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开挖卸荷桩土界面荷载传递模型的修正与验证
  • ISSN号:0367-6234
  • 期刊名称:《哈尔滨工业大学学报》
  • 时间:0
  • 分类:TU473[建筑科学—结构工程;建筑科学—土工工程]
  • 作者机构:[1]同济大学地下建筑与工程系,上海200092, [2]同济大学岩土及地下工程教育部重点试验室,上海200092
  • 相关基金:国家自然科学基金资助项目(41272288)
中文摘要:

为了准确预测深开挖条件下桩基的承载变形性状,在桩土界面荷载传递计算模型中考虑了卸荷效应.基于快速拉格朗日法(FLAC3D),将线弹性-完全塑性的桩土界面荷载传递模型修正为双曲线计算模型,修正后的模型可以考虑开挖卸荷后桩周土体法向应力减小对桩土界面剪切刚度的影响,也可以考虑开挖深度、面积和桩长对桩端阻力的影响.利用修正模型对开挖条件下砂土地基中的单桩进行了足尺数值试验,分析计算了开挖后桩基的承载性能,并将修正后模型的计算值与软件内嵌的线弹性-完全塑性模型的计算值及试验值进行对比分析.结果表明:修正后计算模型和传统计算模型都能够较准确地预测开挖条件下桩基总极限承载力,但是,修正计算模型考虑了支护结构外围土体对桩端承载力的贡献,能更准确地预测桩身下部侧摩阻力与桩端阻力.因此,修正计算模型更适合开挖条件下的桩基承载力计算.

英文摘要:

An improved hyperbolic model of load-transfer for the pile-soil interface under deep excavation conditions was developed. It not only considered the influence on the initial shear stiffness because of excavation which decrease the normal stress of the surrounding soil, but also considered the influence of excavation depth, width and length of pile. A full-scale numerical experiment was completed on a single pile in sandy soil after excavation and the bearing capacity of pile foundation was analyzed using this model, and then the results was compared with the measurement and the calculating values, which were calculated from the traditional model. It was shown that the ultimate bearing capacity of pile foundation after excavation, which was calculated from both model, are closed to measurement. The tip resistance and shaft friction on the bottom of pile calculating from traditional model which cannot consider the contribution of soil for the pile tip behind the supporting structure, however, have significant differences compared with the measurement. So, the improved model is better to estimate the shaft friction and tip resistance for the pile foundation after excavation.

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期刊信息
  • 《哈尔滨工业大学学报》
  • 中国科技核心期刊
  • 主管单位:中华人民共和国工业和信息化部
  • 主办单位:哈尔滨工业大学
  • 主编:冷劲松
  • 地址:哈尔滨市南岗区西大直街92号
  • 邮编:150001
  • 邮箱:
  • 电话:0451-86403427 86414135
  • 国际标准刊号:ISSN:0367-6234
  • 国内统一刊号:ISSN:23-1235/T
  • 邮发代号:14-67
  • 获奖情况:
  • 2000年获黑龙省科技期刊评比一等奖,中国期刊方阵“双效”期刊
  • 国内外数据库收录:
  • 美国化学文摘(网络版),美国数学评论(网络版),德国数学文摘,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:27329