Abstract: Stabilizing pipe piles are small-diameter prestressed concrete elements that can be constructed rapidly. Double-row stabilizing pipe piles are increasingly used to reinforce small- to medium-scale landslides and engineering slopes; however, studies on their mechanical behavior remain limited. Based on a cut slope in expressway engineering, a scaled physical model test with the geometric and gravity similarity ratios of 1∶12 and 1∶1 respectively, has been conducted to investigate the mechanical behavior of double-row stabilizing pipe piles used to reinforce redbed slopes. Lateral loads were applied on the back side of the model slope to simulate different landslide thrusts. Slope displacements, earth pressures on the piles, pile strains, and deformation-field evolution (via particle image velocimetry) were monitored throughout the loading process to obtain the deformation and internal-force characteristics of the double-row piles as well as the deformation patterns and failure mechanisms of the reinforced slope. The results show that as the lateral thrust increases, the rear pile experiences successively the linear-elastic small deformation, elastic-plastic deformation, and plastic large deformation, while the front pile only experiences the first two stages with a deformation hysteresis effect. The bending moment on the front pile shows a parabolic distribution with the apex located in its middle and lower part, and exhibits a reverse bending mode with the front side of the pile tensioned within the half height of the loading segment from the pile top. Earth pressure on the two sides of the rear pile shows a parabolic distribution with small values near the upper and a slightly higher resistance on its front side than the thrust on its rear side. The maximum bending moment on the rear pile accounts for approximately 50% of that on the front pile. Under the condition that the lateral thrust is less than 70% of the limit load defined as the minimum thrust causing the pile to be in the serviceability limit state, the rear piles are favorable to improve the local stability of the upper slope. However, if the lateral thrust is greater than the limit load, a deep slip surface occurs in the slope, and the slide-resisting effect of the double-row piles focuses on the front piles other than the rear ones. Numerical simulations show good agreement with the physical model results. Overall, double-row stabilizing pipe piles are suitable for talus slopes with gentle slope rate (≤1∶1.5) and moderate heights (≤30 m), in which the rear piles restrain local deformation of the upper slopes and the front piles control the stability of the slopes, reflecting the reinforcement effect of major front piles combined with auxiliary rear piles. This study provides valuable insights into the mechanical behavior of the reinforced landslides and slopes with the double pipe piles, and offers a scientific basis for engineering design.