锤击荷载作用下大直径钢管群桩的动力特性分析

冯世进; 王雷

doi:10.11779/CJGE201701011

锤击荷载作用下大直径钢管群桩的动力特性分析 English Version

冯世进^{1, 2},
王雷¹

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

详细信息

作者简介:
冯世进(1978-),男,博士,教授,博士生导师,主要研究方向为环境岩土工程和土动力学。E-mail: fsjgly@tongji.edu.cn。

计量
- 文章访问数: 0338
- HTML全文浏览量: 0
- PDF下载量: 0292
出版历程
- 收稿日期: 2015-11-08
- 发布日期: 2017-01-24

Dynamic response analysis of a large-diameter steel tube pile group subjected to hammering loads

FENG Shi-jin^{1, 2},
WANG Lei¹

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. Key Laboratory of Geotechnical and Underground of Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 上海某机械厂有一大直径钢管桩,用于所生产柴油打桩锤出厂前的试用。目前试桩已不满足新生产大吨位柴油打桩锤的试打要求,因此拟增加8根短桩与试桩组成群桩。由于锤击荷载作用下长短组合群桩中荷载的分配及沉降的研究较少,为得到合理的群桩加固型式,采用有限元方法研究锤击荷载作用下群桩的动力承载特性。首先建立单桩有限元模型,分析竖向静荷载作用下钢管桩的沉降,并将模拟结果与现场静荷载试验结果进行对比,验证有限元模型的准确性,再分析锤击荷载作用下单桩的动力响应;其次建立锤击荷载作用下的长短组合群桩有限元模型,分析承台质量、承台埋深、辅桩桩长对群桩桩顶荷载分布及沉降的影响。结果表明锤击荷载作用过程中,角桩、边桩桩顶最大压应力较大,主桩桩顶最大压应力较小;承台埋深越浅,群桩桩顶应力越大,沉降反而越小;承台质量、辅桩桩长对群桩动力特性影响不大。
- 锤击荷载 /
- 钢管桩 /
- 群桩 /
- 数值模拟
Abstract: A large-diameter steel tube pile is used in a machinery factory in Shanghai to test the new produced diesel pile hammer. However, with the increase of the diesel hammer weight, it fails to meet the test requirements and a pile group is recommended to bear the hammering loads with the help of 8 added short piles. But so far, few people have investigated the displacement and load distribution of combined pile groups subjected to hammering loads. To reasonably design the reinforcement type of the pile group, the finite element method is used to study its dynamic responses. Firstly, a three-dimensional single pile model is established and verified through static load tests. The dynamic responses of the pile group are then simulated to evaluate the effects of the mass and depth of pile cap, the length of short piles on its settlement and load distribution. The results show that the maximum compressive stress of corner piles and edge piles are larger than that at the top of the main pile during the impact of hammering loads. For a shallower pile cap, the stress of the main pile head tends to be larger while the settlement of the main pile is smaller. Additionally, the mass of pile cap and the length of short piles have little effects on the dynamic properties of the pile group.
- hammering load /
- steel tube pile /
- pile group /
- numerical simulation

HTML全文

参考文献(14)

