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Earth, Planets and Space

Table 3 Effective shear parameters determined from the triaxial tests

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

Sample

Mohr-Coulomb

Stress path

Fracture angle

φ[°]

C[MPa]

φ′ [°]

C′ [MPa]

φf[°]

Cf[MPa]

Sch2011/23

46.8

14

45.15

15.4

47.6

12.8

Sch2011/24

30.96

30

33.44

30.04

21.8

42.3

Sch2011/34

29.68

27

30.83

25.18

  

Sch2011/27-1

49.47

14

49.45

13.2

43.6

19.06

Sch2011/27-2

    

23.2

52.3

Sch2011/29-2

    

9

58.48

Sch2011/8

    

31.68

45.68

Sch2011/12

41.5

17

41.42

16.55

40

18.6

NZ-PS-1

46.66

3

46.68

2.89

  

NZ-PS-2

47.07

2

46.28

2.31

  

NZ-PS-4/1

  

45.64

6.14

  

NZ-PS-4/2

  

50.9

2.65

  

NZ-PS-5

47.07

3

47.14

2.62

  

K004

27.1

0.0257

    

K005

24.6

0.0249

    

K011

35.8

0.0121

    

K013

32

0.0293

    

K014

28.7

0.0341

    

K015

25.3

0.0497

    

K016

40.4

0.0042

    

K020

26.3

0.041

    

K022

21.5

0.0354

    
  1. The Shimanto Belt samples (coded Sch2011) and the Boso accretionary prism samples (coded NZ-PS) were tested in this study, while the data from the Nankai samples (coded K) are taken from Stipp et al. (2013). Effective shear parameters were determined using Mohr-Coulomb criteria, stress path diagrams or fracture angle measurements.
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