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国家自然科学基金(50679041)

作品数:40 被引量:865H指数:17
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40 条 记 录,以下是 1-10
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二维Biot固结方程的自然单元法求解被引量:1
2008年
为了使自然单元法能够应用于土体等多孔介质的流固耦合计算,通过结合Biot固结理论及自然单元法自身特点,利用经典变分原理推导了固结微分方程的离散形式,并针对二维问题编制了相应的计算程序.算例结果表明,自然单元法的结果与解析解吻合良好,其精度高于有限单元法.从而验证了自然单元法在固结分析中的正确性,拓展了自然单元法的适用范围.
褚衍标王建华
关键词:自然单元法BIOT固结方程
抗拔桩在大面积深开挖过程中的受力特性分析被引量:54
2009年
由大面积大深度基坑开挖引起的土体卸荷回弹会对坑底桩基产生不利影响,这一影响对抗拔桩尤为突出。针对上海世博地下变电站的抗拔桩设计,采用基于非线性有限元的数值方法对抗拔桩在大面积深开挖过程中的受力特性进行了研究。首先通过对抗拔桩地面单桩静载荷试验结果的反分析确定土层本构参数,然后对抗拔桩在开挖过程和正常使用状态下的受力特性进行了数值分析。分析结果表明,基坑开挖引起的桩身轴力对抗拔桩的负面影响较轴心受压桩更为明显,在抗拔桩设计中应充分考虑开挖引起的预拉力,且扩底抗拔桩受到的预拉力大于等截面桩。正常使用状态下桩身轴力是土体回弹隆起引起的轴力和桩顶上拔的引起的轴力的叠加,应以此对桩身的钢筋配置进行校核。
陈锦剑王建华范巍王卫东
关键词:抗拔桩深开挖桩土共同作用预拉力
The Settlement Characteristic of Underground Urban Complex in Shanghai被引量:4
2009年
The effects of excavation unloading, construction reloading and underground water on basal heave of excavation projects were presented and analyzed based on the measurement results of an underground urban complex which was located in Shanghai. The effects on water pressure and building settlements were analyzed as well. The numerical analyses by finite element method (FEM) were conducted. It showed that the soil under the excavation base continued to heave during the following certain construction stage. It also found that the bearing capacity of uplift piles which supported the buildings affected the structure quality significantly. The conclusions can be applied in future projects.
贾坚王建华楼晓明谢小林刘传平
水平荷载下大直径嵌岩桩的承载力特性研究被引量:46
2007年
通过某大型码头桩基工程的现场试验结合数值分析研究了水平荷载作用下大直径嵌岩钢管混凝土桩的工作机理。根据桩身变形、内力和地基抗力的测试结果分析了大直径嵌岩桩的水平承载特性、桩岩共同作用性状及套箱填砂对深水嵌岩桩水平承载力的影响。采用有限元方法并考虑桩岩(土)界面在受力后滑动脱开的影响,对试验结果进行了数值模拟,并进一步探讨了大直径嵌岩桩的合理嵌岩深度及其主要影响因素。
王建华陈锦剑柯学
关键词:大直径嵌岩桩水平承载力桩土界面静载荷试验有限元法
The Application of a Small Strain Model in Excavations被引量:7
2009年
The importance of soil small strain effect on soil-structure behavior was investigated by researchers in last decades. The finite element method (FEM) is always used to predict the excavation behavior, whereas there are not many soil models available to consider this effect in analysis. This paper introduces a simple small strain soil model--hardening small-strain (HSS) in PLAXIS 8.5 and exhibits its application in excavation problems via studying the history of two cases. The analyses also use two familiar soil models: hardening-soil (HS) model and Mohr-Coulomb (MC) model. Results show that the HSS predicts more reasonable magnitudes and profiles of wall deflections and surface settlements than other models. It also indicates that the small strain effect relies on the strain level which is induced by excavation.
