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

Table 13

ANOVA table for unconfined compressive strength.

Factors	Square of deviance	Degree of freedom	Mean square	F ratio	F critical value	Significant
Coal gangue	44766.681	2	22383.341	270.513	F0.01 (2, 2) = 99
Fly ash	13970.503	2	6985.2515	84.420	F0.05 (2, 2) = 19
Lime	55619.083	2	27809.542	336.091	F0.1 (2, 2) = 9
Error	165.488	2	82.744		F0.25 (2, 2) = 3
Sum	114521.75	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.