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<p>Understanding the shear behavior of pile-rock interface is important for the design and analysis of rock-socketed piles widely employed in long-span bridges. This paper focuses on the often-neglected effect of the pile-forming process (i.e., mud interlayer, and self-weight stress of concrete slurry) on the shear behavior of pile-rock interfaces. The rough-surfaced field sandstone in Ma’anshan Yangtze River Bridge was employed to prepare the pile-rock interface sample with a novel sampling device, which can replicate the in-situ construction conditions of the pile-forming process. Then a series of interface shear tests were carried out to investigate the effect of the pile-forming process on the shear behavior of the pile-rock interface. The results show that: (1) the actual pile-rock interface exhibits both brittle shear failure for a rough interface and slip failure for a relatively smooth interface, instead of the simultaneous brittle failure for a regular interface; (2) the mud interlayer can reduce the cementation and frictional strength of the pile-rock interface, while the increasing self-weight stress of concrete slurry can enhance the cementation and frictional strength; (3) the interfacial compressive strength of the pile-rock interface increases by approximately 5.02 and 32.7&#xa0;MPa, and the interfacial cohesion increases by approximately 0.44 and 0.49&#xa0;MPa for mud-immersed and non-immersed samples respectively for each 40&#xa0;m depth under a concrete self-weights stress of 1.0&#xa0;MPa.</p>

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Shear Behavior of Pile-Rock Interfaces Considering Pile Formation in Deep Rock-Socketed Piles

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Banglu Xi,
  • Zhenhua Zhang,
  • Guojuan Xu,
  • Yonggao Yin,
  • Dan Zhang

摘要

Understanding the shear behavior of pile-rock interface is important for the design and analysis of rock-socketed piles widely employed in long-span bridges. This paper focuses on the often-neglected effect of the pile-forming process (i.e., mud interlayer, and self-weight stress of concrete slurry) on the shear behavior of pile-rock interfaces. The rough-surfaced field sandstone in Ma’anshan Yangtze River Bridge was employed to prepare the pile-rock interface sample with a novel sampling device, which can replicate the in-situ construction conditions of the pile-forming process. Then a series of interface shear tests were carried out to investigate the effect of the pile-forming process on the shear behavior of the pile-rock interface. The results show that: (1) the actual pile-rock interface exhibits both brittle shear failure for a rough interface and slip failure for a relatively smooth interface, instead of the simultaneous brittle failure for a regular interface; (2) the mud interlayer can reduce the cementation and frictional strength of the pile-rock interface, while the increasing self-weight stress of concrete slurry can enhance the cementation and frictional strength; (3) the interfacial compressive strength of the pile-rock interface increases by approximately 5.02 and 32.7 MPa, and the interfacial cohesion increases by approximately 0.44 and 0.49 MPa for mud-immersed and non-immersed samples respectively for each 40 m depth under a concrete self-weights stress of 1.0 MPa.