|
|
|
| ANALYTICAL SOLUTION OF VERTICAL VIBRATION RESPONSE OF LARGE DIAMETER PIPE PILE IN HYSTERETIC DAMPING SOIL |
| ZHENG Changjie1，2，DING Xuanming1，3，HUANG Xu1，2，KONG Gangqiang1，2 |
(1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Research Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210098，China；3. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety，Hohai University，
Nanjing，Jiangsu 210098，China) |
|
|
|
|
Abstract Considering the hysteretic damping of soil and coupled vibration between pile，outer and inner soil，the frequency-domain vertical vibration response of cast-in-place concrete large diameter pipe pile in viscoelastic soil is investigated. The pile and the soil are treated as one-dimensional rod and axisymmetric viscoelastic medium，respectively. The frequency domain solutions of outer and inner soil are obtained by Laplace transformation technique and separation of variables method. The dynamic response of pile is then obtained based on the continuity assumption of displacement and stress between pile and outer soil as well as inner soil. The solution is compared with that of solid pile to verify its rationality. Moreover，by analyzing the effects of pile length，shear modulus of soil and pile radii on the complex stiffness of pile，the regularity of variations of vibration characteristic with parameters is obtained. Analysis shows that the oscillation amplitudes and resonance frequencies of complex impedance of pile decrease with the increasing pile length，but when pile length increases to a critical length，the effect tends to vanish；the oscillation amplitudes of complex impedance decrease with the increasing shear modulus of soil，and the effect of shear modulus of outer soil is larger than that of inner soil；the oscillation amplitudes of complex impedance increase with the increasing outer radius or decreasing inner radius.
|
|
Received: 24 December 2012
|
|
|
|
| [1] NOVAK M，NOGAMI T，ABOUL-ELLA F. Dynamics soil reactions for plane strain case[J]. Journal of the Engineering Mechanics Division，ASCE，1978，104(EM4)：953–959.
[2] MILITANO G，RAJAPAKSE R. Dynamic response of a pile in a multi-layered soil to transient torsional and axial loading[J]. Geotechnique，1999，49(1)：91–109.
[3] NOGAMI T，KONAGAI K. Time domain axial response of dynamically loaded single piles[J]. Journal of Engineering Mechanics，ASCE，1986，112(11)：1 241–1 252.
[4] NOGAMI T，NOVAK M. Soil-pile interaction in vertical vibration[J]. Earthquake Engineering and Structural Dynamics，1976，4(3)：277–293.
[5] 胡昌斌，王奎华，谢康和. 考虑桩土耦合作用时弹性支承桩纵向振动特性分析及应用[J]. 工程力学，2003，20(2)：146–154.(HU Changbin，WANG Kuihua，XIE Kanghe. Soil-pile interaction in vertical vibrations of a pile with elastic bottom boundaries and its applications[J]. Engineering Mechanics，2003，20(2)：146–154.(in Chinese))
[6] 刘汉龙，费 康，马晓辉，等. 振动沉模大直径现浇薄壁管桩技术及其应用(I)：开发研制与设计[J]. 岩土力学，2003，24(2)：164–168. (LIU Hanlong，FEI Kang，MA Xiaohui，et al. Cast-in-situ concrete thin-wall pipe pile with vibrated and steel tube mould technology and its application(I)：development and design[J]. Rock and Soil Mechanics，2003，24(2)：164–168.(in Chinese))
[7] 刘汉龙，郝小员，费 康，等. 振动沉模大直径现浇薄壁管桩技术及其应用(Ⅱ)工程应用与现场试验[J]. 岩土力学，2003，24(3)：372–375.(LIU Hanlong，HAO Xiaoyuan，FEI Kang，et al. Field pour concrete thin wall cased pile technology and its application(Ⅱ)：Application and in-situ test[J]. Rock and Soil Mechanics，2003，24(3)：372–375.(in Chinese))
[8] LIU H L，CHU J，DENG A. Use of large-diameter cast in situ concrete pipe piles for embankment over soft clay[J]. Canadian Geotechnical Journal，2009，46(8)：915–927.
[9] LIU Z P，LIU H L，TAN H M. Application of PCC pile in soil improvement of highway[J]. Journal of Central South University of Technology，2008，15(Supp.2)：108–113.
[10] 丁选明，刘汉龙. 轴对称均匀黏弹性地基中现浇薄壁管桩纵向动力响应简化解析方法[J]. 岩土力学，2008，29(12)：3 353–3 359. (DING Xuanming，LIU Hanlong. Simplified analytical method of vertical dynamic response of cast-in-situ concrete thin-wall pipe piles in axial symmetric homogeneous viscoelastic soil[J]. Rock and Soil Mechanics，2008，29(12)：3 353–3 359.(in Chinese)) |
|
|
|
2014, Vol. 33 
