Table 4 Internal friction angle and cohesive force of coal samples with different water immersion times.

From: Study on the strength deterioration characteristic and damage model of coal pillar dams with repeated water immersion in underground reservoirs

Number of immersion (time)

Internal friction angle (°)

Cohesive force (MPa)

0

29.13

12.09

1

29.62

9.53

2

28.79

9.02

3

28.67

8.06

4

28.26

7.76

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