Analysis on the Influence of Fault Protection Coal Pillar Size on Rockburst

Table 2

Statistical table of peak stress and stress concentration coefficient.

Coal pillar size (m)	10	20	30	40	50
Peak stress (MPa)
Working face in upper wall	39.2	37.5	36.1	35.1	34.3
Working face in footwall	52.0	45.5	40.3	36.6	34.5
Stress concentration coefficient
Working face in upper wall	1.70	1.63	1.57	1.53	1.49
Working face in footwall	2.26	1.98	1.75	1.59	1.50