In order to analyze the deformation and stress Bridge Double characteristics of the pile foundation on the slope, this paper uses the finite element software Abaqus for numerical simulation. The Bridge Double displacement and stress data of pile under different working conditions (the combination of heap load and vertical load and horizontal load and inclined load) were collected; the distribution of pile displacement, axial force and bending moment were analyzed. Simulation results show that: slope top loading has little effect on vertical displacement; when the heap load exceeds 200 kPa, the horizontal displacement is greatly affected. Pile axial force decreases with pile burial depth; pile lateral resistance plays a more adequate role in the rock and soil layer. The bending moment of double pile foundation is positive at the top and negative at the bottom. Applied oblique load has obvious p-Δ effect.

With the rapid development of our country’s economy, roads and railways are extended to all parts of the country; in some mountainous and hilly areas, many bridge piles need to be located on steep slopes due to the terrain. Compared with the pile foundation on the flat ground, the pile foundation on the steep slope has certain particularity. In addition to bearing the load of the superstructure, it usually also bears the soil pressure from the slope. Therefore, it is of practical significance to study the deformation and stress of double pile foundation on the slope. Many experts and scholars at home and abroad have carried out in-depth research on the impact of vertical and horizontal loads on pile foundation. Zhao Minghua [1] adopted the finite element method to simulate the field tilting load test and the field negative friction test, and analyzed the stress characteristics of foundation pile under the combined action of tilting load and negative friction. Feng Zhongju [2] established a three-dimensional spatial model of bridge pile foundation in deep soft foundation area by theoretical analysis and numerical simulation, and analyzed the variation rules of vertical ultimate bearing capacity, pile tip resistance and pile lateral resistance of pile foundation under different working conditions. Zheng Gang [3] established a numerical model by using the limit analysis method of discontinuous layout optimization (DLO) to analyze the influence of slope geometry size, soil parameters and foundation position on the ultimate bearing capacity of slope strip foundation and slope failure mode. Chu Chengfu [4] adopted the “m” method to simulate pile-soil interaction, established the pile foundation control differential equation according to the force and torque balance conditions, established the second-order precision difference equation, and numerically simulated the displacement and internal force of the foundation pile. Luo Weihua [5] used finite element software Marc to analyze the influence of pile spacing change, pile stiffness change, rock-socketed depth change and rock-soil quality around pile on the stress and displacement of double-row piles of pile pier. Zhao Minghua [6] established an improved finite rod element method applied to the analysis of internal force displacement of pile foundation of bridge with high and steep slopes through the treatment of pile load and boundary conditions.

In summary, at present, there are many researches on the bearing characteristics of single pile, and most of them are on the pile foundation on the flat ground, and there are few researches on the deformation and stress of double pile foundation under steep slope. The numerical simulation method is used to study the deformation and stress characteristics of double pile foundation under the action of pile load and various loads on the high and steep slope.