and serves as an important index for the prediction and
evaluation of a landslide (He, 2005). On the one hand, soils in sliding
zone are basically unsaturated due to rainfall infiltration or
water level fluctuation of reservoir (Riemer, 1992; Furuya et al.,
1999; Wang et al., 2008); on the other hand, a large number

of cases show that the deformation of landslides always takes a

long period of time, which means that time-dependent properties

of landslide soils are observed. According to this understanding,

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 Supported by the National Natural Science Foundation of China (50879044)
and Master’s Degree Thesis Excellent Training Funds of Three Gorges University