超大直径嵌岩桩受力特性的数值模拟及其规律性分析

邢皓枫; 李浩铭; 安新; 李春峰

超大直径嵌岩桩受力特性的数值模拟及其规律性分析 English Version

邢皓枫^{1, 2},
李浩铭^{1, 2},
安新^{1, 2},
李春峰³

1. 同济大学地下建筑与工程系,上海 200092; 2. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 3. 贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳 550001

基金项目: 国家自然科学基金项目（41272292）

详细信息

作者简介:
邢皓枫(1969- )，男，河南开封人，博士，副教授，从事地基加固技术及桩基工程教学与研究工作。E-mail: hfxing@tongji.edu.cn。

中图分类号: TU473.1
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出版历程
- 收稿日期: 2013-06-14
- 发布日期: 2013-11-24

Numerical simulation and analysis of mechanical characteristics for large-diameter rock-socketed piles

XING Hao-feng^{1, 2},
LI Hao-ming^{1, 2},
AN Xin^{1, 2},
LI Chun-feng³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. Guizhou Transportation Planning Survey and Design Academy Co., Ltd., Guiyang 550001, China

摘要

摘要: 贵州赫章特大桥主墩高195 m,由20根直径2.5 m、长40 m的嵌岩桩支撑。桥区范围内地质条件较为复杂,为了掌握此复杂地质条件下嵌岩桩受力特性、桩侧阻和端阻分布及其变化规律,建立嵌岩桩单桩和群桩的三维有限元分析模型,开展超大直径嵌岩桩单、群桩的分析和研究,获得了一些有价值的结论：对于覆盖层深厚的超大直径嵌岩桩基础,覆盖层分担一定比例的桩顶荷载,若在设计中忽略覆盖层的影响是不经济的；嵌岩桩侧阻与端阻的发挥并非同步,即侧阻先于端阻发挥；合理的嵌岩深度有利于调动整个嵌岩段的侧阻发挥和提高端阻和覆盖层侧阻荷载分担比。
- 大直径嵌岩桩 /
- 岩石 /
- 覆盖层 /
- 三维数值模拟 /
- 受力特性
Abstract: The main pier of in Hezhang Bridge Guizhou province has a height of 195 m, which is supported by 20 rock-socketed piles with 2.5 m in diameter and 40 m in length. The engineering geological condition of the main pier site is very complex. In order to investigate its mechanical characteristics, end bearing and shaft resistance distribution, 3D finite element analyses for individual pile and pile group are carried out. Some valuable conclusions are drawn: the overlaying stratum shares a certain proportion of the upper load, so it is uneconomical to neglect its influence in design; the shaft resistance and tip resistance are not mobilized synchronously, the shaft resistance is mobilized prior to the tip resistance; the reasonable depth of rock-socketed piles can improve the shaft resistance and enhance the load sharing ratio of the tip resistance and the shaft resistance of the overlaying stratum.
- large-diameter rock-socketed pile /
- rock /
- overlaying stratum /
- 3D numerical simulation /
- mechanical characteristic

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参考文献(4)

[1]	张建新, 叶洪东, 等. 嵌岩桩设计中几个问题的探讨[J]. 岩石力学与工程学报, 2003, 22(7): 1222-1225. (ZHANG Jian-xin, YE Hong-dong, et al. Some problems in design of rock-socketed pile[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(7): 1222-1225. (in Chinese))
[2]	陈斌, 卓家寿, 吴天寿. 嵌岩桩承载性状的有限元分析[J]. 岩土工程学报, 2002, 24(1): 51-55. (CHEN Bin, ZHUO Jia-shou, WU Tian-shou. Vertical bearing capacity of rock- socketed piles[J]. Chinese Journal of Geotechnical Engineering, 2002, 24(1): 51-55. (in Chinese))
[3]	邱钰, 周琳, 刘松玉. 深长大直径嵌岩桩单桩承载性状的有限元分析[J]. 土木工程学报, 2003, 36(10): 95-101. (QIU Yu, ZHOU Lin, LIU Song-yu. Analysis for load-bearing characters of single large diameter, long socketed length pile, by finite element method[J]. China Civil Engineering Journal, 2003, 36(10): 95-101. (in Chinese))
[4]	黄生根, 张晓炜, 刘炜嶓. 大直径嵌岩桩承载性能的有限元模拟分析[J]. 岩土工程学报, 2011, 33(增刊2): 412-416. (HUANG Sheng-gen, ZHANG Xiao-wei, LIU Wei-bo. FEM analysis of bearing behavior of large-diameter socketed piles[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(S2): 412-416. (in Chinese))

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文章访问数: 328
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PDF下载量: 285
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超大直径嵌岩桩受力特性的数值模拟及其规律性分析 English Version

作者简介: 邢皓枫(1969- )，男，河南开封人，博士，副教授，从事地基加固技术及桩基工程教学与研究工作。E-mail: hfxing@tongji.edu.cn。

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出版历程

Numerical simulation and analysis of mechanical characteristics for large-diameter rock-socketed piles

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出版历程

目录

作者简介:
邢皓枫(1969- )，男，河南开封人，博士，副教授，从事地基加固技术及桩基工程教学与研究工作。E-mail: hfxing@tongji.edu.cn。