Table 5 Comparison Results of Instability Scale for Hard Rock Formations.

From: Overlying strata movement law and rockburst prevention & control for fully mechanized top coal caving face in extra-thick coal seams

 

Theoretical calculations

result

Numerical simulation

result

On-site measurement

result

ratio between theory and field measurement

ratio between numerical simulation and field measurement

Initial instability scale of low-lying hard rock formation/m

20.25

20.00

23.75

14.74%

15.79%

Periodic instability scale of low-lying hard rock formations/m

8.27

8.00

6.72

23.07%

19.05%

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