›› 2009, Vol. 30 ›› Issue (2): 297-304.

• 基础理论与实验研究 • 上一篇    下一篇

Y型沉管灌注桩加筋路堤力学性状试验研究

刘汉龙1, 2,王新泉1, 2,陈永辉1, 2,陆见华3   

  1. 1. 河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098;2. 河海大学 岩土工程科学研究所,南京 210098; 3. 浙江山水建设工程有限公司,杭州 310016
  • 收稿日期:2007-05-15 出版日期:2009-02-10 发布日期:2011-01-27
  • 作者简介:刘汉龙,男,1964年生,教授,博士,博士生导师,从事土动力学与地基基础工程教学与科研。
  • 基金资助:

    江苏省“333”高层次人才项目资助(No.B08003)。

Field experimental study of mechanical performance of Y-shaped vibro-pile reinforced embankments

LIU Han-long 1, 2, WANG Xin-quan 1, 2, CHEN Yong-hui 1, 2, LU Jian-hua3   

  1. 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 21098, China; 3. Zhejiang Shanshui Building Co. Ltd, Hangzhou 310016, China
  • Received:2007-05-15 Online:2009-02-10 Published:2011-01-27

摘要:

结合申嘉湖杭(上海―嘉兴―湖州―杭州)高速公路嘉兴段Y型沉管灌注桩处理桥头软基实体工程,通过路堤填筑荷载下Y型沉管灌注桩加筋路堤路基表面及桩帽上下应力分布的现场试验研究,获得了路堤荷载下桩帽间土体表面应力、桩帽上应力及桩帽下土体表面应力的分布及变化规律,比较了距桩不同位置处桩帽间土体表面应力差别、桩帽上与桩帽下应力差别、桩帽下与桩帽间土体表面应力差别、桩帽上与桩顶上应力差别,分析了桩-土应力比及荷载分担比在路堤填筑荷载下变化趋势及规律。通过特殊加载时间段,分析了路堤填筑加载后应力及桩-土应力比调整规律。通过路堤进入预压期后的观测数据,分析了路堤进入预压期后桩-土应力比及荷载分担比变化规律。

关键词: Y型沉管灌注桩, 加筋路堤, 应力分布, 桩-土应力比, 荷载分担比

Abstract:

Based on the soft ground improvement project at Jiaxing section of Shen-Jia-Hu-Hang Expressway using Y-shaped vibro-pile, field tests on reinforced embankment with Y-shaped vibro-pile were performed to study stress distribution at road embankment surface, and above and under pile caps under road embankment load; so that the stress distribution and change rules were obtained. A series of stress differences were compared at specific positions, such as different points at soil surface among pile caps, above and under pile caps, soil surface under pile caps and among pile caps, on pile caps and pile heads. The changing tendency and rule of pile-soil stress ratio and load distribution ratio under road embankment load were analyzed. The adjusting process of soil stress and pile-soil stress ratio after filling was analyzed during special time period. The adjusting rule of pile-soil stress ratio and load distribution ratio during preloading period were also analyzed based on the monitoring data during preloading period.

Key words: Y-shaped vibro-pile, reinforced embankments, stress distribution, pile-soil stress ratio, load sharing ratio

中图分类号: 

  • TU 472
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