土木与环境工程学报（中英文）2024，Vol.46Issue(4)：23-28,6.DOI:10.11835/j.issn.2096-6717.2022.015
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
Model test for single pile compressive bearing behavior with pile side post-grouting in clay
摘要
Abstract
The post-grouting technique can effectively improve the soil performance against disturbance and break the mud crust around the bored pile.Most of the researches on post-grouting focused on pile tip,while the pile side grouting is rarely involved,which affects its further application.To study the influence of pile side grouting volume on the compressive load behavior,an model test was carried out on the basis of the post-grouting technique of the field pile test.The test results show that,when the load is at a high level,the bearing capacity of the pile with 2 L and 3 L grouting volumes are 18.2% and 66.0% greater than that of the pile with volumes of 1 L,respectively.The increased rate is positively correlated with grouting volume,and the settlement of pile top can be greatly reduced.The axial force of the post-grouting pile decreases rapidly near the position of grouting,and the axial force near the tip of post-grouting pile is relatively low in the whole loading process.The post-grouting pile demonstrates the characteristics of the friction piles.The cement grout diffuses upward and downward from the grouting position,and the diffusion heights are both about 14 times the pile diameter for this model test.The pile side resistance of the post-grouting pile increases significantly in the range of the grout diffusion stage,and the increasing trend is more obvious the closer to the grouting point.关键词
钻孔灌注桩/承载力/后注浆/注浆量/浆液扩散高度Key words
bored pile/bearing capacity/post-grouting/grouting volume/grouting diffusion height分类
建筑与水利引用本文复制引用
赵春风,刘鹏伟,赵程,张家奇..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):23-28,6.基金项目
国家自然科学基金(41672265) National Natural Science Foundation of China(No.41672265) （41672265）
