路基工程Issue(2)：62-70,9.DOI:10.13379/j.issn.1003-8825.202307066
水载预压下复合地基沉降及桩土受力特性分析
Analysis on the Settlement and Characteristics of Pile-soil Stress for Composite Foundation under Water Preloading
摘要
Abstract
Taking T3 section of a highway in Guangdong province as the research object,in some sections,the prefabricated piles composite foundation is used to strengthen the soft soil foundation.which used the water bag loading method for equal load pre-pressure,three typical detection sections are selected to embed sensors to monitor and analyze the foundation soil and pile settlement,soil pressure and pile axial force change rule.The results show that the pile body is the main loaded body in the composite foundation,and the setting of bedding layer can make it produce stabbing deformation to effectively mobilize the bearing capacity of foundation soil.There is a hysteresis in the load transfer in the foundation,and the load transfer rate can be improved by increasing the loading rate,the graded loading can help to achieve a better pre-compression effect.Too large loading rate will lead to the fluctuation of soil pressure and pile axial force,and the pile and soil jointly bear the upper load through load redistribution.By using water-loading preloading combined with prefabricated pile composite foundation to treat soft soil subgrade,it can not only reduce the construction cost by 30％,but also effectively improve the stability of the foundation after construction.关键词
复合地基/水载预压/现场实测/地基沉降/桩土应力/预制管桩Key words
composite foundation/water preloading/field measurement/ground settlement/pile soil stress/prefabricated piles分类
建筑与水利引用本文复制引用
周大垚,倪芃芃..水载预压下复合地基沉降及桩土受力特性分析[J].路基工程,2024,(2):62-70,9.基金项目
国家自然科学基金面上项目(52078506) （52078506）
广东省自然科学基金面上项目(2023A1515012159) （2023A1515012159）
