Analysis Of Excavation Stability And Reinforcement Effect Of Soft Interlayer Slope

This paper regards the slope of a fishway shipping hub of excavation engineering as the research background.Firstly,the failure modes and failure mechanism of slope failure modes and the slope stability are analyzed with the research method of combining centrifugal model test and numerical calculation;and then,the stability of the slope after excavation is analyzed with the same method.After that,the slope of the excavation is reinforced by anti slide pile and the author analyzes the effect of anti slide pile and carries on a research on the influence factors of the stability of slope reinforced by anti slide pile.The main research results and conclusions are as follows:(1)The slope with no weak interlayer is a fracture and slip failure mode.The deformation and failure mode of the slope with a horizontal weak layer is the sliding mode.The failure mode of inclined weak interlayer slope is the performance of the sliding mode along the weak interlayer in the upper part of the inclined interlayer.The failure mode of the two soft interlayer slope is inclined to the horizontal slope.The failure mode of the slope is a block sliding,and the soil between the inclined soft layer and the horizontal layer is in the sliding mode.(2)After excavation,the stability of slope is obviously reduced and the stress state of the whole slope is readjusted.If the slope failures,the "pull and cut" mode should be main failure mode.(3)The upper part of the slide pile excavation had to free face bending deformation,while the lower part of the pile is basically no deformation showed good anchor-shaped,passive earth pressure before the pile was a "D" shaped distribution,after the pile active earth pressure presents "R" shape distribution,passive earth pressure in front of the pile,mainly in the following parts of the anchor end of the distribution,and the passive earth pressure value is much larger than the value of active earth pressure after the pile;the presence of anti-slide pile,to a certain extent on play to prevent the slide down the slope deformation,for slope stability has improved.(4)An appropriate increase in the depth of rock-socketed is possible to improve the role of fixed slope on the pile,and can also effectively improve the stability of the slope,and can effectively limit the horizontal displacement of the slide pile.When the embedded depth of anti slide pile is increased to a certain depth,the change of the displacement and safety factor of anti slide pile is no longer obvious,For this engineering example,10 m is the most economical and reasonable embedded depth.With anti slide pile stiffness increases,anti slide pile to resist shear force and bending moment increase,the horizontal displacement of the top of the anti slide pile is gradually reduced and safety factor of slope increases gradually.But with the increase of bending stiffness to a certain degree,the upper slope of the slope reaches the yield failure,and the influence of the anti slide pile on the safety factor of the slope is no longer obvious.