为了研究后注浆对植入桩承载性能的影响,开展多组不同位置后注浆的植入桩模型试验及数值模拟分析,对比计算桩身轴力、侧摩阻力及桩承载力。结果表明:植入桩后注浆过程对桩周土体有明显挤压作用,使桩侧土压力增加;后注浆改变了植入桩侧摩阻力分布规律,提升了桩土相互作用;后注浆使桩身轴力减小、桩侧摩阻力增加,注浆位置的侧摩阻力增幅约10 kPa;相较于未注浆桩,模型试验得到不同位置后注浆桩承载力分别提高15.8%、28.1%和36.8%,数值模拟得到桩承载力提高分别为16.1%、28.7%和41.3%,均证明桩侧后注浆技术可显著提高桩承载力。研究成果可为新型植入桩技术研发提供参考。
In order to study the influence of post-grouting on the bearing performance of implanted piles, model tests and numerical simulation analysis of implanted piles with multiple groups of post-grouting at different positions were carried out, and the axial force, lateral friction resistance and bearing capacity of the pile were compared and calculated. The results show that: The grouting process has a significant extrusion effect on the soil around the pile after implantation, which increases the soil pressure on the pile side. Post-grouting changed the friction resistance distribution law of the implanted pile and improved the pile-soil interaction. The axial force of the pile body is reduced, and the lateral friction resistance of the pile is increased by about 10 kPa after grouting is increased. Compared with the non-grouting pile, the bearing capacity of the grouting pile is increased by 15.8%, 28.1% and 36.8% respectively in different positions, and the bearing capacity of the pile is increased by 16.1%, 28.7% and 41.3% respectively in numerical simulation, which proves that the post-grouting technology on the pile side can significantly improve the bearing capacity of the pile. The research results provide a reference for the research and development of new implantable pile technology.
[1] 张忠苗.灌注桩后注浆技术及工程应用[M].北京:中国建筑工业出版社,2009.
[2] 林志豪,陈宏湛,陈仁伟,等.滨海软基后注浆灌注桩承载性状现场试验研究[J].地下空间与工程学报,2022,18(增2):578-586.
[3] 周亚龙,王旭,张延杰,等.灌注桩基础桩底复合式后注浆及承载特性研究[J].岩土工程学报,2022,44(10):1864-1872.
[4] 刘开富,方鹏飞,刘雪梅,等.软土地区桩端后注浆灌注桩竖向承载性能试验研究[J].岩土工程学报,2013,35(增2):1054-1057.
[5] 王忠福,刘汉东,何思明,等.后注浆超长灌注桩竖向承载特性载荷试验研究[J].地下空间与工程学报,2013,9(2):253-257,262.
[6] 邓晓.后注浆钻孔灌注桩单桩承载力试验例析[J].建筑,2013(9):63-64.
[7] 张世民,王虹波,张四凤,等.后压浆桩抗压与抗拔现场对比试验[J].长江科学院院报,2018,35(3):135-138,143.
[8] 李洪江,童立元,刘松玉,等.后注浆超长灌注桩水平承载特性现场试验研究[J].建筑结构学报,2016,37(6):204-211.
[9] 赵春风,刘鹏伟,赵程,等.黏性土中桩侧后注浆单桩抗压承载性能室内模型试验研究[J].土木与环境工程学报(中英文),2024,46(4):23-28.
[10] 赵春风,吴悦,赵程,等.黏土中桩端后注浆单桩抗压承载特性室内模型试验研究[J].天津大学学报(自然科学与工程技术版),2019,52(12):1235-1244.
[11] 张日红,吴磊磊,孔清华.静钻根植桩基础研究与实践[J].岩土工程学报,2013,35(增2):1200-1203.
[12] 周佳锦,马俊杰,俞建霖,等.静钻根植桩施工环境效应现场试验研究[J].土木工程学报,2024,57(3):93-101.
[13] 方伟定,龚健,余智恩,等.静钻根植桩的设计、施工与试验研究[J].武汉大学学报(工学版),2013,46(增1):205-209.
[14] 赵宇,张浩,江磊,等.桩板式路基引扩孔灌浆后植入桩的承载特性[J].公路交通科技,2024,41(6):56-64.
[15] 王卫东,凌造,吴江斌,等.上海地区静钻根植桩承载特性现场试验研究[J].建筑结构学报,2019,40(2):238-245.
[16] 周佳锦,马俊杰,俞建霖,等.静钻根植桩竖向承载性能现场试验研究[J].岩土工程学报,2024,46(3):640-647.
[17] 龚晓南,罗子昂,周佳锦,等.软土地区静钻根植桩抗压承载力计算方法研究[J].岩土工程学报,2025,47(9):1783-1792.
[18] 邓岳保,俞杉,李欣然,等.植入桩后注浆方法[P].中国专利:CN202410294946.7,2024-06-04.
[19] 中华人民共和国住房和城乡建设部.建筑桩基检测技术规范(JGJ106 -2014)[S].北京:中国建筑工业出版社,2014.
[20] 中华人民共和国住房和城乡建设部.建筑地基基础设计规范(GB 50007-2011)[M].北京:中国建筑工业出版社,2014.
