Table 14 Mechanical parameters of bonding between particles.

From: Research on coal rock parameter calibration based on discrete element method

Types of bonded particles

Normal stiffness (N/m3)

Tangential stiffness (N/m3)

Maximum normal stress (MPa)

Maximum tangential stress (MPa)

Coal 1and Coal 1

1.3008 × 108

1.0104 × 108

7.7841

2.0147

Coal 2 and Coal 2

1.3547 × 108

1.0954 × 108

12.571

5.0147

Coal 1 and Gangue 1

1.5519 × 108

1.2415 × 108

17.003

7.5010

Coal 1 and Gangue 2

1.9537 × 108

1.5629 × 108

17.615

7.4213

Coal 1 and Gangue 3

2.1842 × 108

1.7473 × 108

18.003

7.3948

Coal 1 and Roof

2.3017 × 108

1.8415 × 108

18.543

7.3865

Gangue 1and Gangue 1

2.1426 × 108

1.7140 × 108

26.379

13.295

Gangue 2 and Gangue 2

7.4136 × 108

5.9309 × 108

27.563

12.793

Gangue 3 and Gangue 3

1.0678 × 109

8.5425 × 108

28.179

12.592

Roof and Roof

2.2017 × 109

1.8775 × 109

28.936

12.174

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