考虑轴力的部分埋入群桩基础水平振动特性

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摘要在近海工程中，关于基础支撑体系的动力特性研究对于保证上部结构的稳定和安全发挥着极其重要的作用。基于欧拉–伯努利(Euler-Bernoulli)梁模型提出水平荷载和竖向荷载共同作用下，部分埋入单桩的水平振动模型，分析影响单桩阻抗和有效桩长的主要因素，指出现有理论存在的不足，并给予修正；从埋入比、波的入射角和轴力3个方面分析部分埋入桩的桩–桩相互作用现象；然后，基于叠加原理建立部分埋入群桩的简化计算方法，计算结果与完全埋入群桩理论精确解进行对比。通过参数讨论，发现轴力(N)、桩间距(s/d)和埋入比(L1/L2)对于部分埋入群桩水平振动特性有着显著的影响，工程设计应该予以重视。最后，利用本模型研究一海上风电场群桩基础的水平振动特性和群桩基础阻抗变化对于整体结构自振特性的影响，为工程设计提出建议。

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关键词 ：桩基工程, 部分埋入, 动力响应, 群桩

Abstract：For offshore engineering，dynamic characteristics of supporting system of foundation are extremely important for the stability and security of upper structures. Based on the Euler-Bernoulli beam model，transfer matrix method is used to establish lateral vibration model for the partially embedded single pile considering the coupling effect of lateral load and vertical load. The main influence factors for impedance and effective pile length are analyzed；and the shortages of existing theory are indicated and also amended. The pile-pile interaction is studied from three aspects，i.e. length ratio，wave incidence angle and axial force；and a simplified approach for calculating partially embedded pile groups is put forward on the basis of superposition theory. Furthermore，solutions of the proposed model are compared with theoretical results for fully embedded pile groups. Through the discussion of parameters，it is concluded that the axial force(N)，pile spacing(s/d) and length ratio(L1/L2) are very important for the lateral vibration properties of partially embedded pile groups，which cannot be ignored by designers. Finally，the introduced model is used to study the effects of lateral vibration properties of the pile groups for an offshore wind power plant and variation of impedance of the pile groups foundation on natural vibration characteristics of overall structure.

Key words： pile foundations partially embedded dynamic response pile groups

收稿日期: 2011-04-27

引用本文:

任青1，黄茂松2，3，韩东晓1. 考虑轴力的部分埋入群桩基础水平振动特性[J]. 岩石力学与工程学报, 2011, 30(9): 1932-1944.
REN Qing1，HUANG Maosong2，3，HAN Dongxiao1. LATERAL VIBRATION PROPERTIES OF PARTIALLY EMBEDDED PILE GROUPS FOUNDATION CONSIDERING AXIAL FORCES. , 2011, 30(9): 1932-1944.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I9/1932

[1]	American Petroleum Institute. API-RP2A recommended practice for planning，designing and constructing fixed offshore platforms[S]. Washington：[s. n.]，2000. " target="_blank">
[3]	NOVAK M，SHETA M. Dynamic response of piles and pile groups[C]// Proceedings of the 2nd International Conference on Numerical Methods for Offshore Piling. Austin：[s. n.]，1982：1-18. " target="_blank">
[4]	PAK R Y S. Dynamic response of a partially embedded bar under transverse excitations[R]. California：California Institute of Technology，1985. " target="_blank">
[5]	LEE B K，JEONG J S，FAN L G，et al. Free vibrations of tapered piles embedded partially in Winkler type foundations[J]. KSCE Journal of Civil Engineering，1999，3(2)：195-203. " target="_blank">
[6]	BUDKOWSKA B B，SZYMCZAK C. Partially embedded piles subjected to critical buckling load—sensitivity analysis[J]. Computers and Structures，1996，61(1)：193-196. " target="_blank">
[7]	BUDKOWSKA B B，SZYMCZAK C. Initial post-buckling behavior of piles partially embedded in soil[J]. Computers and Structures，1997，62(5)：831-835. " target="_blank">
[9]	CATAL H H. Free vibration of semi-rigid connected and partially embedded piles with the effects of the bending moment，axial and shear force[J]. Engineering Structures，2006，28(14)：1 911-1 918. " target="_blank">
[10]	HUGHES D，RAMEY G E，HUGHES M L. Bridge pile bent number of piles and X-bracing system：impact on pushover capacity as scour increases[J]. Practice Periodical on Structural Design and Construction，2007，12(2)：82-95. " target="_blank">
[14]	RANDOLPH M F，WROTH C P. Analysis of deformation of vertically loaded piles[J]. Journal of the Geotechnical Engineering Division，ASCE，1978，104(12)：1 465-1 488. " target="_blank">
[8]	CATAL H H. Free vibration of partially supported piles with the effects of bending moment，axial and shear force[J]. Engineering Structures，2002，24(12)：1 615-1 622. " target="_blank">
[11]	FERDOUS M R. Pile capacity utilization for bridge bents designed using simplified procedures[M. S. Thesis][D]. Baton Rouge：Louisiana State University，2007. " target="_blank">
[2]	American Association of State Highway and Transportation Officials. LRFD bridge design specifications[S]. Washington：[s. n.]，2008. " target="_blank">
[12]	GAZETAS G，DOBRY R. Horizontal response of piles in layered soils[J]. Journal of Geotechnical Engineering，ASCE，1984，110(1)：20-40. " target="_blank">
[15]	KAYNIA A M，KAUSEL E. Dynamic stiffness and seismic response of pile groups[R]. Cambridge：Department of Civil Engineering，MIT，1982. " target="_blank">
[16]	中华人民共和国行业标准编写组. JGJ94—2008建筑桩基技术规范[S]. 北京：中国建筑工业出版社，2008.(The Professional Standards Compilation Group of People?s Republic of China. JGJ94—2008 Technical code for building pile foundations[S]. Beijing：China Architecture and Building Press，2008.(in Chinese)) " target="_blank">
[13]	MAKRIS N，GAZETAS G. Dynamic soil-pile interaction. part II：lateral and seismic response[J]. Earthquake Engineering and Structural Dynamics，1992，21(2)：145-162. " target="_blank">