Internal force calculation of double row anti-slide pile structure based on finite difference method

To develop an efficient internal force calculation model for double row anti-slide piles with connecting beams, the finite difference method was used to calculate the internal force of all piles at the load section and embedded end of double row piles. The structure of double row anti-slide pile with connecting beam was simplified to two single piles disconnected at the zero bending moment of the connecting beam at the pile top; the bending moments and shear forces at the top of the front and back piles were obtained by superposition of the forces on the double row piles. The structural model tests were carried out to check the effectiveness of the calculation model based on the finite difference method. The results show that the model test results are consistent with the data of pile top displacement and pile body bending moment obtained from the calculation model, indicating that the simplified calculation model is effective. There is a slight deviation between the positions where the maximum bending moment calculation is for the rear pile. The calculated maximum bending moment position is close to the real pile failure position, further proving the reliability of the entire pile internal force calculation model based on the finite difference method. The finite difference calculation model avoids the complex calculation process of iterating the loaded and embedded sections using continuous conditions, and provides a fast and efficient method for calculating the internal forces of double row piles with connecting beams in practical engineering.