During the water level fluctuation period of the Three Gorges reservoir area,the seepage stress coupling characteristics of the geotechnical body in the landslide have a great influence on the stability of the landslide.In this paper,a one-dimensional seepage test was conducted on the sliding-zone soil of Majiagou landslide.It tested the relationship between the seepage velocity of the soil and the hydraulic gradient and found the seepage characteristics of the seepage pressure p loading and unloading process.It also performed triaxial consolidation tests under steady-state and cyclical p and analyzed the effects of the confining pressure σ3,the amplitude of the p,and the loading process on the permeability coefficient k and the volume strain.The following conclusions were drawn.(1)During the loading process,the seepage flow in the soil conforms to Darcy's law when the p was less than a certain threshold value,and the seepage flow shows nonlinearity when the p exceeds the threshold.The seepage flow conforms to Darcy's law when the p was unloaded.(2)When under a steady p,the k of soil is linear to the logarithm of the σ3.Its instantaneous modulus influence coefficient decreases exponentially when the p increases.(3)When under a cyclical p,the k of soil decreased exponentially as the number of fluctuations increases.And a rebound effect of expansion and then compression appears in the specimens in each cycle.The rebound of accumulated deformation occurs at a certain time point,which is almost consistent with the threshold value in the fitting function of the k and the number of cycles under the same conditions.
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