The Analysis Of Super-long Pile Calculation Methods And Mechanical Properties

In recent years, with the development of the society and frequent human activities,landslide disasters happen frequently. Slide-resistant pile is widely used in landslide controlas one of the effective supporting measures. The application of slide-resistant pile in practicalengineering is far beyond its theoretical research. In many real projects the length of the pileis over30-40meters, which belongs to the category of super-long pile. Therefore it hasimportant practical meaning for the study of super anti slide pile.First of all, according to a great deal of relevant literature, this paper summarizes thecalculation method of landslide thrust impacting on anti-slide pile and of anti-slide pileinternal force, and analyzes the appropriate landslide thrust calculation method in differentlandslide forms and their scope of application and relative merits and faults. According to thecharacteristic of the actual engineering Da-ping landslide group double surface, this paperintroduces calculation method of landslide thrust double surface based on the transfercoefficient method and analyzes the existing calculation method of slide-resistant pile. It alsosummarizes the problems and shortcomings of current computing theory about slide-resistantpile. Furthermore, it proposes the research trends on slide-resistant pile and developmentdirection of anti-slide piles.Secondly, this paper is based on the above theoretical calculation method ofslide-resistant pile and the calculation method of landslide thrust, the Three Gorges ReservoirDa-ping landslide group. The paper uses geotechnical engineering analysis software Lizhengto calculate and analyze the thrust of this landslide. Super-long anti-slide piles are performednumerical analysis by the foundation coefficient method of the "m-k" method in the landslidegovernance. And on this basis, the paper conducts a brief introduction to the landslidestability analysis method, and gives an account of the strength reduction FEM method appliedin the landslide stability analysis in detail, mainly introducing the definition of the safe factorof the strength reduction FEM, and the selection of yield criterion and the finite elementstrength subtraction of the determination of side slope instability criterion.Finally, according to the characteristics of double sliding surface of Da-ping landslide,the paper uses large-scale finite element analysis software Midas-GTS to establish analysismodel which respectively considering shallow sliding surface and double surfaces landslidetwo-dimensional stability. Through the use of the strength reduction FEM to analyze the sideslope stability, the analysis shows that the landslide is in unstable condition which needs totake measures to be governed. As the above analysis combined with practical engineering,adopting anti-slide pile to reinforcement of the landslide and considering the interaction of thepile and soil relationship, the paper sets up three-dimensional finite element analysis model. Using the three dimensional elastic-plastic finite element strength reduction of slopereinforcement of the slope stability, the internal force and deformation of anti-slide pile areanalyzed.