Abstract
Antislide piles have been proven to be an effective measure for slope reinforcement. However, straight piles, which are widely used as a traditional pile type, may be unsuitable in water-level variation zones. To solve this problem, a new pile structure, termed the L-pile, was proposed to improve the reinforcement effect on soil slopes under drawdown conditions. A series of drawdown centrifuge model tests were performed to analyze the deformation and failure behavior of L-pile-reinforced slopes. New findings show the new L-pile reinforcement effect and mechanism as well as the failure mechanism of L-pile-reinforced slopes under drawdown conditions. The test results show that L-piles increase the stability level and reduce the deformation of the slope more significantly than straight piles. The slip surface of the L-pile-reinforced slope is discontinuous and develops downward from the slope top during drawdown. The drawdown-induced slope deformation is limited within a region that is enlarged if using L-piles in place of straight piles. The horizontal segment of the L-pile has a significant influence on the pile‒soil interaction and causes an outside convex soil arch in the slope. The failure mechanism of L-pile-reinforced slopes involves significant coupling processes between deformation localization and local failure. The failure mechanism can be used to explain the variations in the slope failure behavior due to the change in pile type and layout. L-piles increase the reinforcement effect through a stronger delay in deformation localization than straight piles.
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The study is funded by Tsinghua University Initiative Scientific Research Program and National Natural Science Foundation of China (52039005).
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Liu, S., Zhang, G. & Luo, F. Centrifuge modeling of new pile reinforcement on slopes subjected to drawdown. Bull Eng Geol Environ 81, 396 (2022). https://doi.org/10.1007/s10064-022-02893-8
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DOI: https://doi.org/10.1007/s10064-022-02893-8