地下空间增层开挖双排桩支护体系 工作特性研究
DOI:
作者:
作者单位:

山东科技大学

作者简介:

通讯作者:

中图分类号:

TU 473.1

基金项目:

山东省自然科学(ZR2019MEE027)


Study on working characteristics of double-row pile support system inunderground space with additional layer excavation
Author:
Affiliation:

Shandong University of Science and Technology

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    目前地下空间的利用率较低,为缓解人们生活空间不足的问题,以位于杭州某商业中心建筑功能为酒店的项目为原型,进行既有建筑地下空间向下增层开挖相似模型试验,实验模拟了支护—开挖过程。既有建筑地下增层过程中,既有支护结构不足以提供足够的支护作用,需要补入新增支护结构,在新的支护体系中,既有支护桩支护特性会发生显著变化,因此对基坑坡面水平位移、桩身弯矩等变化规律进行研究,分析新增支护桩,既有支护桩体系的受力机理,实验模拟精度较高;不可控参数中的土体粘聚力、摩擦角以及可控因素中的桩身长度、桩间距等对支护效果影响较大,模型实验数据可为既有建筑向下增层设计参数选取提供参考。实验结果表明:随着地下层增层开挖深度的增加桩基的桩顶水平位移越来越大,增加速率表现为越来越快的趋势;桩身的弯矩随开挖深度呈线性增加,且为弓形分布即中间大两头小;既有支护桩是否有冠梁对支护体系的鲁棒性有较大影响。

    Abstract:

    At present, the utilization rate of underground space is relatively low.? In order to alleviate the problem of insufficient living space for people, a similar model test of excavation of underground space of existing buildings with additional layers down was carried out based on the project of building function as a hotel in Hangzhou commercial Center. The experiment simulated the process of support and excavation. In the process of underground layer addition of the existing building, the existing supporting structure is not enough to provide sufficient support function, so it is necessary to add the new supporting structure. In the new supporting structure, the supporting characteristics of the existing supporting pile will change significantly. Therefore, the change law of the horizontal displacement of the foundation pit slope and the bending moment of the pile body will be studied to analyze the stress mechanism of the new supporting pile and the existing supporting pile system. The experimental simulation accuracy is high; Uncontrollable parameters such as soil cohesion, friction Angle and controllable factors such as pile length and pile spacing have a great influence on the supporting effect. The model experimental data can provide references for the selection of design parameters for the downward layer addition of existing buildings. The experimental results show that the horizontal displacement of pile top of pile foundation increases with the increase of excavation depth of underground layer. The bending moment of pile body increases linearly with the excavation depth, and the bending moment of pile body has a bow distribution, that is, the middle is large and the two ends are small. Whether the existing supporting pile has crown beam or not has great influence on the robustness of the supporting system.

    参考文献
    相似文献
    引证文献
引用本文

孔德森. 地下空间增层开挖双排桩支护体系 工作特性研究[J]. 科学技术与工程, , ():

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2023-08-23
  • 最后修改日期:2024-03-12
  • 录用日期:2024-03-21
  • 在线发布日期:
  • 出版日期:
×
亟待确认版面费归属稿件,敬请作者关注