A Fluid-Solid Coupling Mathematical Model of Methane Driven by Water in Porous Coal

Table 4

Space-time distribution of the pore pressure gradient at the axial monitoring points.

Time (min)	Monitoring point (mm)
	0	10	20	30	40	50	60	70	80	90	100
	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)	Pore pressure (MPa/m)
10	4.623	4.119	3.720	3.422	3.225	3.135	3.719	4.893	6.946	11.455	41.869
20	4.806	4.325	3.966	3.704	3.526	3.423	3.930	5.049	6.944	10.963	36.354
30	4.947	4.460	4.091	3.817	3.622	3.497	3.981	5.071	6.899	10.751	34.594