Table 1 Numerical model parameter list.

From: Breaking law of overburden rock and key mining technology for narrow coal pillar working face in isolated island

Lithology

Poisson’s ratio

Elastic modulus/Gpa

Internal friction angle/°

Cohesion /Mpa

Tensile strength/Mpa

Medium sandstone

0.26

31

32.2

22.9

8.71

Sandy mudstone

0.30

28.5

32

18.5

6.2

Fine sandstone

0.25

50

37.8

34.5

8.79

Mudstone

0.33

16.3

32

15.4

5.34

Coal

0.32

23.1

34

14.8

2.6

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