The numerical analysis method is an important method to study the stability of the slope reinforced with anti-slide pile

which can take both the mechanical behavior of the anti-slide pile and the stability of the slope into consideration at the same time. However

in the previous numerical simulation

it is hard to find a numerical model of the anti-slide pile with easy modeling

high precision and low time cost. Therefore

an anti-slide pile model coupled with the composite solid-structural element is proposed in this study. Based on this model

the influence of design parameters such as pile location and space on the stability of slope reinforced by composite anti-slide pile are studied under the free and fixed constraints of anti-slide pile top. Besides

the potential failure modes of anti-slide pile is also studied. The results show that the proposed model can realistically simulate the mechanical properties of the pile with a high calculation accuracy

and the calculation results are independent on the mesh density. When the anti-slide pile is arranged in the middle of the slope

the safety factor of the reinforced slope reaches to a maximum value. The closer to both ends of the slope

the smaller the safety factor of the reinforced slope. When the pile space is less than 3D

the potential sliding surface of the slope is divided into two independent parts

and the soil between the piles forms an obvious stress arch. When the pile space is larger than 4D

the plastic shear zone of the center soil between the piles completely penetrates

and the soil between the piles forms the reverse stress arch. When the anti-sliding piles are arranged in the middle ( 0.5) and in the lower part of the slope ( 0.3) with the free and fixed constraints in pile top

respectively

the anti-sliding pile is easy to bend and damage. The results have guiding significance for the engineering design of slope reinforced with anti-slide pile.