Abstract
Centrifuge model tests were conducted on pile-reinforced and unreinforced cohesive soil slopes to investigate the fundamental behavior and reinforcement mechanism. A finite element analysis model was established and confirmed to be effective in capturing the primary behavior of pile-reinforced slopes by comparing its predictions with experimental results. Thus, a comprehensive understanding of the stress-deformation response was obtained by combining the numerical and physical simulations. The response of pile-reinforced slope was indicated to be significantly affected by pile spacing, pile location, restriction style of pile end, and inclination of slope. The piles have a significant effect on the behavior of reinforced slope, and the influencing area was described using a continuous surface, denoted asW-surface. The reinforcement mechanism was described using two basic concepts,compression effectandshear effect, respectively, referring to the piles increasing the compression strain and decreasing the shear strain of the slope in comparison with the unreinforced slope. The pile-soil interaction induces significantcompression effectin the inner zone near the piles; this effect is transferred to the upper part of the slope, with theshear effectbecoming prominent to prevent possible sliding of unreinforced slope.
Highlights
Landslides are one of the severest geologic hazards around the world, the prevention of which is of great interest to engineers and researchers
The pile-soil interaction induces significant compression effect in the inner zone near the piles; this effect is transferred to the upper part of the slope, with the shear effect becoming prominent to prevent possible sliding of unreinforced slope
The objective of this paper is to conduct such an attempt for the purpose of reinforcement mechanism analysis of pile-reinforced slope, including (1) to conduct centrifuge model tests of a cohesive soil slope using stabilizing piles, in comparison with the unreinforced slope; (2) to present a numerical scheme of the pile-reinforced slope and to confirm its effectiveness by simulating the centrifuge tests; (3) to analyze the behavior of the reinforced slope by using the test observations and numerical analysis; (4) to describe the reinforcement mechanism; and (5) to discuss the main factors that influence the behavior of reinforced slopes
Summary
Landslides are one of the severest geologic hazards around the world, the prevention of which is of great interest to engineers and researchers. The behavior of pile-reinforced slope can be investigated by using a diverse range of research approaches, which can be generally divided into three categories: field observations, model tests, and numerical analyses. Model tests offer a powerful approach to investigate the behavior and failure mechanism of a reinforced slope by efficiently considering various factors. The objective of this paper is to conduct such an attempt for the purpose of reinforcement mechanism analysis of pile-reinforced slope, including (1) to conduct centrifuge model tests of a cohesive soil slope using stabilizing piles, in comparison with the unreinforced slope; (2) to present a numerical scheme of the pile-reinforced slope and to confirm its effectiveness by simulating the centrifuge tests; (3) to analyze the behavior of the reinforced slope by using the test observations and numerical analysis; (4) to describe the reinforcement mechanism; and (5) to discuss the main factors that influence the behavior of reinforced slopes
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