Experimental Study on Physical-Mechanical Properties of Expansive Soil Improved by Multiple Admixtures

Table 11

ANOVA table for shear strength.

Factors	Square of deviance	Degree of freedom	Mean square	F ratio	F critical value	Significant
Coal gangue	1240.027	2	620.0135	2.737	F0.01 (2, 2) = 99
Fly ash	439.807	2	219.9035	0.971	F0.05 (2, 2) = 19
Lime	2586.660	2	1293.33	5.709	F0.1 (2, 2) = 9	O
Error	453.087	2	226.5435		F0.25 (2, 2) = 3
Sum	4719.58	8

In ANOVA, if the mean square value of a factor is less than or equal to the error mean square, it will be treated as the error term, and F value will not be calculated, where “” means very significant , “” means significant 0.01 ≤ , “” means relatively significant 0.05 ≤ , and “O” means that 0.1 ≤  has a certain influence.