考虑渗透各向异性的动水压力型滑坡变形响应规律OA

Landslides induced by hydrodynamic pressure constitute significant geological hazards during the operation of the Three Gorges Reservoir.Due to their loose structure,high void ratio,and strong permeability,the sliding mass exhibits pronounced permeability anisotropy.To investigate the influence of permeability anisotropy on the deformation response of hydrodynamic pressure-induced landslides,the Baijiabao landslide in the Three Gorges Reservoir area is studied.The permeability coefficient ratio kx/ky is used to characterize permeability anisotropy.The variations in landslide surface displacement and time lag under different permeability coefficient ratios kx/ky and reservoir drawdown rates v are systematically analyzed.The results are as follows:①As the ratio of hydraulic conductivities kx/ky increases,the phreatic line in the front part of the landslide rises,the hydraulic head difference inside and outside the landslide mass increases simultaneously,and the seepage force directed outward from the slope increases accordingly.②At constant v,higher kx/ky ratios increase both surface displacement and deformation hysteresis time.When 0.1<kx/ky≤10,the growth rates of surface displacement increment and hysteresis time are significant.Beyond kx/ky>10,these values stabilized.③The leading edge exhibits higher sensitivity to permeability anisotropy and v than mid-rear sections.Under constant v,displacement increments at leading-edge monitoring points surpass those at rear sections.These results provide significant practical value for deformation analysis and early warning of hydrodynamic pressure-induced landslides.