X-Ray CT Investigation on Fractal Characteristics of Fine-Grained Tailing Sand in Fujian’s Makeng: Insight into the Mesoscopic Seepage Failure

Table 2

Grading constants of tailing sand of different groups.

Groups	(μm)	(μm)	(μm)	(μm)
First	47.12	83.88	118.15	147.96	3.14	1.01
Second	47.16	64.22	119.75	137.96	2.92	0.63
Third	30.49	63.32	91.7	106.85	3.50	1.23
Fourth	20.15	37.75	53.37	61.58	3.06	1.15
Fifth	39.78	78.87	112.96	136.03	3.42	1.15

: the mass of soil particles smaller than this size is 10% of the total mass of tailing sand particles, which is the effective particle size. : the mass of soil particles smaller than this size is 30% of the total mass of tailing sand particles, which is the median particle size. : the mass of soil particles smaller than this size is 50% of the total mass of tailing sand particles, which is the average particle size. : the mass of soil particles smaller than this size is 60% of the total mass of tailing sand particles, which is the constrained grain size. is the soil coefficient of uniformity obtained from the grain size distribution curve. is the soil curvature coefficient obtained from the grain size distribution curve.