Research On Reseaonable Layout Method For One-Row Stabilizing Pile In Landslide Control

Stabilizing pile is one of the major engineering measures in the treatment of landslide. The basic form of stabilizing pile in China is straight-line-shape single row pile. In recent years the stabilizing pile also derives some new forms. But in view of the specific landslide, what kind of layout method is more economical and reasonable, there is rarely reported about the research. Based on summarizing the basic analysis theory of landslides and stabilizing pile, the thesis employs theoretical analysis and numerical simulation as the main means of research, analyzing the interaction mechanism between stabilizing pile and slide mass and discussing the stabilizing pile spacing, cross-sectional size and length of pile influence on stabilizing pile internal force distribution. Furthermore, it studies the economic rationality of three typical pile layouts and then optimizes the pile design parameters. Main research content is as follows:Firstly, this article summarizes and analyzes the conditions for the existence of the soil arching effect. The formation mechanism of soil arching effect is explored by FLAC3D numerical simulation. And then the influence of same main effect factors on arching effect is revealed specifically, such as landslide thrust, pile spacing, sliding physical properties (including cohesion, angle of internal friction and elastic modulus), the pile-soil interface traits and layout of pile (including straight-line-shape layout, glyph layout and arch layout).Secondly, relying on the landslide instance of Guanyuan-Bazhong expressway in Sichuan, using elastic-plastic three-dimensional numerical simulation method, straight-line-shape layout piles, glyph layout piles and arch layout piles are used for numerical calculation respectively. The thesis analyzes the influence of pile spacing, section size and anchorage depth on the maximum internal force of anti-slide pile. What is more, reasonable design parameters is selected among the various layout methods, on this basis of which reinforcement for Stabilizing pile is designed and the engineering cost in the form of three kinds of layout is calculated. After comparative analysis, it concludes that the most economical and reasonable layout method is straight-line-shape form.Thirdly, after comparative analysis, the layout method selected in the research is to be further optimized, including the pile spacing optimizing, section size optimizing and pile length optimizing. And then it analyzes the rationality of all sorts of optimization methods. Ultimately, the most economical and reasonable design scheme is obtained.The thesis, based on the arching effect analysis of three typical layout that including straight-line-shape layout, glyph layout and arch layout, relying on a landslide instance, employs elastic-plastic three-dimensional numerical simulation method, analyzing the characteristics of stress on the stabilizing pile which is using three kinds of layout methods. What is more, it determines the relative optimal design scheme by comprehensive comparison. It can provide theoretical guidance and reference for the similar project which using stabilizing pile to treat landslide.