A Practical Swelling Constitutive Model of Anhydrite and Its Application on Tunnel Engineering

Table 4

Summary fits of swelling stress-strain of nine samples for the logarithmic model and the quadratic model.

No	Logarithmic model:			Quadratic model:
		K	R-square	p		R-square
1	329.60	0.0107	0.8989	3.077E − 7	151.00	0.8822
2	381.30	0.0177	0.9538	6.915E − 8	365.00	0.9940
3	650.00	0.0188	0.9327	4.587E − 8	487.30	0.9841
4	830.00	0.0311	0.9490	3.243E − 8	600.00	0.9937
5	668.00	0.7403	0.8796	4.255E − 8	632.90	0.9919
6	759.80	0.0362	0.8692	3.004E − 8	758.30	0.9988
7	1020.0	0.0357	0.8761	1.792E − 8	1050.0	0.9840
8	1171.0	0.0352	0.8826	2.100E − 8	985.30	0.9904
9	1233.0	0.0407	0.9815	1.169E − 8	1315.0	0.9599