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Abstract Fluid-solid coupling models were established based on the unsaturated soil mechanics. The pore water pressure distribution and unsaturated soil strength were applied to the limit equilibrium method considering the soil-water characteristic curves and the seepage characteristics. Combined with the finite element method，the numerical computations to the seepage，the stability and the stress-strain with saturated and unsaturated properties under steady-transient conditions were carried out to Gongjiafang colluvial landslide under the action of reservoir water in Wuxia gorge section，Three-Gorges reservoir. The Seep module was used to simulate the influence of water on landslide and the change of underground water levels. The calculations of the limit equilibrium and stability of the fluid-solid coupling were carried out with Geostudio-slope. The Sigma software was applied to analyze the unsaturated-unsteady seepage，stresses and strains. The dissipation of the pore water pressure difference，the time effect of seepage line lagging behind the reservoir water and the space effects of the mutual impact between the moisture migration and soil deformation in the slope were revealed. The water in the slope played a role of jacking，wedging and actuation. The hydrops in the top tensile crack is disadvantage to slope stability. The leading edge of the slope was steady while the middle and latter edge played a role of pushing and controlled the overall stability，which reflected the protective effect of the anti-slide piles under the coupled action of seepage- stress.
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2016, Vol. 35 
