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Table 2 Experimental conditions of the triaxial tests presented in this study

From: Geotechnical behavior of mudstones from the Shimanto and Boso accretionary complexes, and implications for the Nankai accretionary prism

Sample

Experimental type

Confining pressure [MPa]

Pore pressure [% confining pressure]

Pore pressure [MPa]

Strain [%]

Peak stress [MPa]

Sch2011/23

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

1 - 1.25 - 1.49 - 1.8 - 2.1

94.6 - 110–120 - 132–136.5

Sch2011/24

PPST

55

80 - 50 - 25

44.0 - 27.5 - 14.0

1.8 - 2.4 - 3.4

126.4 - 157.7 - 184.3

Sch2011/34

PPST

65

90 - 60 - 30

58.0 - 39.0 - 19.5

0.48 - 1.4 - 3.8

105 - 139.5 - 186.4

Sch2011/27-2

PPST

55

80 - 50 - 25

44.0 - 27.5 - 14.0

1.4 - 2–2.7

173 - 156–173.7

Sch2011/27-1

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

0.2 - 0.4 - 0.78 - 1.2 - 1.6

102 - 115–131 - 142–155.8

Sch2011/29-2

CPST

25 - 35–45 - 55

80

20 - 28–36 - 44

0.8 - 1–1.1 - 1.2

120 - 104.3 - 123.6 - 141

Sch2011/18-2

PPST

55

90 - 60 - 30

49.5 - 33.0 - 16.5

0.4 - 3.4 - 4.7

240 - 248.8 - 246.7

Sch2011/8

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

0.4 - 0.6 - 1.2 - 1.7 - 2

172.7 - 157.8 - 141–150.6 - 155.6

Sch2011/12

PPST

55

90 - 60 - 30

49.5 - 33.0 - 16.5

0.4 - 2.3 - 4.7

96 - 157–223.7

NZ-PS-1/1

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

0.78 - 1–1.3 - 1.5 - 1.7

40.6 - 53.3 - 64.3 - 74.8 - 86

NZ-PS-1/2

PPST

55

90 - 60 - 30

49.5 - 33.0 - 16.5

0.8 - 1.9 - 2.7

76.1 - 74.3 - 73.3

NZ-PS-2

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

0.9 - 1.2 - 1.4 - 1.8 - 2

37.9 - 48.1 - 58.3 - 70.7 - 81.1

NZ-PS-4/1

CPST

25 - 35

80

20 - 28

1 - 1.2

55.8 - 66.1

NZ-PS-4/2

CPST

25 - 35

80

20 - 28

1.3 - 1.7

50.3 - 64.8

NZ-PS-5

CPST

25 - 35–45 - 55 - 65

80

20 - 28–36 - 44 - 52

0.6 - 0.8 - 1.0 - 1.2 - 1.4

41 - 53.4 - 62.6 - 75–87.2

NZ-PS-5-C

Cyclic test

55

80

44

0.9 to 1.17

69 to 70.2

  1. In the confining pressure stepping tests (CPST), the confining pressure was increased in up to five steps, while in the pore pressure stepping tests (PPST), the pore pressure conditions were decreased in three steps. Confining and pore pressure conditions, achieved strains, and peak stresses are given for each step. Results of samples that failed during triaxial deformation experiments are given in italics. These values are not further considered.