基于多孔介质理论的饱和土-桩纵向耦合振动研究
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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。将土体视为两相多孔介质,运用多孔介质理论表现土体的宏观力学性能,通过引入势函数和利用分离变量的方法,研究分析饱和土中桩基的纵向耦合振动问题,在此基础上,研究物性参数对饱和土-桩耦合体系动力学行为的影响。研究表明:长径比、桩土模量比对饱和土中桩的纵向振动有较大的影响,而土体黏滞阻尼系数和液固耦合系数也有一定的影响,但影响相对较小。
Because of the flow characteristics of pore water in saturated soils and the difference of porosities between pile and soil,the mechanical properties and especially the dynamic behaviors of piles in saturated soils are greatly different from those of piles in dry soils.Based on porous medium theory,the vertical coupled vibration of a pile in a saturated soil is investigated,with the introduction of the potential functions and the method of separation of variables.The soil is regard as a porous medium filled with water,and the mechanical properties of the soil are determined using the theory of porous medium.The influences of the material parameters on the dynamical behaviors of a saturated soil-pile system are examined numerically.It is shown that length-diameter ratio and modulus ratio have a great influence on the vertical vibration of the pile in saturated soil,while the influences of soil damping and coupled coefficient are smaller.
Because of the flow characteristics of pore water in saturated soils and the difference of porosities between pile and soil,the mechanical properties and especially the dynamic behaviors of piles in saturated soils are greatly different from those of piles in dry soils.Based on porous medium theory,the vertical coupled vibration of a pile in a saturated soil is investigated,with the introduction of the potential functions and the method of separation of variables.The soil is regard as a porous medium filled with water,and the mechanical properties of the soil are determined using the theory of porous medium.The influences of the material parameters on the dynamical behaviors of a saturated soil-pile system are examined numerically.It is shown that length-diameter ratio and modulus ratio have a great influence on the vertical vibration of the pile in saturated soil,while the influences of soil damping and coupled coefficient are smaller.
引文
[1]Edelman I,Wilmanski K.Asymptotic analysis of surfacewaves at vacuum/porous medium and liquid/porousmedium interfaces[J].Continuum MechanicsThermodynamics,2002,14(1):25-44
[2]Zeng X,Rajapakse R K N D.Dynamic axial load transferfrom elastic bar to poroelastic medium[J].Journal ofEngineering Mechanics,ASCE,1999,125(9):1048-1055
[3]Jin B,Zhou D,Zhong Z.Lateral dynamic compliance ofpile embedded in poroelastic half space[J].Soil Dynamicsand Earthquake Engineering,2001,21(6):519-525
[4]Maeso O,Aznarez J J,Garcia F.Dynamic impedances ofpiles and groups of piles in saturated soils[J].Computersand Structures,2005,83(10-11):769-782
[5]李强,王奎华,谢康和.饱和土中端承桩纵向振动特性研究[J].力学学报,2004,36(4):435-442(Li Qiang,Wang Kuihua,Xie Kanghe.Vertical vibration of an endbearing pile embedded in saturated soil[J].ActaMechanica Sinica,2004,36(4):435-442(in Chinese))
[6]李强,王奎华,谢康和.饱和土桩纵向振动引起土层复阻抗分析研究[J].岩土工程学报,2004,26(5):679-683(Li Qiang,Wang Kuihua,Xie Kanghe.Study on resistancefactor of saturated soil caused by longitudinal vibration ofpile[J].Chinese Journal of Geotechnical Engineering,2004,26(5):679-683(in Chinese))
[7]陆建飞.频域内半空间饱和土中水平受荷桩的动力分析[J].岩石力学与工程学报,2002,21(4):577-581(LuJianfei.Dynamic frequency domain analysis on laterallyloaded pile in saturated soil[J].Chinese Journal of RockMechanics and Engineering,2002,21(4):577-581(inChinese))
[8]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(ZhangYuhong,Huang Yi.Dynamic impedance of group piles intwo-phase fluid-saturated soils[J].EarthquakeEngineering and Engineering Vibration,2001,21(3):113-116(in Chinese))
[9]De Boer R,Liu Zhanfang.Propagation of accelerationwaves in incompressible saturated porous solids[J].Transport in Porous Media,1995,21(2):163-173
[10]De Boer R,Liu Zhanfang.Plane waves in a semi-infinitefluid saturated porous medium[J].Transport in PorousMedia,1994,16(2):147-173
[2]Zeng X,Rajapakse R K N D.Dynamic axial load transferfrom elastic bar to poroelastic medium[J].Journal ofEngineering Mechanics,ASCE,1999,125(9):1048-1055
[3]Jin B,Zhou D,Zhong Z.Lateral dynamic compliance ofpile embedded in poroelastic half space[J].Soil Dynamicsand Earthquake Engineering,2001,21(6):519-525
[4]Maeso O,Aznarez J J,Garcia F.Dynamic impedances ofpiles and groups of piles in saturated soils[J].Computersand Structures,2005,83(10-11):769-782
[5]李强,王奎华,谢康和.饱和土中端承桩纵向振动特性研究[J].力学学报,2004,36(4):435-442(Li Qiang,Wang Kuihua,Xie Kanghe.Vertical vibration of an endbearing pile embedded in saturated soil[J].ActaMechanica Sinica,2004,36(4):435-442(in Chinese))
[6]李强,王奎华,谢康和.饱和土桩纵向振动引起土层复阻抗分析研究[J].岩土工程学报,2004,26(5):679-683(Li Qiang,Wang Kuihua,Xie Kanghe.Study on resistancefactor of saturated soil caused by longitudinal vibration ofpile[J].Chinese Journal of Geotechnical Engineering,2004,26(5):679-683(in Chinese))
[7]陆建飞.频域内半空间饱和土中水平受荷桩的动力分析[J].岩石力学与工程学报,2002,21(4):577-581(LuJianfei.Dynamic frequency domain analysis on laterallyloaded pile in saturated soil[J].Chinese Journal of RockMechanics and Engineering,2002,21(4):577-581(inChinese))
[8]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(ZhangYuhong,Huang Yi.Dynamic impedance of group piles intwo-phase fluid-saturated soils[J].EarthquakeEngineering and Engineering Vibration,2001,21(3):113-116(in Chinese))
[9]De Boer R,Liu Zhanfang.Propagation of accelerationwaves in incompressible saturated porous solids[J].Transport in Porous Media,1995,21(2):163-173
[10]De Boer R,Liu Zhanfang.Plane waves in a semi-infinitefluid saturated porous medium[J].Transport in PorousMedia,1994,16(2):147-173
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