Strength Characteristics and Slope Stability of Expansive Soil from Pingdingshan, China

Table 4

The parameters of stable shear strength when the control water content is 25%.

Water content variation range (%)	Angle of internal friction (°)	Cohesive force (kPa)
32.0∼13.3	9.2	20.6
32.0∼17.6	7.5	44.8
32.0∼25.0	8.3	35.9
29.6∼15.0	7.5	40.0
29.6∼16.8	9.7	38.4
29.6∼18.5	10.3	44.3
27.4∼16.0	10.1	39.9
27.4∼17.3	11.5	45.3
27.4∼18.2	13.3	40.5