Effect of Clay on Internal Erosion of Clay-Sand-Gravel Mixture

Table 3

Critical flow velocity and critical hydraulic gradient of CFC and FC groups.

	CFC-1	FC-1	CFC-2	FC-2	CFC-3	FC-3
Blockage critical hydraulic gradient	0.15	0.27	0.36	0.42	0.44	0.74
Blockage critical velocity (cm/s)	0.0291	0.284	0.0251	0.0202	0.017	0.01
Failure critical hydraulic gradient	0.31	0.49	0.56	0.64	0.59	1.09
Failure critical velocity (cm/s)	0.036	0.033	0.0243	0.0194	0.01437	0.0109