An Analytical Model of the Force Distribution Characteristics on an h-Shaped Combined Circular Pile Under the Sliding Force of Landslide

In landslide treatment, h-shaped combined circular piles are widely used, and the bending deformation of the piles under the action of sliding force has been deeply studied. However, most previous studies have not considered the difference in the force distribution on the front and rear sides of the pile body. This study established a modified analysis model that takes this difference into account, and through model tests, we calculated and verified the force distribution characteristics of single-row circular piles and h-shaped combined circular piles under various sliding forces. The results show that the proposed modified model can accurately predict the force distribution characteristics on the pile bodies of single-row circular piles and h-shaped combined circular piles, and the calculated values are more consistent with the model test data compared to the results of existing theoretical models. The overall structure of the h-shaped combined circular piles leads to more reasonable force distribution on the pile body than that of the single-row circular piles, resulting in reductions of approximately 20% in soil pressure, 10% in the bending moment of the pile body, and 20% in the pile top displacement. Therefore, the h-shaped combined circular piles are more effective in resisting sliding forces in the model tunnels and provide better protection. Under the same load, the bending moment, soil pressure, and final displacement of the model tunnels of h-shaped combined piles are significantly smaller than those of single-row circular piles. In summary, the proposed modified model provides a reference basis for the internal force verification in the design of h-shaped combined circular piles in actual engineering projects.