• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tunnelling and underground space technology >3D finite element analysis of pile responses to adjacent excavation in soft clay: Effects of different excavation depths systems relative to a floating pile
【24h】

3D finite element analysis of pile responses to adjacent excavation in soft clay: Effects of different excavation depths systems relative to a floating pile

机译：软黏土中桩对邻近开挖的响应的3D有限元分析：不同开挖深度系统相对于浮动桩的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To gain new insights into single pile responses to adjacent excavations in soft ground, three dimensional numerical parametric studies are carried out. An advanced hypoplastic (clay) constitutive model which takes account of small-strain stiffness is adopted. The effects of excavation depths (H-e) relative to pile (L-p) were investigated by simulating the excavation near the pile shaft (i.e., H-e/L-p = 0.67), next to (H-e/L-p= 1.00) and below the pile toe (H-e/L-p = 1.33). In addition, the effect of pile head boundary conditions and different working loads with FOS = 3.0 and 1.5 were also studied. The model parameters are calibrated and validated against measured results in centrifuge reported in literature. It is found that the pile responses to excavation depend upon formation level of the excavation as well as the embedded depth of the wall. With different wall depth in each case, the induced settlement, lateral displacement and bending moment in the pile at the same stage of the excavation was different in the three cases. Among the three cases, the excavation in case of H-e/L-p = 1.33 resulted in the largest pile settlement (i.e., 7.6% pile diameter). On the other hand, the largest pile deflection was induced in case of H-e/L-p = 0.67. On contrary, insignificant bending moment and changes in axial load distribution induced in the pile on completion of the excavation in each case. However, significant bending moment (60% of pile BM capacity of 800 kNm) induced in the pile with fixed head condition. The different working loads (with FOS = 3.0 and 1.5) influence induced pile settlement but have relatively minor effect on induced bending moment.
机译：为了获得对软土地基中相邻基坑单桩反应的新见解，我们进行了三维数值参数研究。采用了考虑小应变刚度的先进的塑性（黏土）本构模型。通过模拟桩身附近（即He / Lp = 0.67），旁边（He / Lp = 1.00）和桩头（He）下方的开挖，研究了开挖深度（He）相对于桩（Lp）的影响。 / Lp = 1.33）。此外，还研究了桩头边界条件和FOS = 3.0和1.5时不同工作载荷的影响。根据文献报道的离心机中的测量结果对模型参数进行校准和验证。发现桩对开挖的响应取决于开挖的形成水平以及墙的埋入深度。在每种情况下，由于墙体深度不同，三种情况下在同一开挖阶段的桩中诱发的沉降，横向位移和弯矩都不同。在这三种情况下，H-e / L-p = 1.33的情况下的开挖导致最大的桩沉降（即，桩直径的7.6％）。另一方面，在H-e / L-p = 0.67的情况下，引起最大的桩挠度。相反，在开挖完成时，在桩中引起的弯矩很小，并且在桩中引起的轴向载荷分布的变化。但是，在具有固定水头条件的桩中会产生明显的弯矩（桩的BM能力800 kNm的60％）。不同的工作载荷（FOS = 3.0和1.5）会影响桩的沉降，但对桩弯矩的影响相对较小。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号