嵌岩桩沉渣特性对桩顶动力响应的影响
|
摘要
基于虚土桩模型,运用Laplace积分变换和阻抗函数递推方法研究了纵向任意激振力作用下沉渣特性对成层土中嵌岩桩桩顶动力响应的影响.将桩端沉渣模拟为虚土桩,对桩侧土采用平面应变模型,并考虑其成层特性,结合初始条件和桩顶及沉渣底部的边界条件,求得在桩顶任意激振力作用下,考虑沉渣影响的桩顶频域响应解析解及时域响应半解析解.基于理论解,分析了沉渣特性对桩顶动力响应的影响,并将理论计算结果与工程桩低应变反射波法实测曲线进行了拟合对比,结果表明,基于虚土桩模型的理论解能较好地反演出沉渣特性对桩顶动力响应的影响.
Based on virtual soil pile model,the influence of sediment characteristics on the dynamic response of rock-socketed pile in layered soil was presented by means of Laplace integral transform technique and impedance function transfer method when the top of rock-socketed pile was undergoing arbitrary longitudinal exciting force.The sediment was modeled as virtual soil pile model whose cross-section area was same as the pile and the surrounding layered soils were described with the plane strain model.By using the initial conditions and boundary conditions of the soil-pile system,the analytical solutions for the longitudinal dynamic response of the pile top in frequency domain and the relevant semi-analytical solutions in time domain were obtained at condition of arbitrary excitation on the pile top.Based on the presented solutions,the influence of sediment characteristics on the dynamic response at the pile top was investigated.By using the parametric inversion method,it is proved that these solutions based on virtual soil pile model have sufficient accuracy for the theoretical curves were in good agreement with those obtained by the low-strain reflected wave method from the field measurement.
Based on virtual soil pile model,the influence of sediment characteristics on the dynamic response of rock-socketed pile in layered soil was presented by means of Laplace integral transform technique and impedance function transfer method when the top of rock-socketed pile was undergoing arbitrary longitudinal exciting force.The sediment was modeled as virtual soil pile model whose cross-section area was same as the pile and the surrounding layered soils were described with the plane strain model.By using the initial conditions and boundary conditions of the soil-pile system,the analytical solutions for the longitudinal dynamic response of the pile top in frequency domain and the relevant semi-analytical solutions in time domain were obtained at condition of arbitrary excitation on the pile top.Based on the presented solutions,the influence of sediment characteristics on the dynamic response at the pile top was investigated.By using the parametric inversion method,it is proved that these solutions based on virtual soil pile model have sufficient accuracy for the theoretical curves were in good agreement with those obtained by the low-strain reflected wave method from the field measurement.
引文
[1]蔡邦国,陈德银.嵌岩桩桩底沉渣在桩基检测信号中的反应[J].土工基础,2005,19(5):89-90.CAI Bang-guo,CHEN De-yin.Reflection of residencearound inserted pile bottom in pile foundation checkingsignals[J].Soil Engineering and Foundation,2005,19(5):89-90.
[2]旺昕,刘誉,徐辉.沉渣对低应变曲线影响的仿真分析[J].土工基础,2009,23(3):74-76.WANG Xin,LIU Yu,XU Hui.Numeral analysis oflow strain curves influenced by dregginess[J].Soil Engi-neering and Foundation,2009,23(3):74-76.
[3]王海东,尚守平.瑞利波作用下径向非匀质地基中的单桩竖向响应研究[J].振动工程学报,2006,19(2):258-264.WANG Hai-dong,SHANG Shou-ping.Research onvertical dynamic response of single-pile in radically inho-mogeneous soil during the passage of Rayleigh waves[J].Journal of Vibration Engineering,2006,19(2):258-264.
[4]王奎华,李冰河,谢康和,等.弹性支承桩受迫振动问题广义函数解及应用[J].浙江大学学报:工学版,1998,32(5):545-551.WANG Kui-hua,LI Bing-he,XIE Kang-he,et al.Ageneralized solution to the vibration of elastic supportingfoundation pile under exciting force and its application[J].Journal of Zhejiang University:Engineering Sci-ence,1998,32(5):545-551.
[5]孔德森,栾茂田,杨庆.桩土相互作用分析中的动态Winkler模型研究评述[J].世界地震工程,2005,21(1):12-17.KONG De-sen,LUAN Mao-tian,YANG Qing.Reviewof dynamic Winkler model applied in pile-soil interactionanalyses[J].World Earthquake Engineering,2005,21(1):12-17.
[6]冯世进,陈云敏,刘明振.成层土中黏弹性桩纵向振动分析及工程应用[J].中国公路学报,2004,17(2):59-63.FENG Shi-jin,CHEN Yun-min,LIU Ming-zhen.Anal-ysis and application in engineering on vertical vibration of viscoelasticity piles in layered soil[J].China Journal of Highway and Transport,2004,17(2):59-63.
[7]NOGAMI T,KONGAI K.Time domain axial response of dynamically loaded single piles[J].Journal of Engineering Mechanics Division,ASCE,1986,112:1241-1252.
[8]王奎华,谢康和,曾国熙.变截面阻抗桩受迫振动问题解析解及应用[J].土木工程学报,1998,31(6):56-67.WANG Kui-hua,XIE Kang-he,ZENG Guo-xi.An ana-lytical solution to forced vibration of foundation pile with variable section impedance and its application[J].China Civil Engineering Journal,1998,31(6):56-67.
[9]胡昌斌,黄晓明.成层黏弹性土中桩土耦合纵向振动时域响应研究[J].地震工程与工程振动,2006,26(4):205-211.HU Chang-bin,HUANG Xiao-ming.A quasi-analytical solution to soil-pile interaction in longitudinal vibration in layered soils considering vertical wave effect on soils[J].Earthquake Engineering and Engineering Vibration,2006,26(4):205-211.
