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DX桩 15

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Numerical evaluation of group-pile foundation subjected to cyclic horizontal load

Youngji JIN, Xiaohua BAO, Yoshimitsu KONDO, Feng ZHANG,

《结构与土木工程前沿（英文）》 2010年第4卷第2期页码 196-207 doi: 10.1007/s11709-010-0021-6

摘要： In this paper, three-dimensional (3D) finite element analyses of a real-scale group-pile foundation subjected to horizontal cyclic loading are conducted using a program named DBLEAVES. In the simulations, nonlinear behaviors of ground and piles are described by subloading model and the axial-force dependent model (AFD model) which considered the axial-force dependency in the nonlinear moment-curvature relations. In order to consider the influence of an effective stress path on the prediction of the group-pile foundation, the analyses are conducted within the framework of the soil-water coupling method with finite-difference and finite-element regime. The material parameters of soils are determined based on conventional triaxial drained compression tests on undisturbed and remolded specimens. The applicability of the proposed numerical method is encouraging, and therefore, it is quite confident to say that the method can be used to predict the mechanical behaviors of group-pile foundation to a satisfactory accuracy, particularly with the effective stress analysis.

关键词： group-pile foundation real-scale cyclic loading test three-dimensional finite element method (3D-FEM) soil-water coupling analysis undisturbed and remolded specimens

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Centrifuge model test on dynamic behavior of group-pile foundation with inclined piles and its numerical

ZHANG Feng, OKAWA Katsunori, KIMURA Makoto

《结构与土木工程前沿（英文）》 2008年第2卷第3期页码 233-241 doi: 10.1007/s11709-008-0033-7

摘要： In this paper, dynamic behavior of a group-pile foundation with inclined piles in loose sand has been investigated with centrifuge model tests. The test results are also simulated with elastoplastic dynamic finite element method, in which, not only sectional force of piles, stress of ground, but also deformation of piles are calculated using a three-dimensional elastoplastic dynamic finite element analysis (Code name: DGPILE-3D). The numerical analyses are conducted with a full system in which a superstructure, a pile foundation and surrounding ground are considered together so that interaction between pile foundation and soils can be properly simulated because the nonlinearities of both the pile and the ground are described with suitable constitutive models. Different types of piles, vertical pile or inclined pile, are considered in order to verify the different characteristics of a group pile foundation with inclined piles. The validity of the calculation is verified by the model tests.

关键词： centrifuge Different three-dimensional elastoplastic calculation inclined

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Construction technology on pile foundation of No. 6 main pier in Dashengguan Yangtze Bridge

Hongbin YU , Zeping LIAN ,

《结构与土木工程前沿（英文）》 2009年第3卷第3期页码 339-343 doi: 10.1007/s11709-009-0047-9

摘要： Based on pile foundation construction of No. 6 main pier, deep mudstone geological foundation and deep-water construction in Nanjing-Dashengguan Yangtze Bridge, the method of super-large-diameter bored pile in deep water is studied. The spread drill, application of PHP mud, and choice of machine are solved by adopting two machines of KTY4000 and KPG300A. Besides, the airlift reversing circulation is selected in slag discharge. The results show that this method can ensure successfully the construction of pier foundation to satisfy the demands of codes.

关键词： PHP slurry KTY4000 drilling machine KPG3000A drilling machine spread drill

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Optimum lateral extent of soil domain for dynamic SSI analysis of RC framed buildings on pile foundations

Nishant SHARMA, Kaustubh DASGUPTA, Arindam DEY

《结构与土木工程前沿（英文）》 2020年第14卷第1期页码 62-81 doi: 10.1007/s11709-019-0570-2

摘要： This article describes a novel approach for deciding optimal horizontal extent of soil domain to be used for finite element based numerical dynamic soil structure interaction (SSI) studies. SSI model for a 12 storied building frame, supported on pile foundation-soil system, is developed in the finite element based software framework, OpenSEES. Three different structure-foundation configurations are analyzed under different ground motion characteristics. Lateral extent of soil domain, along with the soil properties, were varied exhaustively for a particular structural configuration. Based on the reduction in the variation of acceleration response at different locations in the SSI system (quantified by normalized root mean square error, ), the optimum lateral extent of the soil domain is prescribed for various structural widths, soil types and peak ground acceleration levels of ground motion. Compared to the past studies, error estimation analysis shows that the relationships prescribed in the present study are credible and more inclusive of the various factors that influence SSI. These relationships can be readily applied for deciding upon the lateral extent of the soil domain for conducting precise SSI analysis with reduced computational time.

