Abstract: In the landslide control and slope protection project, the circular cross-section anti-sliding pile has been widely used in geotechnical engineering practice because of its advantages of mechanized pile construction. However, compared with the traditional rectangular cross-section anti-sliding pile, there is less research on the circular cross-section anti-sliding pile, and the design and theoretical systems are not perfect enough. There is no unified conclusion on anti-sliding effect yet. In this study, the model experiments were conduct to investigate the force and deformation characteristics of circular section and rectangular section anti-slide piles, comparing their anti-slide abilities. On the premise of satisfying the similarity relation of each test, the pile-free push test, circular section anti-sliding piles test and rectangular section anti-sliding piles test were carried out respectively to observe the whole process of the deformation of soil and model piles. The experimental results were compared. Eearth pressure cells, reinforcement stress gauges, and dial indicators were arranged to monitor the earth pressure, reinforcement stress and displacement of pile top. The mechanical characteristics of the model pile were analyzed. The performance of circular cross-section anti-sliding piles is basically the same as that of rectangular cross-section anti-sliding piles under the same conditions. The force transfer is uniform in the process of loading, the requirement for the strength of the fixed end of the pile is low, and the anti-sliding bearing capacity is good. It is worth popularizing and applying in engineering practice.

Key words: anti-slide pile, circular section, model test