Method for calculating landslide thrusts behind double-row piles based on displacement control

In engineering practices, the transfer coefficient overload method in the limit state is generally used to obtain the landslide thrusts behind one-row piles, and then the landslide thrusts behind double-row piles are manually distributed, which is inconsistent with the actual bearing forces behind the front- and rear-row piles in the non-limit state. Based on the coordination of pile-soil deformation, considering the correlation between displacement and soil arching effects, combining with the Mohr's circular coordinate translation method and the inclined differential element method, a method for calculating the landslide thrusts behind double-row piles in non-limit state is established based on the vertical soil arching theory and the horizontal soil arching theory. Compared with the indoor centrifugal model test results, the theoretical and measured landslide thrusts behind the front-row piles compatible with the soil displacements of 7 mm and 21 mm are basically the same, and the error between the theoretical and measured landslide thrusts behind the rear-row piles are 1.08% and 6.42%, which shows the rationality and applicability of the proposed method to a certain extent. The proposed method may provide a theoretical basis for determining the landslide thrusts behind double-row piles compatible with any soil displacement.