Interaction Between Anti-sliding Pile And Landslide And FEM Design Of Anti-slide Piles

Traditional landslide engineering design methods have many problems,and many links need to make assumptions,such as the assumption of the slip surface,the slide body is regarded as a rigid body to segment the soil,and the relationship between the various strips is assumed because of different analysis.The method is also different.Geotechnical bodies are complex nonlinear problems.Such assumptions are obviously unreasonable.Landslide thrust and resistance distribution forms also need to be assumed.For example,it is assumed that the distribution forms are triangles,rectangles,etc.,and rock and soil stress and pore water cannot be considered.The coupling effect cannot consider the interaction between anti-slide piles and landslides.As a result,the internal forces of the support structure obtained are either conservative,resulting in waste of engineering resources,or insecure,threatening people's lives and property safety.Therefore,this paper is To solve this series of problems,the principle of finite element analysis was mainly used to carry out research,which can provide reference and considerations for the design of landslide engineering.This paper uses the Rama Landslide of Meigu County as the research background.This landslide belongs to the front part of an oversized ancient landslide.The resurgent landslide is a complex large-scale deep landslide.The main research contents are as follows:(1)Based on the data of survey and design,field measurement and other data,this paper first analyzes the failure mechanism of landslides based on the geological conditions of landslides and the site deformation characteristics of landslide areas,and proposes a landslide geological model for the study area;(2)The landslide stability evaluation methods,limit equilibrium method,finite element limit equilibrium method,and finite element strength reduction method are discussed.Then,based on the unsaturated SEEPage theory and soil water characteristic curve theory,the software combination of SEEP/w and SIGMA software is analyzed.The landslide was subjected to infiltration analysis under rainstorm conditions.The results obtained from the previous coupling analysis were combined with SLOPE.Using the principle of finite element limit equilibrium,the sliding belt parameters were obtained by inversion and compared with the saturated residual fast shear test results.At the same time,the characteristics of the distribution of the pore water pressure under the condition of rainstorm infiltration are analyzed,and the changes of the stability coefficient of the landslide at different storms are analyzed,and the parameters of the sliding belt determined by the inversion method and the saturated fast shear residual test method are analyzed.Different methods were used to comprehensively evaluate the potential sliding surface of the landslide.Under the heavy rain conditions,the sliding surface 3 is the most unstable and is currently in a state of critical instability.It continues to develop upwards,forming a sliding surface 2,and finally forming a slippery slip.Face 1 Trend;(3)Discussed the traditional thrust and resistance calculation method and existing problems.Using the transfer coefficient method,the thrust and resistance of the landslide were calculated for the most unfavorable slip surface.Then the author used the rational software to resist the main retaining structure of the landslide.The sliding pile project was designed and its shear and bending moment diagrams were obtained;(4)The ABAQUS software was used to simulate the three-dimensional finite element numerical simulation.The interaction between the pile and the soil was studied.The stress,displacement field distribution of the landslide under three conditions including the initial state of the landslide,the excavation condition and the anti-sliding pile reinforcement were analyzed.The characteristics,the three working conditions all consider the coupling effect between the pore water pressure and stress,can well consider the pile-soil interaction,study the law of soil arching at the same time,prove the rationality of the pile arrangement,and correspond the on-site monitoring points to The deep displacement of the sliding body in the numerical simulation is compared with the deep displacement of the sliding body measured at this point,and the distribution curve is close.The design,numerical simulation and measured values of the pile top displacement are compared and analyzed,the results are close to each other;the anti-slide pile interacts with the landslide body.(5)Based on the study of the effects,the anti-slide piles were designed using the finite element strength reduction method and the stress obtained from the contact surface was integrated through ABAQUS post-processing to obtain the thrust,resistance and distribution of the landslide under the specified safety factor of the project.Form,and the bending moment,shear force size and distribution characteristics of the pile body,comparing the results with those obtained by the traditional unbalanced thrust method Analysis,proved the rationality of the finite element strength reduction method,through the landslide force measured data and numerical simulation of the distribution curve is basically the same,the results show that the actual landslide thrust is a parabolic distribution rather than the traditional method as assumed triangle distribution,through The results obtained from field tests using steel stress gauges are compared with those from numerical simulation.The results are basically the same.The finite element method can be used well in support structure design.This time the damage criterion follows the Mohr-Coulomb criterion,and the instability criterion For the abrupt change of displacement at the top of the landslide body,the landslide after treatment was evaluated by the finite element strength reduction method.The results showed that the landslide treatment met the specification 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