[1]	蒯行成, 任毕乔. 动荷载作用下群桩桩顶的荷载分布[J]. 湖南大学学报(自然科学版), 2002, 29(4): 55-59. (KUAI Xing-cheng, REN Bi-qiao. Load distribution at the pile tops in pile groups under dynamic loads[J]. Journal of Hunan University (Natural Sciences), 2002, 29(4): 55-59. (in Chinese))
[2]	XU B, LU J, WANG J. Dynamic responses of pile groups embedded in a layered poroelastic half-space to harmonic axial loads[J]. Journal of Vibration and Acoustics, 2011, 133(2): 1-10.
[3]	LIU H L, ZHENG C J, DING X M, et al. Vertical dynamic response of a pipe pile in saturated soil layer[J]. Computers and Geotechnics, 2014, 61: 57-66.
[4]	DING X M, LIU H L, KONG G Q, et al. Time-domain analysis of velocity waves in a pipe pile due to a transient point load[J]. Computers and Geotechnics, 2014, 58: 101-116.
[5]	朱合华, 谢永健, 王怀忠. 打桩锤击解析模型及垫层材料参数的优化[J]. 同济大学学报(自然科学版), 2004, 32(7): 841-845. (ZHU He-hua, XIE Yong-jian, WANG Huai-zhong. Analytical solution for pile hammer impact and application of optimum design technique for determining cushion parameters[J]. Journal of Tongji University (Natural Science), 2004, 32(7): 841-845. (in Chinese))
[6]	曾友金, 章为民, 王年香, 等. 某大型哑铃型承台群桩基础与土体共同作用竖向承载变形特性数值模拟分析[J]. 岩土工程学报, 2005, 27(10): 1129-1135. (ZENG You-jin, ZHANG Wei-min, WANG Nian-xiang, et al. Numerical analysis of interaction between group piles and dumbbell shaped cap in a super large bridge[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(10): 1129-1135. (in Chinese))
[7]	蒯行成, 田建华. 低承台群桩动力阻抗的有限元分析[J]. 湖南大学学报(自然科学版), 2004, 31(4): 55-59. (KUAI Xing-cheng, TIAN Jian-hua. Finite element analysis of dynamic impedances of pile groups with embedded caps[J]. Journal of Hunan University (Natural Sciences), 2004, 31(4): 55-59. (in Chinese))
[8]	左殿军, 陈龙, 田志伟, 等. 双向循环荷载作用下码头群桩基础受力特性数值分析[J]. 岩土工程学报, 2015, 37(增刊1): 51-55. (ZUO Dian-jun, CHEN Long, TIAN Zhi-wei, et al. Numerical study on mechanical characteristics of pile groups of wharf foundation under lateral and vertical cyclic loadings[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(S1): 51-55. (in Chinese))
[9]	邢皓枫, 李浩铭, 安新, 等. 超大直径嵌岩桩受力特性的数值模拟及其规律性分析[J]. 岩土工程学报, 2013, 35(增刊2): 1126-1129. (XING Hao-feng, LI Hao-ming, AN Xin, et al. Numerical simulation and analysis of mechanical characteristics for large-diameter rock-socketed piles[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(S2): 1126-1129. (in Chinese))
[10]	谢涛, 袁文忠, 朱明. 竖向荷载下超大群桩受力变形分析[J]. 西南交通大学学报, 2002, 27(4): 377-381. (XIE Tao, YUAN Wen-zhong, ZHU Ming. The deformation behavior of super-large pile group under vertical load[J]. Journal of Southwest Jiaotong University, 2002, 27(4): 377-381. (in Chinese))
[11]	熊辉, 邹银生, 蒋建国. 基于上下部共同作用的群桩动力优化设计[J]. 岩土工程学报, 2003, 25(5): 590-594. (XIONG Hui, ZOU Yin-sheng, JIANG Jian-guo. Dynamic optimizing design of pile-groups considering interaction on upper and lower parts[J]. Chinese Journal of Geotechnical Engineering, 2003, 25(5): 590-594. (in Chinese))
[12]	秋仁东, 刘金砺, 高文生, 等. 群桩基础沉降计算中的若干问题[J]. 岩土工程学报, 2011, 33(增刊2): 15-23. (QIU Ren-dong, LIU Jin-li, GAO Wen-sheng, et al. Some problems on settlement calculation of pipe group foundation[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(S2): 15-23. (in Chinese))
[13]	江杰, 黄茂松, 顾倩燕. 非均质地基中群桩竖向荷载沉降关系分析[J]. 岩土力学, 2008, 29(8): 2092-2096. (JIANG Jie, HUANG Mao-song, GU Qian-yan. Analysis of settlements of vertically loaded pile groups in non-homogeneous soil[J]. Rock and Soil Mechanics, 2008, 29(8): 2092-2096. (in Chinese))
[14]	史佩栋, 刘金砺. 实用桩基工程手册[M]. 北京: 中国建筑工业出版社, 1997. (SHI Pei-dong, LIU Jin-li. Practical handbook of pile foundation[M]. Beijing: China Architecture and Building Press, 1997. (in Chinese))

施引文献

资源附件(0)

计量

文章访问数:
HTML全文浏览量: 0
PDF下载量:
被引次数: 0

锤击荷载作用下大直径钢管群桩的动力特性分析 English Version

作者简介: 冯世进(1978-),男,博士,教授,博士生导师,主要研究方向为环境岩土工程和土动力学。E-mail: fsjgly@tongji.edu.cn。

计量

出版历程

Dynamic response analysis of a large-diameter steel tube pile group subjected to hammering loads

计量

出版历程

目录

作者简介:
冯世进(1978-),男,博士,教授,博士生导师,主要研究方向为环境岩土工程和土动力学。E-mail: fsjgly@tongji.edu.cn。