大直径单桩水平循环弱化有限元分析
|
摘要
处于复杂海洋环境下的大直径单桩基础需要承受波流等长期水平循环荷载作用,建立能反映其循环弱化特性的有限元分析方法尤为重要。为此,采用非线性运动硬化准则和饱和软黏土循环弱化模型描述土体循环加载时的滞回特性和强度弱化,并建议了模型参数的选取方法。为验证该本构模型在分析桩土循环弱化时的有效性,先将大直径单桩循环加载有限元模拟结果与离心试验结果进行对比。并进一步研究了循环位移幅值、弱化参数对于大直径单桩基础桩顶反力弱化的影响。
monopile foundation under complex marine environment is always subjected to longterm cyclic loads such as wave and currents.Therefore,it is necessary to establish a corresponding finite element analysis method.In this study,a nonlinear kinematic hardening criterion with cyclic degradation characteristic is employed to describe the cyclic hysteresis and softening characteristics of undrained soft clay.A method of determining the model parameters is recommended.By comparing the results from the centrifuge test of a cyclic lateral monopile with those from the finite element simulation,the effectiveness of the model is verified.Finally,parametric studies on the effect of the displacement cyclic amplitude and the softening parameter on the lateral resistance of the monopile are conducted.
monopile foundation under complex marine environment is always subjected to longterm cyclic loads such as wave and currents.Therefore,it is necessary to establish a corresponding finite element analysis method.In this study,a nonlinear kinematic hardening criterion with cyclic degradation characteristic is employed to describe the cyclic hysteresis and softening characteristics of undrained soft clay.A method of determining the model parameters is recommended.By comparing the results from the centrifuge test of a cyclic lateral monopile with those from the finite element simulation,the effectiveness of the model is verified.Finally,parametric studies on the effect of the displacement cyclic amplitude and the softening parameter on the lateral resistance of the monopile are conducted.
引文
[1]黄茂松,李进军,李兴照.饱和软黏土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.Huang M S,Li J J,Li X Zh.Cumulative deformation behaviour of soft clay in cyclic undrained tests[J].Chinese Journal of Geotechnical Engineering,2006,28(7):891-895.(in Chinese)
[2]Soroush A,Soltani-Jigheh H.Pre-and post-cyclic behavior of mixed clayey soils[J].Canadian Geotechnical Journal,2009,46(2):115-128.
[3]Andersen K H,Rosenbrand W F,Brown S F,et al.Cyclic and static laboratory tests on Drammen clay[J].Journal of the Geotechnical Engineering Division,1980,106(5):499-529.
[4]郭林,蔡袁强,王军,等.长期循环荷载作用下温州结构性软黏土的应变特性研究[J].岩土工程学报,2012,34(12):2 249-2 254.Guo L,Cai Y Q,Wang J,et al.Long-term cyclic strain behavior of Wenzhou structural soft clay[J].Chinese Journal of Geotechnical Engineering,2012,34(2):2 249-2 254.(in Chinese)
[5]刘明.饱和软粘土动力本构模型研究与地铁隧道长期振陷分析[D].上海:同济大学,2006.Liu M.Cyclic constitutive modeling of soft clays and long-term predictions of subway traffic-load-induced settlements[D].Shanghai:Tongji University,2006.(in Chinese)
[6]胡存,刘海笑,黄维.考虑循环载荷下饱和黏土软化的损伤边界面模型研究[J].岩土力学,2012,33(2):144-151.Hu C,Liu H X,Huang W.Damage-dependent bounding surface model for cyclic degradation of saturated clay[J].Rock and Soil Mechanics,2012,33(2):459-466.(in Chinese)
[7]Achmus M,Kuo Y S,Abdel-Rahman K.Behavior of monopile foundations under cyclic lateral load[J].Computers and Geotechnics,2009,36(2):725-735.
[8]Depina I,Le T M H,Eiksund G,et al.Behavior of cyclically loaded monopile foundations for offshore wind turbines in heterogeneous sands[J].Computers and Geotechnics,2015,65:266-277.
[9]Huang M S,Liu Y.Axial capacity degradation of single piles in soft clay under cyclic loading[J].Soils and Foundations,2015,55(2):315-328.
[10]黄茂松,刘莹.基于非线性运动硬化模型的饱和黏土桩基础竖向循环弱化数值分析[J].岩土工程学报,2014,36(12):2 170-2 178.Huang M S,Liu Y.Numerical analysis of axial cyclic degradation of a single pile in saturated soft soil based on nonlinear kinematic hardening constitutive model[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2 170-2 178.(in Chinese)
[11]Yu J,Leung C F,Huang M S,et al.Application of T-bar in numerical simulations of a monopile subjected to lateral cyclic load[J].Marine Georesources and Geotechnology,2018,36(6):643-651.
[12]Zhang Ch R,White D,Randolph M.Centrifuge modeling of the cyclic lateral response of a rigid pile in soft clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2011,137(7):717-729.
[13]Leblanc C,Houlsby G T,Byrne B W.Response of stiff piles in sand to long-term cyclic lateral loading[J].Géotechnique,2010,60(2):79-90.
