Table 5 Change of characteristic parameters for different gradations.

Contact type	Loading conditions	Gradation characteristic parameters
Contact type	Loading conditions	d₁₀	d₃₀	d₅₀	d₆₀	C_u	C_c	S_m
Sand 1#-4C0 pile	Original gradation	2.30	2.90	3.50	3.80	1.65	0.96	3.66
Sand 1#-4C0 pile	100 kPa	1.03	2.49	3.21	3.57	3.46	1.69	3.46
Sand 2#-4C0 pile	Original gradation	0.49	1.22	2.00	2.60	5.26	1.16	3.21
Sand 2#-4C0 pile	100 kPa	0.22	0.68	1.56	2.08	9.26	1.00	3.03
Sand 3#-4C0 pile	Original gradation	0.22	0.37	0.52	0.78	3.61	0.81	2.76
Sand 3#-4C0 pile	100 kPa	0.15	0.32	0.44	0.50	3.32	1.36	2.66
Sand 4#-4C0 pile	Original gradation	0.17	0.31	0.40	0.45	2.70	1.26	2.66
Sand 4#-4C0 pile	100 kPa	0.13	0.28	0.37	0.41	3.04	1.42	2.54

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