Table 7 Significant analysis of the influence of six factors on undrained cohesion and moisture content of the clay.

Response variable	Source	Coefficient	\(P\) value	Significance
\(y_{{c_{U} }}\)	Model		0.002	**
	\(x_{5}\)	0.615	0.000	**
	\(x_{5}^{2}\)	0.022	0.000	**
\(y_{{c_{M} }}\)	Model		0.001	**
	\(x_{1}\)	− 0.616	0.001	**
	\(x_{3}\)	− 0.120	0.012	*
	\(x_{4}\)	− 0.577	0.000	**
	\(x_{6}\)	− 0.373	0.001	**
	\(x_{1} x_{6}\)	0.017	0.002	**
\(y_{{c_{L} }}\)	Model		0.001	**
	\(x_{1}\)	− 0.542	0.001	**
	\(x_{3}\)	− 0.109	0.009	**
	\(x_{4}\)	− 0.511	0.000	**
	\(x_{5}\)	− 0.125	0.003	**
	\(x_{6}\)	− 0.337	0.001	**
	\(x_{1} x_{6}\)	0.016	0.001	**
\(y_{{\omega_{U} }}\)	Model		0.001	**
	\(x_{3}\)	0.053	0.030	*
	\(x_{4}\)	0.253	0.000	**
	\(x_{6}\)	− 0.185	0.005	**
	\(x_{6}^{2}\)	0.003	0.002	**
\(y_{{\omega_{M} }}\)	Model		0.000	**
	\(x_{4}\)	0.500	0.000	**
	\(x_{6}\)	− 0.128	0.050	*
	\(x_{6}^{2}\)	0.002	0.031	*
\(y_{{\omega_{L} }}\)	Model		0.000	**
	\(x_{4}\)	0.520	0.000	**
	\(x_{6}^{2}\)	0.003	0.021	*

where, “*” means generally significant difference at \(P\) < 0.05 level; “**” means extremely significant difference at \(P\) < 0.01 level; \(F\) values of the model for undrained cohesion \(y_{{c_{U} }}\), \(y_{{c_{M} }}\), \(y_{{c_{L} }}\) and moisture content \(y_{{\omega_{U} }}\), \(y_{{\omega_{M} }}\), \(y_{{\omega_{L} }}\) were 5.703, 5.910, 6.090, 6.299, 11.719 and 9.940, respectively.

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