东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (7): 1038-1042.DOI: -

• 论著 • 上一篇    下一篇

层状砂土地基静力变形性状测试

李纯;朱浮声;张学元;   

  1. 东北大学资源与土木工程学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(90915005)

Deformation properties of layered sandy foundation soil tested with static additional load

Li, Chun (1); Zhu, Fu-Sheng (1); Zhang, Xue-Yuan (1)   

  1. (1) School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Li, C.
  • About author:-
  • Supported by:
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摘要： 结合工程实测,分析了大型基础下层状砂土地基基底有效附加应力、基础钢筋应力以及基底竖向变形的变化过程与分布规律.研究结果表明,受基坑降水影响,基底上覆土层有效应力增量对基底沉降的贡献不可忽略;基底压应力不能简单假设为均布荷载,基底最大荷载作用点不一定是最大沉降发生点,且基础中心点的沉降值也不一定就是最大沉降值;基底平面上沉降分布不均匀,最大沉降值只有14.22 mm;基础内钢筋应力处于交变状态,应力最大值不超过钢筋设计强度的22%.研究结论可为层状砂土地基及其上大型基础设计提供直接参考依据.

关键词: 层状砂土地基, 交变应力, 变形, 有效附加应力, 软弱夹层

Abstract: The whole variation and distribution of effective additional stress acted on the foundation base, tensile stress in reinforced bars in foundation concrete and vertical deformation of the foundation base were investigated via field monitoring. It is found that, the contribution of the effective stress increment of soils overlaid the foundation base to the settlement, which is influenced by dewatering of foundation pit, should not be neglected. Moreover, the compressive stress acted on foundation base can not be simply assumed as evenly distributed load, the resultant largest vertical deformation is not consistent with working point of the largest stress, and the settlement at the centre of foundation maybe not be the largest. Settlement located in different place is not usually uniform, and the largest settlement is only 14.22 mm; the tensile stress of reinforcing bars changed alternately with time, and the maximum tensile stress does not exceed about 22% of the allowable strength of reinforcing bars. Conclusions may offer a reference to the design of the large concrete footing and the layered sandy foundation base.

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