Surficial Failure of Expansive Soil Cutting Slope and Its Flexible Support Treatment Technology

Table 2

Shear strength parameters of natural expansive soils under wet-dry cycles with loading.

Number of wet-dry cycles	Nonlinear fitting parameters				The intercept of nonlinear fitting curve (kPa)	Mohr strength parameters (75–300 kPa)
	A	T	n	Adj. R^2		c′ (kPa)	φ′ (°)	R^2
0	0.5665	0.4617	0.9889	0.9956	26.7	30.4	28.5	0.997
2	0.6111	0.2535	0.9495	0.9906	16.8	23.7	28.6	0.986
4	0.6900	0.0724	0.8731	0.9898	7.1	21.6	28.4	0.988
6	0.7074	0.0094	0.8417	0.9953	1.4	19.3	28.1	0.994
8	0.7176	0.0000	0.8444	0.9904	0.0	20.8	28.2	0.985