意义意义管桩后注浆可有效改善桩-土接触界面物理力学性质,在提高管桩摩阻力、减少上部结构沉降等方面发挥着重要作用。进展进展通过对管桩后注浆工艺、后注浆理论、管桩注浆后的承载性能、管桩-注浆体-土接触界面剪切性能等进行综述,展望了管桩后注浆的发展方向。结果表明:(1)后注浆对提高中小直径管桩承载力有一定作用;注浆后,中掘法管桩的承载力一般超过了4000kN、静钻根植竹节桩的承载力可提升20%以上、随钻跟管桩承载力普遍超过20000kN。(2)现有的注浆理论推动了注浆技术的发展,虽然相关研究成果与工程实践存在差异,但可以给出浆液扩散的初步轮廓和扩散范围,为注浆设计和工程应用提供科学指导。(3)桩-浆-土接触界面的研究大多以剪切试验为载体,研究浆-土接触界面剪切性能这一宏观表象,很少涉及注浆液以注浆根系、爪牙和毛细爪牙的形式伸入土体并与土体进行关键离子交换从而提高桩-浆-土接触界面黏结强度的宏微观扩散本质。(4)现有注浆研究大多止步于注浆结果分析,较少涉及注浆机理,对浆液在地层中的流动扩散规律认识不够清晰。结论与展望结论与展望桩侧注浆液渐进性流动过程可视化分析、注浆体三维尺寸定量表征、管桩注浆过程智能化监测、新型管桩桩侧注浆工艺研发是未来管桩桩侧后注浆发展的重要方向。

Significance Post-grouting of pipe piles is an effective technique for improving the physical and mechanical properties of the pile-soil interface, playing a significant role in enhancing the frictional resis‑tance of pipe piles and reducing settlement of the superstructure. Progress This article reviews post-grouting technology, post-grouting theory, the bearing performance of pipe piles after grouting, and the shear perfor‑mance of the pile-slurry-soil interface. Furthermore, it explores the future development directions of post-grouting for pipe piles. (1) Post-grouting effectively improves the bearing capacity of small- and medium-diameter pipe piles. After grouting, the bearing capacity of pipe piles installed using the intermediate excava‑tion method generally exceeds 4 000 kN. Additionally, the bearing capacity of static drilling and planting bamboo joint piles increases by more than 20%, while the bearing capacity of drilling and pipe piles typi‑cally exceeds 20 000 kN. (2) Existing grouting theories have facilitated advancements in grouting technol‑ogy. While discrepancies exist between research findings and engineering practices, these theories provide a preliminary outline and range for slurry diffusion, offering scientific guidance for grouting design and en‑gineering applications. (3) Most studies on the pile-slurry-soil interface utilize shear tests to analyze macro‑scopic behavior, focusing on the shear performance of the pile-slurry-soil interface. However, few delve into the macro- and microscopic diffusion mechanisms of grouting fluid penetrating the soil in the form of grouting roots, claws, and capillary claws. Additionally, limited attention has been given to the ion ex‑change processes that enhance the bond strength of the pile-slurry-soil interface. (4) Current research pre‑dominantly focuses on analyzing grouting outcomes, with insufficient exploration of grouting mechanisms. Consequently, there remains a lack of clarity regarding the flow and diffusion behaviors of grout within the soil formation. Conclusions and prospects Visual analysis of the progressive flow of grouting fluid along the pile side, quantitative characterization of the three-dimensional geometry of the grouting body, intelligent monitoring of the grouting process, and the development of novel pipe pile side grouting techniques are es‑sential for advancing the future of pipe pile side post-grouting.