建筑结构学报2018，Vol.39Issue(5)：164-173,10.DOI:10.14006/j.jzjgxb.2018.05.021
侧壁后注浆根式沉井竖向承载特性原位试验研究
In-situ test on vertical compressive bearing characteristic of rooted caisson with grouting at caisson side
摘要
Abstract
To improve the design method of rooted caisson and study the effect of grouting at caisson side on vertical bearing capacity of rooted caisson,the field vertical loading tests of caisson of Wangdong Yangtze River Highway Bridge were carried out. The rooted caisson and the rooted caisson with grouting at caisson side were also tested for comparative analysis. The results show that the axial force distribution of rooted caisson is stepped,which can be alleviated by grouting at caisson side. Due to the construction technology of expanding diameter of hole and backfilling pebbles,the shaft resistance of soil cannot develop completely. The shaft resistance of soil can be improved either by embedding roots in caisson or grouting at caisson side,which can reduce the harmful effect by the backfilling gravels technology. The vertical bearing capacity of caisson can be improved by 126％ and 77％ respectively by embedding roots in caisson and grouting at caisson side,and the ratio of end resistance to vertical bearing capacity of caisson can be decreased from 64.2％ to 42.1％.关键词
根式沉井/现场试验/竖向承载力/注浆/井侧摩阻力Key words
rooted caisson/field test/vertical bearing capacity/grouting/shaft resistance around caisson分类
建筑与水利引用本文复制引用
龚维明,杨超,戴国亮,殷永高..侧壁后注浆根式沉井竖向承载特性原位试验研究[J].建筑结构学报,2018,39(5):164-173,10.基金项目
国家重点基础研究发展计划(973计划) (2013CB036304),国家自然科学基金(51478109),"十二五"交通运输重大专项(2011318494160). （973计划）
