既有建筑物地下室增层开挖群桩沉降性状研究

单华峰; 夏唐代; 俞峰; 楼春晖

doi:10.11779/CJGE2015S1010

既有建筑物地下室增层开挖群桩沉降性状研究 English Version

单华峰^{1, 2},
夏唐代^{1, 2},
俞峰³,
楼春晖^{1, 2}

1. 软弱土与环境土工教育部重点实验室（浙江大学）,浙江杭州 310058; 2. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310058; 3. 浙江理工大学建筑工程学院,浙江杭州 310018

基金项目: 国家自然科学基金项目（41472284,51378463）

详细信息

作者简介:
单华峰(1987- ),男,博士研究生,主要从事桩基础设计理论及应用等方面的研究。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Settlement of pile groups associated with excavation beneath existing basement

SHAN Hua-feng^{1, 2},
XIA Tang-dai^{1, 2},
YU Feng³,
LOU Chun-hui^{1, 2}

1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Research Center of Costal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China

摘要

摘要: 既有建筑物地下室增层开挖会改变原有桩基础的沉降性状。采用双曲线模型来模拟桩侧及桩端阻力的发挥函数,并结合剪切位移法求出该模型参数。然后通过荷载传递法,建立增层开挖工况下群桩基础中基桩的控制方程。结合工程实例,利用ADINA有限元软件建立三维实体模型,得到群桩基础中基桩的p-s曲线,并与本文的计算方法进行对比验证。最后,研究了地下室增层开挖工况对群桩基础中基桩沉降性状的影响。分析得出,随着增层开挖深度的增大,方形布桩中心桩的桩顶沉降量在不断增加;在同一开挖深度时,角桩的沉降量最大,边桩次之,中心桩最小;不同的布桩形式对中心桩沉降性状会有一定的影响。
- 群桩基础 /
- 开挖 /
- 既有建筑 /
- 基桩沉降 /
- 软土
Abstract: Settlement behaviors of pile groups caused by excavation under the basement of an existing building are studied. The hyperbolic model is used to simulate the functions of both pile side and end resistances. The shearing displacement method is employed to calculate the parameters of hyperbolic model of pile side and end resistances. Then, the governing equation for piles is established by using the load transfer method. The reliability of the proposed method is validated by the p-s curves simulated by the ADINA finite element software. The effect of settlement behavior of piles under further excavation is analyzed as well. The results reveal that, the head settlement of the central pile among square arrangement increases with the increasing excavation depth; under the same excavation depth, the head settlements of the corner pile, the side pile and central pile are the maximum, the medium and the minimum, respectively. In addition, different pile arrangements have a certain impact on the settlement behavior of the central pile.
- pile group /
- excavation /
- existing building /
- pile settlement /
- soft soil

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参考文献(10)

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