Mixing Ratios and Cementing Mechanism of Similar Silty Mudstone Materials for Model Tests

Table 9

Variance analysis of density.

Factor	A (water content)	B (barite powder ratio)	C (gypsum mass)	D (clay mineral ratio)	Error
Variance value S^2	0.057	0.009	0.031	0.003	0
Degrees of freedom F	3	3	3	3	3
Univariate significance	19.000	3.000	10.333	1.000
	Significant	Insignificant	Significant	Insignificant

Note. S² represents the mean of the density variance value corresponding to level i of a factor; .