Abstract
This study explores the pile-soil interaction mechanism and the optimal use of antislide piles for slope reinforcement based on finite difference numerical modelling. The force and displacement principles of slopes and antislide piles are analysed. The influences of various factors are investigated, such as postpile filling parameters, pile embedding methods, and pile cross-sectional shapes. Numerical modelling is used to determine the optimal layouts of antislide piles for push and traction landslides. The findings indicate that the cohesive force of the fill has a greater influence on the piles and slope than the friction angle and is the primary control factor. Fully buried antislide piles provide a better antisliding effect than semiburied ones. With fully buried piles, the best controlling effect is obtained when the ratio of the length of the pile’s free section to the height of the sliding body is approximately 4/5. Moreover, stepped-cross-section piles provide better slope reinforcement than those with rectangular, T-shaped, or trapezoidal cross-sections. In practical applications, end-bearing arches can be utilized as the primary control structures, with friction arches used for secondary control to improve the soil arching effect as much as possible, thereby enhancing the stability of the piles and slope. To control landslides of various thrust forms, antislide piles should be set in the active section, the core sliding section, or both, as required. This paper provides guidance for improving the design of antislide piles.
Highlights
China has a vast territory with diverse geomorphological topographies and extensive mountainous areas
Further effective economic and engineering guidance is, needed. is paper uses the numerical simulation software FLAC3D to investigate the factors affecting the effectiveness of antislide piles and their responses to the main control parameters, which include the c and φ values of the filler behind the pile and the pile embedding method, crosssectional shape, and layout under two types of thrust. us, we reveal the mechanism of pile-soil interaction for the optimisation of slope reinforcement plans
We investigated the influences on the piles’ slope control ability, such as the c and φ values of the filler behind the piles, and pile embedding type and cross-sectional shape. e ideal pile positions for controlling sliding and traction landslides were determined and the primary findings are summarised as follows
Summary
China has a vast territory with diverse geomorphological topographies and extensive mountainous areas. Antislide piles have a strong antisliding ability and flexible positioning and are a targeted and cost-effective reinforcement method used in high, steep slope protection projects. To optimize their layout, there has been a considerable research on their influencing factors, such as pile spacing, soil properties, and anchor cable prestress parameters. Some factors influencing the control effect of antislide pile are studied in some paper: antislide piles reinforce the slope through soil arching effect, which depends on soil properties, pile-spacing-todiameter ratio, and relative movement between the soil and the pile [27, 28]. Further effective economic and engineering guidance is, needed. is paper uses the numerical simulation software FLAC3D to investigate the factors affecting the effectiveness of antislide piles and their responses to the main control parameters, which include the c and φ values of the filler behind the pile and the pile embedding method, crosssectional shape, and layout under two types of thrust. us, we reveal the mechanism of pile-soil interaction for the optimisation of slope reinforcement plans
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