任意层地基中粘弹性楔形桩纵向振动响应研究  

Vertical dynamic response of a viscoelastic tapered pile embedded in layered foundation

作　　者：吴文兵[1,2] 王奎华[2] 窦斌[1] 

机构地区：[1]中国地质大学工程学院,武汉430074 [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310058

出　　处：《振动与冲击》2013年第8期120-127,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金面上项目(50879077);中国博士后科学基金面上项目(2012M521495);中央高校基本科研业务费专项资助(CUG120821)

摘　　要：考虑楔形桩的横向惯性效应,研究了任意层地基中粘弹性楔形桩的纵向振动问题。首先,根据楔形桩的变截面特性并考虑桩侧土的成层性,将桩土系统沿纵向划分为有限个单元。然后,采用平面应变模型模拟桩侧土,采用Rayleigh-Love杆模拟楔形桩,运用Laplace变换技术和阻抗函数传递方法,求解得到了任意层地基中桩顶速度频域响应的解析解及桩顶速度时域响应的半解析解。最后,采用参数分析方法,对楔形桩单元划分精度进行了讨论,并讨论了楔形桩设计参数及材料参数和桩侧土成层性对楔形桩纵向振动响应的影响。Considering the lateral inertial effect of a tapered pile, the vertical vibration of a viscoelastic tapered pile embedded in layered foundation was theoretically investigated. Firstly, the soil-tapered pile system was discretized into finite units considering variable cross-section of tapered pile and stratification of surrounding soil. Then, a plane strain model was adopted to simulate surrounding soil and Rayleigh-Love rode model was used to simulate tapered pile, the analytical solution to the dynamic response of the tapered pile in frequency domain and the corresponding semi-analytical solution to the dynamic response of the tapered pile in time domain were derived by means of Laplace transformation technique and impedance function transfer method. Finally, by using parametric analysis method, the accuracy of discretized units was discussed. The influences of the design parameters and material parameters of the tapered pile and the stratification of the surrounding soil on the vertical dynamic response of the tapered pile were also studied in detail.

关 键 词：楔形桩 纵向振动 任意层地基 阻抗函数 时域响应 频域响应 

分 类 号：TU435[建筑科学—岩土工程]