倾斜荷载下大直径长桩的承载特性研究

摘要

基于数值分析与荷载传递相结合的方法,利用FLAC3D软件对倾斜荷载下大直径长桩的承载特性进行了研究.结果表明:荷载倾角不同,基桩承载特性不同；存在一临界角,在荷载倾角从小于临界角变化到超过临界角过程中,桩的承载特性由以竖向为主转化为以水平向为主,本研究的工况,临界角约20°.通过与前人的研究成果对比分析,发现Koumoto倾斜系数和Meyerhof包络线半经验公式都不能准确估算临界角所对应的极限承载力.%Based on numerical analysis in association with load transfer method, the bearing behaviors of large-diameter long pile under inclined loads are studied by using software FLAC3D. It' s found that the bearing behavior of pile in clay is determined by the inclination. When the inclination varies from being smaller than a critical angle to being larger than the critical angle, which is about 20° for the case in this paper, the bearing mode changes from vertical-load dominated to horizontal-load dominated. Through comparison with previous researches, it' s found that both the inclination factor given by Koumoto and the semi-empirical envelope formula proposed by Meyerhof can' t estimate the ultimate bearing capacity accurately.