Translational landslides occur in nearly horizontal strata and groundwater plays a crucial role in their initiation and subsequent movement.This study aimed to explore the correlation between the hydraulic distribution on the shear plane and the initiation of the landslides.Using the Shizishan Landslide in Chengdu City as a geotechnical model,a bespoke apparatus was de-veloped for hydraulic testing.The experiment measured the hydraulic pressure at various points along the base sliding plane of nearly horizontal angles from 0° to 10°,under two penetration conditions,to investigate the distribution pattern of hydrostatic pres-sure.The outcomes revealed that:①Under poor permeability on a bottom sliding plane or the landslide's front was obstructed,the hydraulic pressure exhibited a trapezoidal distribution.Conversely,under free-flow conditions,the hydraulic pressure decreased in a curvilinear pattern along the basal sliding plane,with the decreasing rate first ascending and then slowing from the rear to the front.The steeper the angle of the basal sliding plane,the more notable the decreasing rate change.②Hydraulic uplift pressure in interlayer fractures was found to be around 27.6%less than the pressures calculated using traditional triangular distribution mod-els.③ The softening and deformation of thin layers of mudstone were the root causes of landslide initiation.Specifically,the trigger for landslide initiation was the result of intense rainfall causing uplift pressure on the bottom and high-pressure water within the rear-edge fractures,which worked in tandem to thrust the landslide mass.These findings can offer an important reference for the stability analysis,assessment,and remediation plans for translational landslides.
关键词
平推式滑坡/水力分布/承压水/孔隙水压力/启动机理/工程地质
Key words
translational landslide/hydraulic distribution/confined water/pore water pressure/initiation mechanism/engi-neering geology
维普
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