Comparative Study On The Mechanical Characteristics Of Anti-slide Piles With Rectangular And Circular Cross-sections

With the increase of large-scale landslide treatment projects and the adeptness of mechanized construction,circular cross-section anti-slide piles are favored due to their high hole-forming efficiency,small disturbance,short construction period,and high safety.However,compared with the rectangular cross-section anti-slide piles,there are still a series of problems in its application;in view of the simple and practical conversion of rectangular anti-slide piles into circular anti-slide piles,this paper regards different cross-sections as dependent variables and studies two cross-sections.The cross-sectional form of the anti-slide pile changes with the internal force,bending moment and other mechanical characteristics.It is verified by model test of double-row anti-slide piles with rectangular cross-section and numerical simulation of double-row anti-slide piles with equivalent circular cross-section;through calculation of reinforcement,the cross-section transformation law of rectangular and circular cross-sections in actual engineering is studied,and engineering examples are combined.verification.The main research contents of this paper are as follows:（1）Based on the calculation theory of anti-slide pile internal force and beam bending strain energy theory,the equivalent conversion formula of rectangular and circular cross-section anti-slide piles is constructed.（2）Through a variety of reinforcement methods,the reinforcement calculation is carried out for the rectangular and circular cross-section anti-slide piles under the same bending moment,and the reinforcement method suitable for the circular cross-section anti-slide pile is optimized:according to the rectangle Reinforcement method and non-uniform（120°）reinforcement method;among them,the rectangular reinforcement method is more safe,and the non-uniform reinforcement method is more economical.（3）Through the calculation of the reinforcement,the rectangular cross-section dimensions commonly used in engineering practice are h₁×b₁=2.0×1.5m,h₂×b₂=2.5×2.0m,h₃×b₃=3.0×2.0m,the maximum that the anti-slide pile can bear Bending moment.Use the optimized circular section reinforcement method to calculate the reasonable section correction coefficient when the equivalent circular section anti-slide pile is subjected to the maximum bending moment.This paper recommends the circular section non-uniform distribution（120°）distribution The cross-section equivalent transformation formula modified by the rib method.In engineering practice,the section form and size can be reasonably selected according to the design bending moment value of the anti-slide pile.（4）According to the cross-section equivalent conversion formula constructed in this paper,the rectangular anti-slide piles in the model test were converted into circular anti-slide piles,and the equivalent circular double-row anti-slide piles were numerically simulated;the comparison results of the model test and the numerical simulation It shows that the displacement of the equivalent circular cross-section double-row anti-slide pile is slightly larger than that of the rectangular cross-section double-row anti-slide pile,and the pile body bending moment value is slightly smaller than that of the rectangular cross-section double-row anti-slide pile;the overall mechanical characteristics of the two cross-section anti-slide piles are similar,Verifying the rationality of the cross-section equivalent transformation formula.（5）Through engineering examples of circular anti-slide piles,the optimal reinforcement method for circular cross-section anti-slide piles is verified;the cross-section equivalent conversion correction formula recommended in this paper is verified.The results show that the modified cross-section equivalent transformation formula is reasonable.