饱和土中桩-桩竖向动力相互作用及群桩竖向振动
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摘要
由于饱和土中孔隙水的流动特性以及桩基与土体的不同渗透率,饱和土与单相土中桩基的力学行为,尤其是动力学行为存在很大差异。运用Novak薄层法和引入势函数的方法,得到了饱和土层的竖向动力阻抗和自由场竖向位移衰减函数,在此基础上研究了饱和土中桩-桩的竖向动力相互作用及群桩的竖向动力阻抗问题。分析讨论了桩土力学参数对饱和土中群桩竖向动力阻抗的影响。研究表明:桩间距、液固耦合系数、桩土模量比等参数对桩-桩竖向相互作用和群桩竖向动力阻抗有影响,研究成果对于桩基动力检测和抗震设计具有较大的实际应用价值。
The mechanical properties,especially dynamic behaviors of the pile in saturated soil and single-phase soil are significantly different due to the flow quality of pore water in saturated soil and the difference in the porosity of soil and pile.The vertical impedance of saturated soil and the attenuation function of displacement of free field were obtained by using layer method and potential functions.The interaction of pile to pile and the vertical impedance of pile groups in saturated soil were investigated.The results indicated that the distance between piles,force factor of fluid phase and solid phase,modulus ratio of pile and soil affected vertical dynamic impedance of pile groups in saturated soil.The study of the pile in saturated soil provided significant help for dynamic inspection and design of pile.
The mechanical properties,especially dynamic behaviors of the pile in saturated soil and single-phase soil are significantly different due to the flow quality of pore water in saturated soil and the difference in the porosity of soil and pile.The vertical impedance of saturated soil and the attenuation function of displacement of free field were obtained by using layer method and potential functions.The interaction of pile to pile and the vertical impedance of pile groups in saturated soil were investigated.The results indicated that the distance between piles,force factor of fluid phase and solid phase,modulus ratio of pile and soil affected vertical dynamic impedance of pile groups in saturated soil.The study of the pile in saturated soil provided significant help for dynamic inspection and design of pile.
引文
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[10]周香莲,周光明,王建华.垂直受荷群桩在半空间饱和土中的稳态反应[J].计算力学学报,2005,22(5):598―602.Zhou Xianglian,Zhou Guangming,Wang Jianhua.Harmic response of pile groups subjected to vertical load in half space saturated soil[J].Chinese Journal of Computational Mechanics,2005,22(5):598―602.(in Chinese)
[11]周香莲,周光明,王建华.水平简谐荷载作用下饱和土中群桩的动力反应[J].岩石力学与工程学报,2005,24(8):1433―1438.Zhou Xianglian,Zhou Guangming,Wang Jianhua.Dynamic response of pile group in saturated soil Subjected to horizontal loads[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1433―1438.(in Chinese)
[12]Edelman I,Wilmanski K.Asymptotic analysis of surface waves at vacuum/porous medium and liquid/porous medium interfaces[J].Continuum Mech Thermody,2002,14:25―44.
[13]de Boer.Theory of porous media:Highlights in the historical development and current state[M].Berlin,Heidelberg:Springer-Verlag,2000.
[2]Kaynia A M,Kausel E.Dynamic stiffness and seismic response of pile groups[R].Research Report R82-03,Massachusetts Institute of technology,1982.
[3]Dobry R,Gazetas G.Simple method for dynamic stiffness and damping of floating pile groups[J].Geotechnique,1988,38(4):557―574.
[4]Gazetas G,Dobry R.Dynamic pile-soil-pile interaction.PartⅠ:analysis of axial vibration[J].Earthquake Engineering and Structure Dynamics,1991,20:115―132.
[5]Gazetas G,Fan K,Kaynai A.Dynamic response of pile groups with different configuration[J].Soi1Dynamics and Earthquake Engrg,1993,12:239―257.
[6]Mylonakis G,Gazetas G.Lateral vibration and internal forces of pile groups in layered soil[J].J Geotech-technical and Geoenvir on Metal Engrg,1999,125(1):16―25.
[7]蒯行成,沈蒲生.层状介质中群桩水平动力阻抗的简化计算方法[J].振动工程学报,1998,11(3):258―264.Kuai Xingcheng,Shen Pusheng.Simplified method for calculating horizontal dynamic impedances of pile groups in layered media[J].Journal of Vibration Engineering,1998,11(3):258―264.(in Chinese)
[8]Orlando Maeso,Juan J Aznarez,Fidel Garciá.Dynamic impedances of piles and groups of piles in saturated soils[J].Computer&Structures,2005,83:769―782.
[9]张玉红,黄义.二相介质饱和土中群桩动力阻抗分析[J].地震工程与工程振动,2001,21(3):113―116.Zhang Yuhong,Hang Yi.Dynamic impedance of group piles in two-phase fluid-saturated soils[J].Earthquake Engineering and Engineering Vibration,2001,21(3):113―116.(in Chinese)
[10]周香莲,周光明,王建华.垂直受荷群桩在半空间饱和土中的稳态反应[J].计算力学学报,2005,22(5):598―602.Zhou Xianglian,Zhou Guangming,Wang Jianhua.Harmic response of pile groups subjected to vertical load in half space saturated soil[J].Chinese Journal of Computational Mechanics,2005,22(5):598―602.(in Chinese)
[11]周香莲,周光明,王建华.水平简谐荷载作用下饱和土中群桩的动力反应[J].岩石力学与工程学报,2005,24(8):1433―1438.Zhou Xianglian,Zhou Guangming,Wang Jianhua.Dynamic response of pile group in saturated soil Subjected to horizontal loads[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(8):1433―1438.(in Chinese)
[12]Edelman I,Wilmanski K.Asymptotic analysis of surface waves at vacuum/porous medium and liquid/porous medium interfaces[J].Continuum Mech Thermody,2002,14:25―44.
[13]de Boer.Theory of porous media:Highlights in the historical development and current state[M].Berlin,Heidelberg:Springer-Verlag,2000.
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