[10]王奎华.成层广义Voigt地基中黏弹性桩纵向振动分析与应用[J].浙江大学学报:工学版,2002,36(5):555-571,595.WANG Kui-hua.Vibration of inhomogeneous viscous-elastic pile embedded in layered soils with general Voigt model[J].Journal of Zhejiang University:Engineering Science,2002,36(5):555-571,595.
[11]ZENG X,RAJAPAKSE R K N D.Dynamic axial load transfer from elastic bar to poroelastic medium[J].Journal of Engineering Mechanics,ASCE,1999,125(9):1048-1055.
[12]CAI Yuan-qiang,CHEN Gang,XU Chang-jie,et al.Torsional response of pile embedded in a poroelastic medium[J].Soil Dynamics and Earthquake Engineering,2006,26:1143-1148.
[13]MUKI R,STERNBERG E.Electrostatic load-transfer to a half-space from a partially embedded axially loaded rod[J].International Journal of Solids and Structures,1970,6:69-90.
[14]NOVAK M,ABOUL-ELLA F.Impedance functions of piles in layered media[J].Journal of the Engineering Me-chanical Division,ASCE,1978,104(EM3):643-661.
[15]NOVAK M,NOGAMI T,ABOUL-ELLA F.Dynam-ic soil reaction for plane strain case[J].Journal of the Engineering Mechanical Division,ASCE,1978,104(EM4):953-959.
[2]旺昕,刘誉,徐辉.沉渣对低应变曲线影响的仿真分析[J].土工基础,2009,23(3):74-76.WANG Xin,LIU Yu,XU Hui.Numeral analysis oflow strain curves influenced by dregginess[J].Soil Engi-neering and Foundation,2009,23(3):74-76.
[3]王海东,尚守平.瑞利波作用下径向非匀质地基中的单桩竖向响应研究[J].振动工程学报,2006,19(2):258-264.WANG Hai-dong,SHANG Shou-ping.Research onvertical dynamic response of single-pile in radically inho-mogeneous soil during the passage of Rayleigh waves[J].Journal of Vibration Engineering,2006,19(2):258-264.
[4]王奎华,李冰河,谢康和,等.弹性支承桩受迫振动问题广义函数解及应用[J].浙江大学学报:工学版,1998,32(5):545-551.WANG Kui-hua,LI Bing-he,XIE Kang-he,et al.Ageneralized solution to the vibration of elastic supportingfoundation pile under exciting force and its application[J].Journal of Zhejiang University:Engineering Sci-ence,1998,32(5):545-551.
[5]孔德森,栾茂田,杨庆.桩土相互作用分析中的动态Winkler模型研究评述[J].世界地震工程,2005,21(1):12-17.KONG De-sen,LUAN Mao-tian,YANG Qing.Reviewof dynamic Winkler model applied in pile-soil interactionanalyses[J].World Earthquake Engineering,2005,21(1):12-17.
[6]冯世进,陈云敏,刘明振.成层土中黏弹性桩纵向振动分析及工程应用[J].中国公路学报,2004,17(2):59-63.FENG Shi-jin,CHEN Yun-min,LIU Ming-zhen.Anal-ysis and application in engineering on vertical vibration of viscoelasticity piles in layered soil[J].China Journal of Highway and Transport,2004,17(2):59-63.
[7]NOGAMI T,KONGAI K.Time domain axial response of dynamically loaded single piles[J].Journal of Engineering Mechanics Division,ASCE,1986,112:1241-1252.
[8]王奎华,谢康和,曾国熙.变截面阻抗桩受迫振动问题解析解及应用[J].土木工程学报,1998,31(6):56-67.WANG Kui-hua,XIE Kang-he,ZENG Guo-xi.An ana-lytical solution to forced vibration of foundation pile with variable section impedance and its application[J].China Civil Engineering Journal,1998,31(6):56-67.
[9]胡昌斌,黄晓明.成层黏弹性土中桩土耦合纵向振动时域响应研究[J].地震工程与工程振动,2006,26(4):205-211.HU Chang-bin,HUANG Xiao-ming.A quasi-analytical solution to soil-pile interaction in longitudinal vibration in layered soils considering vertical wave effect on soils[J].Earthquake Engineering and Engineering Vibration,2006,26(4):205-211.
[10]王奎华.成层广义Voigt地基中黏弹性桩纵向振动分析与应用[J].浙江大学学报:工学版,2002,36(5):555-571,595.WANG Kui-hua.Vibration of inhomogeneous viscous-elastic pile embedded in layered soils with general Voigt model[J].Journal of Zhejiang University:Engineering Science,2002,36(5):555-571,595.
[11]ZENG X,RAJAPAKSE R K N D.Dynamic axial load transfer from elastic bar to poroelastic medium[J].Journal of Engineering Mechanics,ASCE,1999,125(9):1048-1055.
[12]CAI Yuan-qiang,CHEN Gang,XU Chang-jie,et al.Torsional response of pile embedded in a poroelastic medium[J].Soil Dynamics and Earthquake Engineering,2006,26:1143-1148.
[13]MUKI R,STERNBERG E.Electrostatic load-transfer to a half-space from a partially embedded axially loaded rod[J].International Journal of Solids and Structures,1970,6:69-90.
[14]NOVAK M,ABOUL-ELLA F.Impedance functions of piles in layered media[J].Journal of the Engineering Me-chanical Division,ASCE,1978,104(EM3):643-661.
[15]NOVAK M,NOGAMI T,ABOUL-ELLA F.Dynam-ic soil reaction for plane strain case[J].Journal of the Engineering Mechanical Division,ASCE,1978,104(EM4):953-959.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心