[1]万志辉,戴国亮,龚维明,等.不同成桩工艺对后压浆灌注桩承载特性影响的试验研究[J].东南大学学报(自然科学版),2020,50(2):231-236.[doi:10.3969/j.issn.1001-0505.2020.02.004]
　Wan Zhihui,Dai Guoliang,Gong Weiming,et al.Experimental study on influence of different piling techniques on bearing characteristics of post-grouting bored piles[J].Journal of Southeast University (Natural Science Edition),2020,50(2):231-236.[doi:10.3969/j.issn.1001-0505.2020.02.004]
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不同成桩工艺对后压浆灌注桩承载特性影响的试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
50
期数:
2020年第2期
页码:
231-236
栏目:
土木工程
出版日期:
2020-03-20

文章信息/Info

Title:
Experimental study on influence of different piling techniques on bearing characteristics of post-grouting bored piles
作者:
万志辉; 戴国亮; 龚维明; 竺明星; 高鲁超
东南大学混凝土及预应力混凝土结构教育部重点实验室, 南京 211189; 东南大学土木工程学院, 南京 211189
Author(s):
Wan Zhihui;  Dai Guoliang;  Gong Weiming;  Zhu Mingxing;  Gao Luchao
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 211189, China
School of Civil Engineering, Southeast University, Nanjing 211189, China
关键词:
桩基工程;  灌注桩;  成桩工艺;  组合后压浆;  侧摩阻力;  端阻力
Keywords:
pile foundations;  bored piles;  piling technology;  combined post-grouting;  side friction;  base resistance
分类号:
TU473
DOI:
10.3969/j.issn.1001-0505.2020.02.004
摘要:
为研究不同成桩工艺对后压浆灌注桩承载特性的影响,基于石首长江公路大桥工程开展了1根回旋钻孔灌注桩和1根旋挖钻孔灌注桩的压浆前、后静载试验,对比分析了未压浆灌注桩与后压浆灌注桩的承载变形性能,探讨了后压浆对不同成桩工艺的灌注桩侧摩阻力和端阻力增强作用效果的影响,进而揭示了不同荷载水平下不同成桩工艺的后压浆灌注桩受力性状的差异.结果表明,组合后压浆能显著提升不同成桩工艺的灌注桩承载变形性能,且后压浆回旋钻孔灌注桩表现出的承载特性要优于后压浆旋挖钻孔灌注桩;不同成桩工艺不仅会影响后压浆灌注桩侧摩阻力与端阻力发挥特性,还会对灌注桩压浆过程中的浆液压力和压浆水泥用量造成影响,致使后压浆的加固作用效果不同,不同成桩工艺的后压浆灌注桩表现出不同的承载特性.
Abstract:
To study the influence of different piling techniques on the bearing characteristics of post-grouting piles, the bearing and deformation performance of ungrouting and post-grouting piles was analyzed based on the static load tests of one rotary drilling bored pile and one auger drilling bored pile before and after grouting by Shishou Yangtze River Highway Bridge. The influence of post-grouting on the enhancement of the side friction and the base resistance of bored piles with different piling techniques was discussed. The differences of the mechanical behaviors of post-grouting bored piles with different piling techniques under different loading levels were revealed. The results show that the combined post-grouting can significantly improve the bearing and deformation performance of bored piles with different piling techniques, and the bearing characteristics of post-grouting bored piles with the rotary drilling method are better than those of post-grouting bored piles with the auger drilling method. Different piling techniques not only affect the mobilization characteristics of the side friction and the base resistance of post-grouting bored piles, but also influence the grout pressure and the quantity of cement in the grouting process, resulting in different reinforcement effects of post-grouting. Therefore, post-grouting bored piles with different piling techniques exhibit different bearing characteristics.

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备注/Memo

备注/Memo:
收稿日期: 2019-08-19.
作者简介: 万志辉(1990—),男,博士,助理研究员,zhihuiwan@seu.edu.cn.
基金项目: 国家重点研发计划专项资助项目(2017YFC0703408)、国家自然科学基金资助项目(51678145, 51878160)、江苏省“六大人才高峰”资助项目(XNY-047).
引用本文: 万志辉,戴国亮,龚维明,等.不同成桩工艺对后压浆灌注桩承载特性影响的试验研究[J].东南大学学报(自然科学版),2020,50(2):231-236. DOI:10.3969/j.issn.1001-0505.2020.02.004.
更新日期/Last Update: 2020-03-20