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带扩大桩靴桩侧同步灌浆预制桩承载力试验研究
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Experimental Study on Bearing Capacity of Precast Piles with Enlarged Pile Toes and Pile Side Synchronous Grouting
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    摘要:

    为了满足当前社会对于桩基础日益增长的低成本、高强度的需求,提出了一种新桩型——带扩大桩靴桩侧同步灌浆预制桩基础. 该新桩型具有低耗高效的优势,一方面该桩型施工步骤简便,施工设备常规,便于工程推广应用;另一方面底部扩大桩靴增加了桩的有效直径,提高了桩端承载力,同时水泥浆液渗入周围土体中,可改善桩土接触面特性,进而提高桩侧摩阻力. 为进一步探明带扩大桩靴桩侧同步灌浆预制桩基础的承载特性,本文开展室内模型试验进行研究. 试验结果表明,带扩大桩靴桩侧同步灌浆模型桩在桩顶受压时,桩基承载力明显高于等截面常规桩,而且桩侧水泥浆液凝固后,其承载力将进一步提升. 本研究揭示了新桩型的承载机理,显示了新桩型承载能力的优越性. 相关研究结果可以为新桩型工程实践提供理论支撑.

    Abstract:

    To meet society’s increasing demand for low-cost and high-strength pile foundations, this paper proposes a new type of pile, a precast pile foundation with enlarged pile toes and synchronous grouting on the side of piles. The new pile type has the advantages of low energy consumption and high efficiency. On the one hand, it has easy construction steps and conventional construction equipment, which is convenient for engineering popularization and application. On the other hand, enlarged pile toes increase the effective diameter of the piles and thus improve the bearing capacity of pile end. Meanwhile, the cement slurry infiltrates into the surrounding soil, which can improve the characteristics of the pile soil contact surface, thereby increasing the pile side friction. To further prove the load-bearing characteristics of the synchronously grouted precast pile foundation with enlarged plie toes, an indoor model test is carried out in this paper. The test results show that the bearing capacity of the synchronous grouting model pile with enlarged pile toe is higher than that of the conventional pile with equal cross-section when the pile top is compressed, and its bearing capacity is further improved due to the existence of cement slurry on the pile side. The test results reveal the bearing mechanism of the new pile type and show the superiority of the new pile type’s bearing capacity. The results of this research can provide theoretical support for new pile-type engineering practices.

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王奎华 ,耿少寒 ,许应豪 ,吴君涛 ?,邱尚印 ,黄山 .带扩大桩靴桩侧同步灌浆预制桩承载力试验研究[J].湖南大学学报:自然科学版,2025,52(5):79~87

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  • 在线发布日期: 2025-06-09
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