涌潮作用下桩式丁坝横向动力特性现场试验及数值分析
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摘要
结合在钱塘江盐官河段对涌潮作用下桩式丁坝动力特性进行的现场测试,首次将有限差分法应用于求解桩式丁坝框架结构受涌潮瞬态荷载作用时的动力响应。其桩周土模型采用Winkler假定,应用有限差分法将桩式丁坝框架结构的各梁柱单元离散后联立起来,从而求得整个结构的动力响应。通过参数研究揭示了结构的形式、结构的刚度、土的剪切波速(即反映桩土相对刚度)对桩式丁坝框架结构横向振动的影响。通过与现场测试结果比较可知,理论计算值与实测值基本吻合,验证了该方法的精度和稳定性。该方法计算过程简单,克服了传统的静力法不能考虑结构的惯性力以及土的粘滞阻尼和动刚度的缺点,对工程实际具有一定的指导意义。
Following the field test of transversal dynamic characteristics of pile groins due to bores in the Yanguan reach of the Qian-tang river,finite difference method was used for the dynamic response analysis of the sheet-pile groin frame structure under transient excitation due to tidal bores at the first time.Adopting Winkler model for soils,the dynamic response of the whole structure was obtained by means of finite difference method.Parameter studies revealed the influences of the structural style,the rigidity of the structure and the shearing wave velocity(reflecting the pile-soil stiffness ratio).Good agreement between the field test and the theoretical analysis validates the present approach.The traditional static method could not consider the inertial force of the structure,the dynamic stiffness and the viscous damping of the soil.The present approach overcomes above disadvantages,and has a simple calculation process,therefore,the conclusions may be meaningful to engineering practice to a certain extent.
Following the field test of transversal dynamic characteristics of pile groins due to bores in the Yanguan reach of the Qian-tang river,finite difference method was used for the dynamic response analysis of the sheet-pile groin frame structure under transient excitation due to tidal bores at the first time.Adopting Winkler model for soils,the dynamic response of the whole structure was obtained by means of finite difference method.Parameter studies revealed the influences of the structural style,the rigidity of the structure and the shearing wave velocity(reflecting the pile-soil stiffness ratio).Good agreement between the field test and the theoretical analysis validates the present approach.The traditional static method could not consider the inertial force of the structure,the dynamic stiffness and the viscous damping of the soil.The present approach overcomes above disadvantages,and has a simple calculation process,therefore,the conclusions may be meaningful to engineering practice to a certain extent.
引文
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[4]邵卫云,毛根海,等.钱塘江涌潮压力的分析与研究[J].水动力学研究与进展,2002,17(5):604-610.
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[6]朱军政,林炳尧.涌潮翻越丁坝过程数值试验初步研究[J].水动力学研究与进展,2003,18(6):671-678.
[7]赵振东,傅铁铭,土岐宪三.桩头侧向集中荷载作用下桩-土系统的非线性动力性能分析[J].地震工程与工程振动,1997,17(3):100-108.
[8]Mamoon S M,Banerjee P K.Time-domain analysis of dynamically loaded single piles[J].Journal of Engineering Mechanics,ASCE,1992,118(1):140-160.
[9]Novak M.Dynamic stiffness and damping of piles[J].Canadian Geotechnical Journal,1974,11(4):574-598.
[10]Milos Novak,Toyoaki Nogami.Dynamic soil reactions for plane strain case[J].Journal of the Engineering Mechanics Division,AS-CE,1978,104(EM4):953-959.
[11]Milos Novak,Fakhry Aboul-Ella.Impedance functions of piles in layered media[J].Journal of the Enginee-ring Mechanics Division,ASCE,1978,104(EM3):643-661.
[12]刘东甲,王建国.瞬态横向振动桩的Winkler参数[J].岩土力学,2003,24(6):922-926.
[13]刘东甲,王建国.均匀土中有限长桩瞬态横向动力响应[J].工程力学,2003,20(6):160-165.
[14]Barden L.Stress and displacements in a cross-anisotropic soil[J].Geotehnique,1963,13(3):198-210.
[15]Barden L.The Winkler model and its application soil[J].Structure Engineering,1963,41(9):279-280.
[16]陈海军,徐长节,蔡袁强.涌潮冲击桩式丁坝的数值模拟[J].浙江大学学报(工学版).
[2]陈希海,庄娟芳.钱塘江海塘织物模袋混凝土护坦涌潮压力测试与分析[J].浙江水利科技,1989,(4):33-38.
[3]邵卫云,毛根海,等.钱塘江涌潮压力的动态测试与分析研究[J].浙江大学学报(工学版),2002,36(3):247-251.
[4]邵卫云,毛根海,等.钱塘江涌潮压力的分析与研究[J].水动力学研究与进展,2002,17(5):604-610.
[5]林炳尧,潘存鸿,黄世昌.钱塘江涌潮数值模拟的探讨[J].河口与海岸工程,1996,9(2):23-30.
[6]朱军政,林炳尧.涌潮翻越丁坝过程数值试验初步研究[J].水动力学研究与进展,2003,18(6):671-678.
[7]赵振东,傅铁铭,土岐宪三.桩头侧向集中荷载作用下桩-土系统的非线性动力性能分析[J].地震工程与工程振动,1997,17(3):100-108.
[8]Mamoon S M,Banerjee P K.Time-domain analysis of dynamically loaded single piles[J].Journal of Engineering Mechanics,ASCE,1992,118(1):140-160.
[9]Novak M.Dynamic stiffness and damping of piles[J].Canadian Geotechnical Journal,1974,11(4):574-598.
[10]Milos Novak,Toyoaki Nogami.Dynamic soil reactions for plane strain case[J].Journal of the Engineering Mechanics Division,AS-CE,1978,104(EM4):953-959.
[11]Milos Novak,Fakhry Aboul-Ella.Impedance functions of piles in layered media[J].Journal of the Enginee-ring Mechanics Division,ASCE,1978,104(EM3):643-661.
[12]刘东甲,王建国.瞬态横向振动桩的Winkler参数[J].岩土力学,2003,24(6):922-926.
[13]刘东甲,王建国.均匀土中有限长桩瞬态横向动力响应[J].工程力学,2003,20(6):160-165.
[14]Barden L.Stress and displacements in a cross-anisotropic soil[J].Geotehnique,1963,13(3):198-210.
[15]Barden L.The Winkler model and its application soil[J].Structure Engineering,1963,41(9):279-280.
[16]陈海军,徐长节,蔡袁强.涌潮冲击桩式丁坝的数值模拟[J].浙江大学学报(工学版).
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