triaxial compression

Sample number

σ1/MPa

Strain energy density/(mJ mm-3)

u1

\(u_{1}^{e}\)

\(u_{1}^{{\text{d}}}\)

u2

\(u_{2}^{e}\)

\(u_{2}^{{\text{d}}}\)

u3

\(u_{3}^{e}\)

\(u_{2}^{{\text{d}}}\)

S1

40

0.1671

0.0850

0.0821

0.1103

0.0673

0.0430

0.0698

0.0387

0.0311

S2

60

0.3016

0.1641

0.1375

0.1076

0.0615

0.0461

0.0679

0.0346

0.0333

S3

76.5

0.4382

0.2227

0.2155

0.1048

0.0556

0.0492

0.0660

0.0307

0.0353

S4

115

0.8483

0.4479

0.4004

0.1014

0.0494

0.0520

0.0633

0.0248

0.0383

S5

153

1.4656

0.7849

0.6807

0.0951

0.0370

0.0581

0.0603

0.0180

0.0423

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