Rock-socketed Depth Of The Stabilizing Pile For Landslides Impacted By Water In Three Gorges Reservoir Area

This article combined the calculating theory with numerical simulation,TakingGongGiafang landslide of anti-slide pile management project for example in three gorgesreservoir area,calculated the stability of the landslide and landslide thrust on anti-slidepile under different load conditions,analyzed the lateral allowable bearing capacity,intensity and deformation parameters of rock mass around the pile.Built a pile-rock andsoil model.Researched the rock-socketed segment of the pile and the stress anddeformation law of rock mass around the pile under different thrust distributions,and thenput forward a reasonable socketed depth.The following research contents and results areincluded:(1)Introduced the commonly used calculation method of landslide thrust and thestability of landslide,that is the limit equilibrium method and the finite element strengthreduction method,and the pile-rock contact analysis method.Several kinds of internalforce calculation theoretical model and the basic assumptions about the rock-socketedsegment of anti-slide pile are given.(2)Using the RMR and GSI surrounding rock classification system and Hoek-Brown strength criterion to estimate the horizontal allowable bearing capacity and thestrength and deformation parameters of the rock mass around the rock-socketed segmentof the anti-slide pile.It reflected the nonlinear failure characteristics of the rock moreaccurately and much better. Meanwhile, Analyzed the horizontal allowable bearingcapacity of the rock mass around the rock-socketed segment of the anti-slide pile,and therelationship of physical and mechanical properties of rock mass and the influence ofwater-level fluctuation.This analyze data were the basis of the numerical simulation,using which to analyze the calculation model about the rock-socketed depth of anti-slidepile.(3)Based on field geological survey and exploration data,Built the anti-slidepile-slope-reservoir water level coupling geologic model by considering the changingwater level caused by water level fluctuation.Using the Slope\Seep\Sigma modules in Geostudio software to analyze the landslide thrust,the changing rule of slope stress andstrain and the stability coefficient of the reinforced slope and unreinforced slope byconsidering the influence of water on slope.In Ansys,performing the non-linear contactanalysis and elastic-plastic analysis around the pile,and the rock-socketed depth optimaldesign by considering the geological environment and geological structure.(4)Basing on elastic and plastic calculation of anti-slide pile about the rock-socketeddepth,rock and soil physical Parameters around the socketed section of pile,and thenumerical simulation of rock-socketed effect to analyze the factors and rules that affectedthe rock-socketed depth design of the anti-slide pile,and then explain systematicallymechanism about the rock-socketed effect of anti-slide pile.The research results are theexplanation and supplement of the classical theory of anti-slide pile design,and providethe theoretical foundation for further optimization of anti-slide pile design.