| 考虑混凝土支撑徐变的深基坑开挖有限元分析 |
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| 引用本文： | 赵世明,崔永高,陈卫东.考虑混凝土支撑徐变的深基坑开挖有限元分析[J].建筑科学,2009,25(11). |
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| 作者姓名： | 赵世明 崔永高 陈卫东 |
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| 作者单位： | 1. 上海大学土木工程系,上海,200072
2. 上海岩土工程勘察设计研究院有限公司,上海,200002 |
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| 摘 要： | 深基坑开挖时,支撑体系的刚度是影响基坑变形的关键因素之一,由混凝土徐变引起的支撑刚度衰减对基坑性状的影响,目前仍未很好解决。本文以上海某深基坑工程为例,在考虑钢筋混凝土支撑徐变的基础上,利用有限元软件ABAQUS,对开挖过程中支撑体系刚度衰减对围护结构工作性状的影响进行了有限元分析。分析时,土体采用Mohr-Coulomb理想弹塑性模型,围护墙与土体之间采用接触模型,考虑徐变效应而引起的支撑刚度衰减时,支撑模量采用按龄期调整的有效模量,进而分析了不同开挖阶段支撑轴力及围护墙侧移的变化规律。结果表明,混凝土支撑的徐变效应对围护结构的内力和变形影响较大,在基坑工程设计计算中应考虑这一影响。
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| 关 键 词： | 基坑开挖 徐变效应 支撑轴力 有限元分析 |
Finite Element Analysis of Deep Excavation Considering Creep Behavior of Concrete Bracing |
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| ZHAO Shi-ming,CUI Yong-gao,CHEN Wei-dong.Finite Element Analysis of Deep Excavation Considering Creep Behavior of Concrete Bracing[J].Building Science,2009,25(11). |
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| Authors: | ZHAO Shi-ming CUI Yong-gao CHEN Wei-dong |
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| Affiliation: | 1.Department of Civil Engineering;Shanghai University;Shanghai 200072;China;2.Shanghai Geotechnical Investigations & Design Institute Co.;Ltd.;Shanghai 200002;China |
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| Abstract: | The stiffness of a bracing system is one of the key factors affecting the deformation of foundation pit in deep excavation.At present,the influence of stiffness attenuation of bracings due to concrete creep behavior on the properties of the foundation pit is not still solved perfectly.By taking the deep excavation engineering in Shanghai as an example and by considering the creep behaviour of reinforced concrete bracings,the finite element software ABAQUS is used to simulate the influence of the stiffness a... |
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| Keywords: | foundation pit excavation creep behaviour bracing axial force finite element analysis |
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