径向软化成层土中单桩风机水平振动特性研究

PDF(1454 KB)

振动与冲击 ›› 2021, Vol. 40 ›› Issue (11) : 86-93.

论文

王腾1，王婵2

作者信息 +

Horizontal vibration characteristics of monopile wind turbine in radial softening layered soil

WANG Teng1, WANG Chan2

Author information +

文章历史 +

摘要

基于多圈层平面应变土体水平振动模型，得到桩周土体径向软化水平动刚度的解析解。在此基础上，建立径向非均质成层土中桩基水平振动模型，利用传递矩阵法得到桩顶动刚度阵，采用等效固定梁模型将桩土系统耦合到风机仿真软件FAST 8中，对桩周土径向软化对风、波浪荷载作用下单桩风机水平动力响应的影响进行研究。结果表明：桩周土软化对桩顶动刚度影响显著，当土体模量衰减系数为0.25时，与均质土相比桩顶水平刚度降低28.66%；随桩周土模量衰减系数的减小，与均质土相比风机系统的1阶和2阶自振频率分别降低13.08%和16.67%；风机塔顶位移、转角的时程和谱响应表明桩周土土体模量衰减系数为0.25时，塔顶位移和转角的方差与均质土分别相差2.68%和1.37%，位移和转角响应谱峰值约为均质土的2.77倍和2.69倍。

Abstract

Based on the multi-circle layer plane strain soil horizontal vibration model, the analytical solution to horizontal dynamic stiffness of radial softening soil around pile was obtained.Then, the horizontal vibration model of pile foundation in radial heterogeneous layered soil was established, and the dynamic stiffness matrix of pile top was obtained using the transfer matrix method.Furthermore, the equivalent fixed beam model was used to couple a pile-soil system into the wind turbine simulation software FAST 8 Effects of radial softening soil around pile on the horizontal dynamic response of monopile wind turbine under wind and wave loads were studied.The results showed that softening of soil around pile significantly affects dynamic stiffness of pile top; when the soil modulus attenuation coefficient is 0.25, horizontal stiffness of pile top decreases by 28.66% compared with that in case of homogeneous soil; with decrease in soil modulus attenuation coefficient, the first and second order natural frequencies of the wind turbine system decrease by 13.08% and 16.67%, respectively compared with those in case of homogeneous soil; when the soil modulus attenuation coefficient is 0.25, variances of wind turbine tower top’s displacement and rotation angle time histories have differences of 2.68% and 1.37%, respectively compared with those in case of homogeneous soil, while peak values of displacement and rotation angle response spectra are about 2.77 and 2.69 times, respectively of those in case of homogeneous soil.

导出引用

王腾1，王婵2 . 径向软化成层土中单桩风机水平振动特性研究[J]. 振动与冲击, 2021, 40(11): 86-93

WANG Teng1, WANG Chan2. Horizontal vibration characteristics of monopile wind turbine in radial softening layered soil[J]. Journal of Vibration and Shock, 2021, 40(11): 86-93

