Experimental Study on the Uplift Bearing Mechanism of New Pneumatic Pipe Piles
Huan Wang, Rui Zhang, Zhengnan Liu, Xiang Wang, Xiwei Zhang
TL;DR
A new micropile with a pneumatic device and anchorage components significantly improves uplift resistance in soil slope reinforcement.
Contribution
A novel micropile design with a pneumatic device and anchorage components is introduced to enhance uplift resistance.
Findings
The new micropile increased ultimate uplift capacity by 161.7% compared to conventional micropiles.
Anchorage components without grouting provided 70.7% of the uplift capacity of conventional micropiles.
Each additional meter of anchorage length increased uplift capacity by 10.9% to 16.0% with minimal cost increase.
Abstract
To enhance the uplift resistance of micropiles used in soil slope reinforcement and ensure the stability and safety of slope structures, a novel micropile incorporating a small-scale pneumatic device and anchorage components was developed, and its uplift performance was evaluated. Through field uplift tests, the uplift load–vertical displacement relationship of the new micropile and conventional micropile in silty clay strata was compared. Numerical simulations were also conducted to reveal the uplift mechanism and analyze the influence of an anchorage component layout on the micropile’s uplift resistance. The field tests showed that the ultimate uplift capacity of a 3 m long novel micropile increased by 161.7% compared to that of a conventional micropile, with a 14.7% reduction in displacement. When the anchorage components were deployed without grouting, the novel micropile achieved…
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Taxonomy
TopicsGeotechnical Engineering and Underground Structures · Landslides and related hazards · Geotechnical Engineering and Analysis