9Xu Y F, Sun D A. Determination on of expansive soil strength using a fractal model[ J ]. Fractals, 2001,9 ( 1 ) : 51-60.
10Fredlund D G, Xing A, Fredlund M D. The relationship of the unsaturated soil shear strength function to the soil-water characteristics[J]. Can. Geotech, 1996,33(3):440-448.
8[1]Xu Y F, Sun D A. Determination on of expansive sofl trength using a fractal model[J ]. Fractals, 2001, 9(1): 51-60.
9[2]Fredlund D G, Xing A, Fredlund M D. The relationship of the unsaturated soil shear strength function to the soil water characteristics[J ]. Can. Geotech. J., 1996,33(3): 440-448.
10[3]Fredlund D G, Rahardjo H. Soil Mechanics for Unsaturated Soils[M]. New York: Wiley & his sors, 1993.
