饱和土中大直径缺陷桩水平振动响应研究

doi:10.13722/j.cnki.jrme.2019.0509

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Abstract To investigate the horizontal dynamic response of defective large-diameter piles embedded in layered saturated soils，a horizontal coupling dynamic simplified model of the defective large-diameter pile-saturated soil is established based on Biot's theory and strict plane strain assumptions. The potential function，operator decomposition method and variable separation method are introduced herein to obtain the horizontal force of the soil acting on the pile shaft，and then，the complex impedance of the pile top is derived by employing the coupling condition of the pile-soil contact interface and the stiffness matrix transfer method. The reliability of the obtained solution is verified by model comparison and degradation comparison. The results show that the enlarging segments of the pile contribute little to the increase of the complex impedance while the necking defects can significantly decrease the complex impedance. The dynamic stiffness of the pile top is more sensitive to the radius and length of the defect than the dynamic damping，and the necking defects near the pile head can more seriously reduce the complex impedance in comparison with those in the middle of the pile shaft or near the pile tip.

Key words： pile foundation layered saturated soil defective pile horizontal vibration response complex

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0509 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I2/413

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