8BASMA A A, Al-HOMOUD A S, HUSEIN MALKAWI A I, et al. Swelling-shrinkage behavior of natural expansive clays[J]. Applied Clay Science, 1996, (11): 211 -227.
9ALONSO E E. Modeling the mechanical behaviour of expansive clays[J]. Engineering Geology, 1999, 54: 173-183.