圆形抗滑桩 -拱形挡土板支挡性能与参数分析

In order to circumvent the shortwmings of the current construction methods, develop safe, efficient and reliable construction methods. Taking a high-speed railway cutting slope project in Northeast China as an instance, a new type of arched retaining plate and pile wall support system is proposed in this paper. This is achieved by using circular antislip piles that are suitable for mechanical drilling to replace the current rectangular antislip piles and prefabricating arched retaining plates. A finite element model was constructed to analyze the effects of pile length, pile spacing, pile diameter, and the rise-span ratio of the arched retaining plate on the support performance of the new arched plate and pile wall support system. The results reveal the change rule in the horizontal displacement of the pile top and the internal force of the pile stem under different parameters. Furthermore, the pile length is positively correlated with the bending moment and shear force of the pile stem but is negatively correlated with the horizontal displacement of the pile top. When the pile length exceeds 14 m, its influence on the horizontal displacement of the pile top, the bending moment of the pile body, and the shear force is significantly weakened. At the same time, as the spacing between piles increases, the horizontal displacement of the pile top increases, but the amplitude of change gradually decreases. As the span ratio of the arched retaining plate increases, the horizontal displacement of the pile top, the bending moment of the pile stem, and the shear force all decrease. The factors affecting the retaining performance of the arched plate pile wall system include successive pile spacing, pile diameter, pile length, and rise-span ratio. The research results provide a new idea for the application of circular antislip piles and arched retaining plate support systems in the field of practical engineering.