[14]李卫超,杨敏,朱碧堂.砂土中刚性短桩的p-y模型案例研究[J].岩土力学,2015,36(10):2 989-2 995.Li W Ch,Yang M,Zhu B T.Case study of p-y model for short rigid pile in sand[J].Rock and Soil Mechanics,2015,36(10):2 989-2 995.(in Chinese)
[15]童冠丰,林小飞,代子幸.低应变法检测大直径短桩的技术探讨[J].建筑工程技术与设计,2015(11):204-205.Tong G F,Lin X F,Dai Z X.Discussion on the lowstrain method in the detection of large diameter short pile[J].Architectural Engineering Technology and Design,2015(11):204-205.(in Chinese)
[16]Tho K K,Leung C F,Chow Y K,et al.Eulerian finiteelement technique for analysis of jack-up spudcan penetration[J].International Journal of Geomechanics,2012,12(1):64-73.
[17]刘莹.饱和软黏土中桩基竖向承载力循环弱化特性[D].上海:同济大学,2014.Liu Y.Study on axial cyclic degradation of single pile in saturated soft soil[D].Shanghai:Tongji University,2014.(in Chinese)
[18]Bienen B,Gaudin C,Cassidy M J.The influence of pullout load on the efficiency of jetting during spudcan extraction[J].Applied Ocean Research,2009,31(3):202-211.
[19]Wood D M.Soil behaviour and critical state soil mechanics[M].London:Cambridge University Press,1990.
[2]Soroush A,Soltani-Jigheh H.Pre-and post-cyclic behavior of mixed clayey soils[J].Canadian Geotechnical Journal,2009,46(2):115-128.
[3]Andersen K H,Rosenbrand W F,Brown S F,et al.Cyclic and static laboratory tests on Drammen clay[J].Journal of the Geotechnical Engineering Division,1980,106(5):499-529.
[4]郭林,蔡袁强,王军,等.长期循环荷载作用下温州结构性软黏土的应变特性研究[J].岩土工程学报,2012,34(12):2 249-2 254.Guo L,Cai Y Q,Wang J,et al.Long-term cyclic strain behavior of Wenzhou structural soft clay[J].Chinese Journal of Geotechnical Engineering,2012,34(2):2 249-2 254.(in Chinese)
[5]刘明.饱和软粘土动力本构模型研究与地铁隧道长期振陷分析[D].上海:同济大学,2006.Liu M.Cyclic constitutive modeling of soft clays and long-term predictions of subway traffic-load-induced settlements[D].Shanghai:Tongji University,2006.(in Chinese)
[6]胡存,刘海笑,黄维.考虑循环载荷下饱和黏土软化的损伤边界面模型研究[J].岩土力学,2012,33(2):144-151.Hu C,Liu H X,Huang W.Damage-dependent bounding surface model for cyclic degradation of saturated clay[J].Rock and Soil Mechanics,2012,33(2):459-466.(in Chinese)
[7]Achmus M,Kuo Y S,Abdel-Rahman K.Behavior of monopile foundations under cyclic lateral load[J].Computers and Geotechnics,2009,36(2):725-735.
[8]Depina I,Le T M H,Eiksund G,et al.Behavior of cyclically loaded monopile foundations for offshore wind turbines in heterogeneous sands[J].Computers and Geotechnics,2015,65:266-277.
[9]Huang M S,Liu Y.Axial capacity degradation of single piles in soft clay under cyclic loading[J].Soils and Foundations,2015,55(2):315-328.
[10]黄茂松,刘莹.基于非线性运动硬化模型的饱和黏土桩基础竖向循环弱化数值分析[J].岩土工程学报,2014,36(12):2 170-2 178.Huang M S,Liu Y.Numerical analysis of axial cyclic degradation of a single pile in saturated soft soil based on nonlinear kinematic hardening constitutive model[J].Chinese Journal of Geotechnical Engineering,2014,36(12):2 170-2 178.(in Chinese)
[11]Yu J,Leung C F,Huang M S,et al.Application of T-bar in numerical simulations of a monopile subjected to lateral cyclic load[J].Marine Georesources and Geotechnology,2018,36(6):643-651.
[12]Zhang Ch R,White D,Randolph M.Centrifuge modeling of the cyclic lateral response of a rigid pile in soft clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2011,137(7):717-729.
[13]Leblanc C,Houlsby G T,Byrne B W.Response of stiff piles in sand to long-term cyclic lateral loading[J].Géotechnique,2010,60(2):79-90.
[14]李卫超,杨敏,朱碧堂.砂土中刚性短桩的p-y模型案例研究[J].岩土力学,2015,36(10):2 989-2 995.Li W Ch,Yang M,Zhu B T.Case study of p-y model for short rigid pile in sand[J].Rock and Soil Mechanics,2015,36(10):2 989-2 995.(in Chinese)
[15]童冠丰,林小飞,代子幸.低应变法检测大直径短桩的技术探讨[J].建筑工程技术与设计,2015(11):204-205.Tong G F,Lin X F,Dai Z X.Discussion on the lowstrain method in the detection of large diameter short pile[J].Architectural Engineering Technology and Design,2015(11):204-205.(in Chinese)
[16]Tho K K,Leung C F,Chow Y K,et al.Eulerian finiteelement technique for analysis of jack-up spudcan penetration[J].International Journal of Geomechanics,2012,12(1):64-73.
[17]刘莹.饱和软黏土中桩基竖向承载力循环弱化特性[D].上海:同济大学,2014.Liu Y.Study on axial cyclic degradation of single pile in saturated soft soil[D].Shanghai:Tongji University,2014.(in Chinese)
[18]Bienen B,Gaudin C,Cassidy M J.The influence of pullout load on the efficiency of jetting during spudcan extraction[J].Applied Ocean Research,2009,31(3):202-211.
[19]Wood D M.Soil behaviour and critical state soil mechanics[M].London:Cambridge University Press,1990.