Table 2: Shear strength parameters of natural expansive soils under wet-dry cycles with loading.

Number of wet-dry cyclesNonlinear fitting parametersThe intercept of nonlinear fitting curve (kPa)Mohr strength parameters (75–300 kPa)
ATnAdj. R2c′ (kPa)φ′ (°)R2

00.56650.46170.98890.995626.730.428.50.997
20.61110.25350.94950.990616.823.728.60.986
40.69000.07240.87310.98987.121.628.40.988
60.70740.00940.84170.99531.419.328.10.994
80.71760.00000.84440.99040.020.828.20.985