CENTRIFUGE MODEL TEST AND FINITE ELEMENT ANALYSIS ON L-PILE REINFORCED SLOPE

In this paper, a combination of centrifugal model tests and numerical simulations is used to study the deformation characteristics of L-pile-reinforced slopes and the interaction between piles and soil. Based on the centrifugal model test, the displacement field of the L-pile-reinforced slope under 50g gravity acceleration is obtained, and the centrifugal model test process is simulated using a finite element method. The numerical values agree well with the load-displacement curve of the slope obtained from the test results. Compared with the results of numerical simulation, it is found that the reinforcement effect of L-piles is obviously better than that of conventional piles. The displacement of the slope is reduced by about 25%, and the rotation angle is reduced by about 70%. The soil pressure distribution on the upper and lower sides of the surface horizontal section of the L-pile was quite different due to the horizontal section and vertical section, with the maximum difference of about 150 kPa. There is a minimum value of friction, about 10 kPa, between the horizontal section and the L-pile-reinforced slope. There is a peak value of displacement distribution inside the vertical section. Through the analysis of stress and deformation of the slope through various methods, it is verified that soil arching effect occurred on the slope under the action of the pile. The horizontal section of the L-pile further intensifies the soil arching effect and improves the stability of the L-pile.