关键词： soil structure interaction optimum lateral extent of soil domain length multi-storyed framed building pile foundation OpenSEES L-K boundaries dynamic analysis

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21世纪的桩基新技术：DX旋挖挤扩灌注桩

王梦恕,贺德新,唐松涛

《中国工程科学》 2012年第14卷第1期页码 4-12

摘要：

桩基作为一种古老的建筑形式在当前的发展中仍发挥着巨大的作用。伴随着工艺和技术的革新，各种新桩型不断地涌现，并取得了巨大成功。DX桩作为其中的一种较为突出的桩型得到了广泛的应用。笔者从DX桩的发展、工艺特点、成桩优势、国内外研究进展以及工程应用等多方面进行了详细的阐述。

关键词： DX桩承载机理承载力沉降

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Displacement and force analyses of piles in the pile-caisson composite structure under eccentric inclined

《结构与土木工程前沿（英文）》 doi: 10.1007/s11709-023-0957-y

摘要： A novel anchorage for long-span suspension bridges, called pile-caisson composite structures, was recently proposed by the authors in an attempt to reduce the construction period and costs. This study aims to investigate the displacement and force behavior of piles in a pile-caisson composite structure under eccentric inclined loading considering different stratum features. To this end, both 1g model tests and three-dimensional numerical simulations were performed. Two groups of 1g model tests were used to validate the finite-element (FE) method. Parametric studies were then performed to investigate the effects of groundwater level, burial depth of the pile-caisson composite structure, and distribution of soil layers on the performance of the pile-caisson composite structure. The numerical analyses indicated that the influence of the groundwater level on the stability of the caisson was much greater than that of the piles. In addition, increasing the burial depth of the pile-caisson composite structure can assist in reducing the displacements and improving the stability of the pile-caisson composite structure. In addition, the distribution of soil layers can significantly affect the stability of the pile-caisson composite structure, especially the soil layer around the caisson.

关键词： composite structure piles foundation suspension bridge 1g model test finite-element analysis

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DX旋挖挤扩灌注桩群桩数值分析研究

万飞,张德华

《中国工程科学》 2012年第14卷第1期页码 46-50

摘要：

通过数值计算软件FLAC3D对DX旋挖挤扩灌注桩（简称DX桩）群桩的承载性状和桩周土体的沉降规律进行了研究。分析了桩间距、承力盘布置对群桩极限承载力和沉降控制能力的影响，并比较了6根基桩的DX群桩和8根基桩的直桩群桩的极限承载力。研究结果表明：DX群桩的基桩具有DX单桩的受力性状。承力盘下方土体位移大于承力盘上方土体位移，盘腔上部出现临空面。3D(D为盘径)桩间距的承载力和沉降控制能力最佳。同一地层内，承力盘布置方式（平行、错开布置）对DX群桩的承载力影响甚微。6根基桩的DX群桩的极限承载力是8根基桩的直

关键词：桩基础极限承载力数值计算 DX群桩

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海上风机桩式基础结构形式综合模糊优选

翟钢军,李玉刚,康海贵

《中国工程科学》 2010年第12卷第11期页码 40-46

摘要：

针对海上风机基础设计中经常遇到复杂的方案优化选型问题，将多因素、多级模糊优选理论引入到基础的设计选型中。针对影响因素复杂、确定隶属函数主观因素较强的情况，成功引入因素的优先关系法来确定优选矩阵的隶属度，较好地解决了确定隶属函数的人为影响。通过此优选模型成功地将影响基础设计选型的13 种主要因素和4 种桩基基础设计形式进行了多级模糊综合优选决策，得到了比较理想的决策结果，为海上风机基础设计选型提供了新的思路。

关键词：海上风机桩基选型优化模糊决策

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海上风电场基础形式及配套施工技术

秦顺全,张瑞霞,李军堂

《中国工程科学》 2010年第12卷第11期页码 35-39

摘要：

根据不同的水深及地质条件，结合已建成的海上风电场基础形式及施工方法，介绍和研究了重力式、单桩、群桩、设置沉箱、沉井及吸力式筒形基础等几种形式。对不同的基础形式，分别提出了自升式平台、浅吃水半潜驳、打桩船及整体浮运吊装等相应的基础施工方法。根据风机机组类型，对塔筒和风机的安装也做了介绍。