参考文献

［1］盛振国，任慧龙，甄春博，等.桩土参数对海上风机基础结构动力特性的影响分析［J］.武汉理工大学学报，2014，36(4):73-79.
SHENG Zhenguo, REN Huilong, ZHEN Chunbo, et al.Impact research of soil and structural parameters arameters on dynamic response of offshore wind turbine［J］.Jouranal of Wuhan University of Technology, 2014, 36(4): 73-79.
［2］刘红军，尹燕京，常季青.水平荷载下海上风机单桩基础桩土相互作用研究［J］.中国海洋大学学报，2016，46（3）：113-120.
LIU Hongjun, YIN Yanjing, CHANG Jiqing.Research on the pile-soil interaction of monopile foundation under horizontal load for offshore wind turbine［J］.Periodical of Ocean University of China, 2016, 46(3): 113-120.
［3］黄茂松，钟锐.海上风机部分埋入群桩水平-摇摆振动与结构共振分析［J］.岩土工程学报，2014，36(2)：286-294.
HUANG Maosong, ZHONG Rui.Coupled horizontal-rocking vibration of partially embedded pile groups and its effect on resonance of offshore wind turbine structures［J］.Chinese Journal of Geotechnical Engineering, 2014, 36(2): 286-294.
［4］NOVAK M, NOGAMI T, ABOUL-ELLA F.Dynamic soil reactions for plane strain case［J］.Journal of Engineering Mechanics, 1978(104): 953-959.
［5］KOTEN H V, MIDDENDORP P, BREDERODE P V.An anslysis of dissipative wave propagation in a pile［C］//Seminar on the Application of Stress-Wave Theory on Piles.Rotterdam: Stockholm.A.A.Balkema, 1980.
［6］王奎华，阙仁波，夏建中.考虑土体真三维波动效应时桩的振动理论及近似理论的校核［J］.岩土力学与工程学报，2005，24(8):1362-1370.
WANG Kuihua, QUE Renbo, XIA Jianzhong.Theory of pile vibration considering true three-dimensional wave effect of soil and its check on the approximate theories［J］.Chinese Journal of Rock Mechanics Engineering, 2005, 24(8): 1362-1370.
［7］杨冬英，王奎华.任意圈层径向非均质土中桩的纵向振动特性［J］.力学学报，2009, 41(2)：243-252.
YANG Dongying, WANG Kuihua.Vertical vibration of pile in radilally inhomogenous soil layers［J］.Journal of Theoretical and Applied Mechanics, 2009, 41(2): 243-252.
［8］NOVAK M, SHETA M.Approximate approach to contact problems of piles［C］//American Society of Civil Engineering National Convention.Florida: ASCE, 1980.
［9］EL NAGGAR M H.Vertical and torsional impedances for radially inhomogeneous soil media［R］.London: Geotechnical Research Centre, the University of Western Ontario, 1996.
［10］NOVAK M, HAN Y C.Impedances of soil layer with disturbed boundary zone［J］.Journal of Geotechnical Engineering, 1990, 116(6): 1008-1014.
［11］DOTSON K W, VELETSOS A S.Vertical and torsional impedances for radially inhomogeneous viscoelastic soil layer［J］.Journal of Soil Dynamics and Earthquake Engineering, 1990, 9(3): 110-119.
［12］HAN Y C, SABIN G C W.Impedances for radially inhomogeneous viscoelastic soil media［J］.Journal of Engineering Mechanics, 1995, 121(9): 939-947.
［13］EL NAGGAR M H.Horizontal and rotational impedances for radially inhomogeneous soil media［J］. Canadian Geotechnical Journal, 1997, 34(3): 408-420.
［14］SHAHMOHAMMADI A, SHABAKHTY N.Pile apparent fixity length estimation for the jacket-type offshore wind turbines under lateral loads applicable to fatigue analysis［J］.International Journal of Coastal and Offshore Engineering, 2020, 3(4): 25-33.
［15］LOKEN I B.Dynamic response and fatigue of offshore wind turbines［D］.Trondheim: Norwegian University of Science and Technology, 2017.
［16］NOVAK M.Dynamic soil reaction for plane strain case［J］.Journal of Engineering Mechanics Division, 1978, 104(4): 953-959.
［17］范小雪，李原，吴文兵，等．饱和土中大直径缺陷桩水平振动响应研究［J］．岩石力学与工程学报，2020，39(2): 413-423.
FAN Xiaoxue, LI Yuan, WU Wenbing, et al.Horizontal vibration response of defective large-diameter pile embedded in saturated soil［J］.Chinese Journal of Rock Mechanics Engineering, 2020,39(2):413-423.
［18］GUSTAVO E.Dynamic lateral response of single piles considering soil inertia contribution［D］.Puerto Rico: University of Puerto Rico, 2007.
［19］PASSON P.Derivation and description of the soil-pile-interaction models technical report［R］.Stuttagrt: University of Stuttgart, 2006.
［20］JONKMAN J, BUTTERFIELD S, MUSIAL W, et al.Definition of a 5-MW reference wind turbine for offshore system development［R］.Golden, CO: National Renewable Energy Lab.(NREL), 2009.