Experimental Investigation of Water-Sand Mixed Fluid Initiation and Migration in Filling Fracture Network during Water Inrush

Table 2

Experimental scheme 2.

Number	Upstream pressure (MPa)	Angle (°)	Quartz sand size (mm)	Porosity of skeleton (%)	Aeolian sand size (mm)	Average size (mm)	Porosity of filled sand (%)
FF11	0.2	30	2.36–9.0	43.71	0.000–0.075	0.0375	21.14
FF12					0.075–0.150	0.1125
FF13					0.150–0.300	0.225
FF14					0.300–0.600	0.45