Comparison of Uplift Capacity and Nonlinear Failure Surfaces of Single-Belled Anchor in Homogeneous and Layered Sand Deposits

Table 5

Independent variables, coefficients, standard error, t_statistics, and t_critical of all the parameters from models (18) to (21).

Parameters	Coefficients	Standard error	t statistics	tcritical = t(0.975,54)
In accordance with model (18)
L/Db	+1.67	0.11	14.54	2.01
Ds/Db	−4.19	1.43	2.93
a	−2.96	0.41	7.13
In accordance with model (19)
L/Db	+1.48	0.10	14.62	2.01
Ds/Db	−4.61	1.21	3.80
a	−2.97	0.36	8.16
In accordance with model (20)
L/Db	+1.17	0.08	15.27	2.01
Ds/Db	−2.70	1.00	2.69
a	−2.26	0.29	7.84
Parameters	Coefficients	Standard error	t statistics	tcritical = t(0.975,248)
In accordance with model (21)
L/Db	+1.43	0.74	19.47	1.979
Ds/Db	−3.62	0.94	3.85
β	−0.06	0.01	11.23
a	−2.71	0.26	10.27