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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第12卷    第1期    总第63期    2015年2月

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文章编号:1672-7029(2015)01-0079-07
福州某软土地区深基坑开挖对周围建筑物影响的三维有限元分析
陈林靖1,余其凤1,戴自航1,2

(1. 福州大学 岩土工程研究所,福建 福州 350116;
2. 卧龙岗大学 土木、采矿与环境工程学院,澳大利亚 新南威尔士洲 2522
)

摘 要: 运用ABAQUS软件和二次开发的非线性弹性邓肯-张模型按照三维实体单元、壳单元、梁单元考虑接触相互作用的耦合有限元法,建立福州一典型软土基坑工程整体三维有限元分析模型,采用室内K0固结试样的邓肯-张参数,按总应力分析法对基坑开挖施工过程进行了数值模拟,研究结果表明:基坑的空间效应明显,较之规范建议“m”法,与现场实测值吻合良好。在此基础上,将基坑开挖施工可能影响到的周边建(构)筑物体现于模型中,则可较好地揭示基坑开挖可能对其造成的影响,为保护周边建(构)筑物的支护方案设计提供理论依据。

 

关键字: 软土地区;基坑;三维实体有限元;邓肯-张模型;周围建筑物

3D finite element analysis of the influence of excavation in soft soil areas in Fuzhou on the surrounding buildings
CHEN Linjing1,YU Qifeng1 ,DAI Zihang1,2

1. Institute of Geotechnical Engineering, Fuzhou University, Fuzhou 350116, China;
2. School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522

Abstract:In this paper, the ABAQUS software and secondary development of nonlinear elastic Duncan-Chang’s model were used to establish the whole 3D finite element model of soft soils under excavation in Fuzhou city using 3D solid elements, shell elements and beam elements which considered contact interaction. The Duncan-Chang constitutive model parameters attained by K0 consolidation sample were applied to simulate the construction process of excavation using total stress analysis method. It shows that the spatial effect of excavation engineering is evident and the estimated results of this model are in good agreement with the field measurements. But the calculation solutions with m method which is suggested by the current technical code cannot match exactly. Then the influence of the excavation on surrounding buildings is analyzed with the 3D finite element model. Therefore, it can reveal the influence law and provide theoretical basis to the supporting design of the surrounding buildings under excavation.

 

Key words: soft soil area; foundation pit; 3D entity finite element; Duncan-Chang''s model; surrounding buildings

ISSN 1672-7029
CN 43-1423/U

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