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首先介绍了构建软黏土中水平受荷桩静力p–y曲线的拟三维分析方法,该方法基于考虑土体特性的二维弹性虚拟加载上限方法和改进的三维极限承载力剖面。基于水平受荷桩的静力p–y曲线,引入土体不排水抗剪强度和塑性累积位移间的关系和Masing准则,建立了水平受荷桩的循环p–y曲线。采用考虑土体应力–应变关系及强度衰减的p–y曲线分析离心机模型试验,计算结果表明本文方法可较好地模拟黏土中水平受荷桩的静力及循环承载特性。经试验标定土性相关参数后,本文循环p–y曲线在不同循环荷载幅值下获得的桩顶荷载–位移滞回曲线及相应桩顶荷载衰减曲线均与离心试验结果基本吻合。
Firstly, a quasi-three-dimensional analysis method for constructing the static p-y curve of horizontal loaded piles in soft clay is introduced. The method is based on a two-dimensional elastic upper bound method and an improved three-dimensional ultimate bearing capacity profile considering soil characteristics. Based on the static p-y curve of horizontal loaded piles, the relationship between undrained shear strength of soil and plastic cumulative displacement and the Masing criterion are introduced to establish the cyclic p-y curve of horizontal loaded piles. Centrifuge model test is carried out by p-y curve analysis considering stress-strain relationship and strength attenuation of soil, and the calculation results show that the proposed method can simulate the static and cyclic load characteristics of horizontally loaded piles in clay well. After testing and calibrating the relevant parameters of soil, the curve of load-displacement hysteresis and the load decay curve of pile top obtained by cyclic p-y curve under different cyclic load amplitudes are in good agreement with the results of centrifugal test.