关键词：海上风电场基础形式桩基础导管架基础吸力式筒形基础设置沉箱风机安装

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DX桩在桥梁基础中的应用

张德华,齐万鹏,贺德新,贺建东,孙君平,郭桂霞

《中国工程科学》 2012年第14卷第1期页码 65-68

摘要：

DX桩以其单桩承载力高沉降量小的优点，在一般工业与民用建筑中得到了比较广泛的应用。最近一些桥梁工程也采用了这种新型桩技术。以北京市某桥梁工程为实例，通过试桩抗压静荷载试验，得出单桩竖向抗压承载力试验值，并且从单桩竖向抗压承载力、桩沉降量方面与直孔桩作了比较，还简单地分析了DX桩在受到竖向荷载作用时轴力沿桩身的分布情况以及在加载过程中DX桩上下盘盘阻的变化情况。

关键词： DX桩承载力桥梁静载荷实验

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苏通大桥主塔深水基础的设计与施工

任回兴,欧阳效勇,贺茂生,杨红,孙克强

《中国工程科学》 2009年第11卷第3期页码 38-43

摘要：

从建设条件、基础设计和施工等方面，介绍了苏通大桥主塔深水基础建设过程中在设计方面的部分考虑及施工过程中攻克深水、潮流、软基和通航等不利因素影响的一些方法，可供类似工程借鉴参考。

关键词：苏通大桥群桩基础钢吊箱冲刷防护

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Finite element prediction on the response of non-uniformly arranged pile groups considering progressivefailure of pile-soil system

Qian-Qing ZHANG, Shan-Wei LIU, Ruo-Feng FENG, Jian-Gu QIAN, Chun-Yu CUI

《结构与土木工程前沿（英文）》 2020年第14卷第4期页码 961-982 doi: 10.1007/s11709-020-0632-5

摘要： A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation, and basin-shaped settlement is often observed in practice. Large differential settlement of pile groups will decrease the use-safety requirements of building, even cause the whole-building tilt or collapse. To reduce differential settlement among individual piles, non-uniformly arranged pile groups can be adopted. This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups. Using the user-defined subroutine FRIC as the secondary development platform, a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software. As to the response analysis of a single pile, the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program. The reinforcing effects of individual piles is then analyzed using the present finite element analysis. Furthermore, the response of non-uniformly arranged pile groups, e.g., individual piles with variable length and individual piles with variable diameter, is analyzed using the proposed numerical analysis method. Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes.

关键词： numerical simulation non-uniformly arranged pile groups differential settlement pile-soil interaction

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海洋桥梁工程施工技术及装备发展研究

张瑞霞

《中国工程科学》 2019年第21卷第3期页码 5-11 doi: 10.15302/J-SSCAE-2019.03.015

摘要：

随着全球经济一体化战略的实施，海洋桥梁已成为各国基础设施重要的组成部分，这条绚丽的蓝色纽带也将带动海洋经济的快速发展。目前，已建成的海洋桥梁结构形式及施工装备还远不能满足桥梁向纵深海域发展的需要，为储备高端关键技术，迫切需要深入海洋桥梁施工技术及装备发展战略研究。在深水基础方面，着重对沉井基础、设置基础及大直径钢桩基础的大型化、装配化及智能化提出研究方向；在海洋桥梁的斜拉桥及悬索桥上部结构方面，就主塔、主梁及索束的结构形式及施工方法重点研究大节段制造运输、自动调整对位安装、结构抗风措施等；在智慧建造方面，提出结合信息化平台及可视化装备进行综合应用性研究。

关键词：海洋桥梁设置基础沉井大直径钢桩斜拉桥悬索桥智能化建筑信息模型技术

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DX桩群桩承载性状的数值分析

张清林,陈立宏

《中国工程科学》 2012年第14卷第1期页码 51-59

摘要：

通过数值计算对不同桩间距的DX桩群桩进行了分析研究。结果表明：DX桩的群桩效应随着桩间距的减小而逐渐明显，间距为6倍桩径的群桩极限承载力是间距为3倍桩径的群桩极限承载力的1.32倍；群桩间距由3倍桩径增大为6倍桩径时，群桩效应系数由0.59增大为0.78；群桩间土体沉降的最大值发生在两扩盘中间位置处，且随着桩间距的增大而减小。

关键词： DX桩群桩沉降数值分析