CAJ | 학술논문

地震导致的土体液化侧移，使得轴横向受荷桩的受力与变形十分复杂。根据桩周土体的液化程度将基桩分为非液化段、液化段和嵌固段，建立考虑桩土相互作用的简化受力模型。结合土体液化侧移模式以及基桩受荷特点，推导各特征桩段的挠曲变形微分方程，并给出相应的幂级数解答。通过与试验测试结果进行对比，检验本文方法的合理性。在此基础上，探讨土体液化侧移量、荷载分布形式以及嵌固深度等对基桩的影响。分析发现：土体液化侧移量每增加30cm，基桩桩顶水平位移增加5.8mm，桩身最大弯矩增大95.6kN·m ；与竖向荷载相比，横向荷载对基桩的影响更大，横向荷载每增大50％，桩顶水平位移及桩身最大弯矩分别增加65％和54％，但基桩的“P-Δ”效应也不容忽视；改善基桩的嵌固深度可以提高基桩的抗震性能，但到达一定深度后，其效果并不明显。
지진도치적토체액화측이，사득축횡향수하장적수력여변형십분복잡。근거장주토체적액화정도장기장분위비액화단、액화단화감고단，건립고필장토상호작용적간화수력모형。결합토체액화측이모식이급기장수하특점，추도각특정장단적뇨곡변형미분방정，병급출상응적멱급수해답。통과여시험측시결과진행대비，검험본문방법적합이성。재차기출상，탐토토체액화측이량、하재분포형식이급감고심도등대기장적영향。분석발현：토체액화측이량매증가30cm，기장장정수평위이증가5.8mm，장신최대만구증대95.6kN·m ；여수향하재상비，횡향하재대기장적영향경대，횡향하재매증대50％，장정수평위이급장신최대만구분별증가65％화54％，단기장적“P-Δ”효응야불용홀시；개선기장적감고심도가이제고기장적항진성능，단도체일정심도후，기효과병불명현。
The stressed forces and deformations of piles under axial and lateral loads will become very complex w hen considering lateral displacements of liquefied soil mass caused by earthquake .In this paper ,the founda-tion pile was divided into the non-liquidizing section ,liquidizing section and embedded section according to the liquidizing degree of the surrounding soil mass and the simplification model of pile-soil interaction was estab-lished .The differential equations of bending deformations of all characteristic sections of the pile shaft were de-rived by analyzing the lateral displacements mode of liquefied soil mass and the mechanical characteristics of the loaded foundation pile ,and the corresponding power series solution were given .The solutions were verified by test results .Influence of liquefied soil mass displacements ,load distributions and embedded depths etc .on the foundation pile was further discussed .The analysis indicates as follows :For every 30cm increase of the lateral displacement of the liquefied soil mass ,the lateral displacement of the pile head increases by 5.8mm and the maximum bending moment of the pile shaft increases by 95.6 kN · m ;compared with vertical loads ,lateral loads impose greater influence on the foundation pile ,i .e .,w henever the lateral load increases by 50% ,the lateral displacement of the pile head and the maximum bending moment of the pile shaft increase by about 65%and 54% respectively ;the"P-Δ"effects are not allowed to be ignored ;lengthening of the embedded depth can improve the seismic behavior of the foundation pile ,however upon reaching a certain depth ,the improving effect becomes unobtainable .