6Wu S R,Jin Y M,Zhang Y S,et al. Investigations and assessment of the landslide hazards of Fengdu county in the reservoir region of the Three Gorges Project on the Yangtze River[J]. Environmental Geology,2004,45 :560-566.
7Baum R L,Coe J A,Godt J W,et al. Regional landslidehazard assessment for Seattle,Washington,USA[J]. Landslides, 2005,4:266-279.
8Carrara A,Pike R J. GIS technology and models for assessing landslide hazard and risk[J] Geomorphology,2008,94(3/4):257-260.
9Cokca E, Erol O, Armangil F. Effects of compaction moisture content on the shear strength of an unsaturated clay[J]. Geotechnical and Geological Engineering, 2004,22 : 285-297.
10Pefect E,Mchaughlin N B, Kay B D,et al. An improved equation for the soil water retention curve[J]. Water Resour Res. , 1996,32 : 281-287.