考虑应力历史的冲刷对沉箱加桩复合基础水平振动特性影响研究

doi:10.16285/j.rsm.2016.09.019

›› 2016, Vol. 37 ›› Issue (9): 2577-2584.doi: 10.16285/j.rsm.2016.09.019

考虑应力历史的冲刷对沉箱加桩复合基础水平振动特性影响研究

涂文博^{1, 2}，黄茂松^{1, 2}，钟锐^{1, 2}

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

收稿日期:2014-10-27 出版日期:2016-09-12 发布日期:2018-06-09
通讯作者: 黄茂松，男，1965年生，博士，教授，博士生导师，从事岩土工程方面的教学与研究工作。E-mail: mshuang@tongji.edu.com E-mail: 2013tuwenbo@tongji.edu.cn
作者简介:涂文博，男，1989年生，博士研究生，主要从事土动力学方面的研究工作。
基金资助:
国家基础重点基础研究发展计划（973项目）（No.2013CB036304）；国家自然科学基金项目（No.91315301）。

Scouring effects on lateral vibration of caisson-piles composite foundation considering stress history of sand

TU Wen-bo^{1, 2}, HUANG Mao-song^{1, 2}, ZHONG Rui^{1, 2}

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

Received:2014-10-27 Online:2016-09-12 Published:2018-06-09
Supported by:
This work was supported by the Key Basic Research Project of China (973 Program) (2013CB036304) and the National Natural Science Foundation of China (91315301).

摘要/Abstract

摘要： 水流的冲刷效应会导致桩身周围土体的减少及土体应力状态的改变，而对沉箱加桩复合基础的动力特性产生显著的影响。提出了动力Winkler模型，建立了沉箱加桩复合基础受冲刷后考虑应力历史改变影响的动力阻抗计算方法，并通过与海绵边界动力有限元方法的对比，验证了其合理性。对沉箱加桩复合基础工程实例计算结果表明，冲刷对复合基础的动刚度及阻尼有比较显著的影响，且随着冲刷深度的加大，影响更为显著。仅考虑基础侧向土体的减少是不够的，应力历史的改变还会进一步弱化基础承载特性，从而放大结构动力响应，对忽略土体应力历史改变而计算的动力阻抗值是相对偏大的，且应力历史的改变会明显增加基础的共振幅值，但对共振频率大小无明显影响。

关键词: 冲刷, 动力阻抗, 应力历史, 沉箱加桩复合基础

Abstract: Scouring effect has a significant impact on the lateral vibration of caisson-piles composite foundation because of the change in stress history and the reduction of soils around the foundation. Based on the dynamic Winkler model proposed by author, a computational method of the dynamic impedance of caisson-piles composite foundation influenced by scouring effect with considering stress history is developed. Then sponge boundary dynamic FEM are used to validate the theoretical results. Finally, the proposed procedure is used to analyze a practical engineering. The results show that scouring effect has a significant impact on the dynamic stiffness and damping coefficient, and the more scour depth increased, the more remarkable influence on the results. This implies that it is not enough to only consider the loss of soil around the composite foundation for scouring effect, the change of stress history can further weaken bearing capacity of composite foundation and enlarge the dynamic response of structure, thus ignoring the change of stress history will result in an overestimate of value of dynamic impedance, and the change of stress history accompany with an apparent increase in amplitude of resonant response of composite foundation, while it has no effect on the value of resonant frequency.

Key words: scouring, dynamic impedance, stress history, caisson-piles composite foundation

中图分类号:

TU 470

涂文博，黄茂松，钟锐, . 考虑应力历史的冲刷对沉箱加桩复合基础水平振动特性影响研究[J]. , 2016, 37(9): 2577-2584.

TU Wen-bo, HUANG Mao-song, ZHONG Rui, . Scouring effects on lateral vibration of caisson-piles composite foundation considering stress history of sand[J]. , 2016, 37(9): 2577-2584.

参考文献

相关文章 15

[1]	安笑, 潘华利, 欧国强, 孔玲, 李炳志, . 恒定渗流作用泥石流碎屑物质起动判别模型研究[J]. 岩土力学, 2020, 41(S1): 115-122.
[2]	崔春义, 孟坤, 武亚军, 马科研, 梁志孟, . 轴对称径向非均质土中单桩纵向振动特性研究[J]. 岩土力学, 2019, 40(2): 570-579.
[3]	周翠英, 赵珊珊, 杨旭, 刘镇, . 生态酯类材料砂土改良及工程护坡应用[J]. 岩土力学, 2019, 40(12): 4828-4837.
[4]	孟坤, 崔春义, 许成顺, 梁志孟, 杨刚, . 基于虚土桩模型的三维饱和介质中浮承桩纵向振动特性分析[J]. 岩土力学, 2019, 40(11): 4313-4323.
[5]	刘红军，杨奇，. 局部冲刷对风机支撑系统承载性能的影响[J]. , 2018, 39(2): 722-727.
[6]	张瑞刚，许光祥，王林峰，康海，苏丽梅，刘丽,. 洪水致弯曲河道挡墙稳定性衰变[J]. , 2018, 39(1): 63-70.
[7]	陈柏麟，郭力纶，张达德. 水压计用于河床冲刷的实时监测研究[J]. , 2017, 38(8): 2448-2455.
[8]	刘林超，闫启方，闫盼. 考虑三维波动的饱和土中管桩群桩的水平振动研究[J]. , 2017, 38(10): 2817-2825.
[9]	李传勋，徐超，谢康和，. 考虑非达西渗流和应力历史的土体非线性固结研究[J]. , 2017, 38(1): 91-100.
[10]	刘飞禹，王攀，王军，蔡袁强,. 颗粒粒径对格栅-土界面静、动力直剪特性的影响[J]. , 2017, 38(1): 150-156.
[11]	陈群，彭君，朱分清，. 砂砾石与砂接触冲刷试验研究[J]. , 2016, 37(S1): 295-300.
[12]	于通顺，练继建，齐越，王鸿振，. 复合筒型风电基础单向流局部冲刷试验研究[J]. , 2015, 36(4): 1015-1020.
[13]	何泓男，戴国亮，杨炎华，龚维明 , 代浩 , . 局部冲刷下群桩水平承载试验研究[J]. , 2015, 36(10): 2939-2945.
[14]	杨晓峰，张陈蓉，袁聚云 , . 砂土中考虑冲刷的水平受荷桩等效应变楔方法[J]. , 2015, 36(10): 2946-2950.
[15]	盛志强，滕延京. 考虑应力历史的饱和土抗剪强度测试方法探讨[J]. , 2014, 35(S2): 107-113.

Metrics

Viewed

Full text

Abstract

Cited

Shared

Discussed

考虑应力历史的冲刷对沉箱加桩复合基础水平振动特性影响研究

Scouring effects on lateral vibration of caisson-piles composite foundation considering stress history of sand

PDF (Chinese)

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

Metrics

本文评价

推荐阅读 0