An Experimental Study with Model Calibration for the Permanent Strain of Granite Residual Soil Subgrade under Drying-Wetting Cycles

Table 4

Survey of permanent axial strain fitting methods.

Fitting models	References	Advantages	Disadvantages
	Barksdale [32]	Few parameters and simple model form	(1) Models: poor fit accuracy at the later stage (the strain tends to be stable, but the fitting value is still rising); (2) Parameters: no physical meaning; (3) Ignore the effects of stress history and environmental change
	Monismith et al. [33]
	Li and Selig [34]
	Zhang et al. [35]
	Paute et al. [36] and Nie et al. [27]	Two-stage fitting model; High accuracy	(1) Difficult to determine the boundary of different strain stages; (2) Ignore the effect of stress history
				Chai and Miura [37]	Considering the dynamic stress level	(1) Models: complex form; (2) Parameters: difficult to determine
				Gidel et al. [38]