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粉砂中筒型基础沉贯过程筒-土作用机理试验研究

陈飞, 练继建, 马煜祥, 张杰, 卜同胜

陈飞, 练继建, 马煜祥, 张杰, 卜同胜. 粉砂中筒型基础沉贯过程筒-土作用机理试验研究[J]. 岩土工程学报, 2015, 37(4): 683-691. DOI: 10.11779/CJGE201504014
引用本文: 陈飞, 练继建, 马煜祥, 张杰, 卜同胜. 粉砂中筒型基础沉贯过程筒-土作用机理试验研究[J]. 岩土工程学报, 2015, 37(4): 683-691. DOI: 10.11779/CJGE201504014
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CHEN Fei, LIAN Ji-jian, MA Yu-xiang, ZHANG Jie, BU Tong-sheng. Model tests on bucket-soil interaction during installation of bucket foundation in silt sand[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 683-691. DOI: 10.11779/CJGE201504014
Citation: CHEN Fei, LIAN Ji-jian, MA Yu-xiang, ZHANG Jie, BU Tong-sheng. Model tests on bucket-soil interaction during installation of bucket foundation in silt sand[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 683-691. DOI: 10.11779/CJGE201504014
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粉砂中筒型基础沉贯过程筒-土作用机理试验研究  English Version

  • 1. 天津大学水利工程仿真与安全国家重点实验室,天津 300072; 2. 水利部水利水电规划设计总院,北京 100120

基金项目: 国家国际科技合作专项项目（2012DFA70490）; 创新研究群体科学基金项目（51321065）; 高等学校创新引智计划（B14012）
详细信息
    作者简介:

    陈飞(1986- ),男,博士,主要从事水工、海上风电基础工程等方面的学习和研究。E-mail: feichen@tju.edu.cn。

Model tests on bucket-soil interaction during installation of bucket foundation in silt sand

  • 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; 2. General Institute of Water Resources and Hydropower Planning and Design, Beijing 100120, China

摘要

    摘要
  • 摘要: 筒型基础沉贯安装是一项关键施工过程,目前相关研究多集中在沉贯阻力与吸力的计算方法上,而缺乏对沉贯过程筒-土作用机理研究。针对这一问题,开展了粉砂中筒型基础沉贯试验,得到了静压和吸力沉贯工况下筒壁内、外侧所受土压力发展变化规律。静压试验结果表明,筒壁内侧所受土压力远大于外侧,内侧土体挤压程度随下沉深度增加而增大,外侧相反。吸力试验结果表明,施加吸力时内侧土压力减小,外侧土压力先增大后迅速减小至稳定值,吸力产生的渗流可以大大减小端阻力与内侧摩阻力。试验结果还表明现有临界吸力计算公式是过于保守的,并根据试验结果对现有计算所需吸力的方法进行了修正,得到了一种更加准确的计算方法。
    Abstract: The installation of bucket foundation is a vital construction procedure. The existing relative studies have mainly focused on the methods for calculating the penetration resistance and required suction. However, the understanding of the soil-skirt interaction during the installation is not clear yet due to inadequate test data. Model tests on the installation of bucket foundation are carried out in silt sand. The inner and outer soil pressures on the skirt are measured under both jacking installation and suction installation conditions. The jacking test results show that the inner soil pressures on the skirt are much larger than the outer ones. The compaction extent of the inner sand grows with the increase of the penetration depth, which is contrary to that of the outer sand. The suction test results show that the inner soil pressures decrease dramatically when the suction is applied. The outer soil pressures, however, increase firstly and then fall down to stable values rapidly. The inner friction and tip resistance are greatly reduced due to the seepage effects. The test results also indicate that the existing critical suction is too conservative. Based on the test results, the existing prediction method for the required suction is modified and evaluated, and a more accurate method is obtained.
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    • 参考文献(19)
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出版历程
  • 收稿日期:  2014-03-05
  • 发布日期:  2015-05-05

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