Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully

Table 4

Volumetric strain-hydrostatic pressure relationship of the gob material.

Volumetric strain	Hydrostatic pressure, Pa	Volumetric strain	Hydrostatic pressure, Pa
0	0	0.12	17725587.81
0.01	711498.289	0.13	21284942.79
0.02	1493364.541	0.14	25710086.82
0.03	2356581.038	0.15	31360655.35
0.04	3314540.81	0.16	38827478.06
0.05	4383747.523	0.17	49153934.99
0.06	5584774.241	0.18	64371871.52
0.07	6943600.091	0.19	89035423.82
0.08	8493510.825	0.20	135896173.2
0.09	10277861.84	0.21	259438148.8
0.10	10277861.84	0.22	1494857905
0.11	14800573.32