宣锋夏小和王建华
关键词:EXCAVATION
深基坑施工对历史建筑的变形影响及控制研究被引量:31
2012年
城市建筑密集区内深基坑施工对邻近历史建筑的影响及其保护是城市地下空间开发过程中出现的典型技术难题。结合某紧邻历史保护建筑的地铁车站深基坑工程,基于FLAC3D建立考虑土体与结构相互作用的三维整体计算模型,采用三维数值模拟结合现场监测对复杂环境下深基坑施工对历史建筑的变形影响及相应变形控制措施进行研究,探讨不同基坑支护方案及技术措施对基坑变形控制及历史建筑保护的有效性。结果表明:计算模型能够较好地预测基坑围护墙变形及对邻近历史建筑沉降的影响,隔断桩侧向变形及建筑基础沉降与基坑围护墙侧向变形具有较强的关联性,是否设置单排隔断桩及隔断桩间距调整对土体侧向变形的影响较小。
丁勇春程泽坤王建华徐安军李耀良
关键词:基坑历史建筑数值模拟逆作法地基加固
多级梯次联合围护基坑开挖对环境影响分析被引量:10
2009年
上海虹桥枢纽基坑工程开挖面积超大,平面布置复杂,开挖深度不一,采用多级梯次联合围护体系。本文采用数值方法对这种新型复杂围护体系的变形特性进行了分析,土体采用硬化(HS)模型,并对该模型的主要参数取值做了分析讨论。最终给出大面积多级梯次联合围护基坑的变形特性。
刘一杰王建华陈锦剑李进军
关键词:基坑
基于FLAC3D的基坑开挖与支护三维数值分析被引量:71
2009年
采用三维快速拉格朗日方法(FLAC3D)建立了考虑基坑分步开挖与支护全过程的三维动态计算模型,土体采用修正剑桥模型模拟,考虑了支护结构与土体的接触滑移作用,分析了基坑施工中围护墙变形、地表沉降、坑底隆起、坑外深层土体变形的基本特性.计算得到的地表沉降曲线与已有文献的经验沉降曲线基本一致,验证了计算结果的适用性.分析结果可为类似基坑工程的设计和施工提供有益参考.
丁勇春王建华徐斌
关键词:基坑开挖修正剑桥模型土与结构相互作用
Numerical Study of Damage Potential in Buildings due to Excavations
2010年
Evaluation industrial factory building damage potential due to ground movements caused by excavations inside the building is a critical design consideration when reconstructing the underground equipment of the industrial factory building. In this paper,the behavior of a support system for a reconstruction project of underground equipment of the industrial factory building in Shanghai and its effects on a pile-foundation supported building are presented. The 8.1 m deep excavation is made through soft clay to fine sand and retained by the 800 mm thick pile wall and the bracing system. Field observation data are collected,especially such as the lateral displacements of columns,settlement of cushion caps,and general building deformation trends. A 3D finite element method (FEM) procedure is demonstrated here with considering of interaction between soils and structures,and is conducted to examine responses of retaining wall,columns,and cushion caps due to excavations. The proposed numerical model is shown to adequately reflect the responses of the industrial building factory caused by excavations inside the building. The results of numerical prediction are close to the field observation.
侯悦琪王怀忠王建华
关键词:EXCAVATION
Vertical Bearing Behavior of Cast-in-Place Diaphragm Wall in Shanghai
2010年
When diaphragm wall is used as the permanent vertical bearing structure,design standard of the bored pile adopted has to induce the risk or iste. The vertical load transfer mechanism and bearing capacity of the diaphragm wall are examined by a field testing program at the site in Shanghai soft clays. Test results indicate that the diaphragm wall almost behaves as a rigid body under the vertical load. It induces that the skin friction and the toe resistance of the wall develop simultaneously. The skin friction resistance carries the large portion of the vertical load,and the toe resistance of the wall provides about 9.2% of vertical bearing load. Toe-grouting technique is found to achieve a remarkable increase in skin friction and toe resistance. The toe resistance of the grouted wall provides about 17.5% of vertical load.
侯永茂王建华陈锦剑顾倩燕
关键词:SETTLEMENT
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