Vertical vibration characteristics of a large diameter tapered pile considering vertical action of surrounding soil and construction disturbance effect
WANG Kuihua1, 2, GAO Liu1, 2, LI Zhenya1, 2, GUO Haichao1, 2 WANG Ning3
1. Research Center of Coastal and Urban Geo-technical Engineering, Zhejiang University, Hangzhou 310058, China;
2. MOE Key Lab of Soft Soils and Geo-environmental Engineering, Zhejiang University, Hangzhou 310058, China;
3. Institute of Geo-technical Engineering, School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330000, China
Discretizing a pile-soil system into many enough micro-element spheres, based on the multi-sphere planar strain model for complex stiffness transfer, the complex shear stiffness of the surrounding soil to the pile was derived. The vertical action of the surrounding soil on the adjacent pile micro-elements’ interface annular sections was simplified as a Voigt model, its spring and damper coefficients were derived. Then through Laplace transformation, combining the displacement continuity conditions and stress equilibrium ones on interfaces of adjacent pile micro-elements, the amended impedance function transfer method was deduced. Through solving dynamic equilibrium equations of pile micro-elements, combining the amended impedance function transfer method, the impedance function at the pile top was obtained. By comparing the solutions gained here with the published ones, the advantages of a tapered pile’s load-bearing ability were verified. Finally, a parametric analysis was conducted to study the interaction between the vertical action of surrounding soil and construction disturbance effect in low-frequency range. The results provided a guiding for aseismic design of pile foundations.
王奎华1,2，高柳1,2，李振亚1,2，郭海超1,2 王宁3. 考虑桩周土竖向作用和施工扰动效应时大直径楔形桩的纵向振动特性[J]. 振动与冲击, 2018, 37(2): 30-37.
WANG Kuihua1, 2, GAO Liu1, 2, LI Zhenya1, 2, GUO Haichao1, 2 WANG Ning3. Vertical vibration characteristics of a large diameter tapered pile considering vertical action of surrounding soil and construction disturbance effect. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(2): 30-37.
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