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以天津站交通枢纽工程为背景,开展了复杂结构–桩–土相互作用振动台模型试验,研究了桩土相互作用的动力特性。运用弹性地基梁理论,得出弯矩时程和土压力,采用实测桩的加速度值积分求得桩的位移,得到桩–土动力p–y曲线,求出了不同深度及不同时间段阻尼与弹簧刚度系数分布规律。研究表明:受底部筏板的影响,阻尼与土弹簧刚度沿桩身分布可近似考虑成分段线性,分段点约在桩身上部1/3范围处。阻尼与弹簧刚度均随埋深的增加而增大;随着地震动的持续,阻尼基本稳定,只在桩底略有增大;弹簧刚度随振动时间持续有所降低,且随埋深增大,其降低的幅度越大。
Taking the Tianjin Railway Station as a background, the shaking table model test of complex structure-pile-soil interaction was carried out and the dynamic characteristics of pile-soil interaction were studied. Using the theory of elastic foundation beam, the bending moment and earth pressure are obtained, and the pile displacement is obtained by integrating the acceleration of the measured pile. The p-y curve of pile-soil dynamic is obtained, and the damping and Spring stiffness coefficient distribution. The results show that the influence of the bottom raft, the damping and the spring stiffness of the soil spring along the pile body can be approximated by considering the linearity of the member sections, and the section points are about 1/3 of the upper part of the pile body. Damping and spring stiffness both increase with the increase of buried depth. With the continuous ground motion, the damping is basically stable and only slightly increases at the bottom of the pile. The spring stiffness decreases with the increase of the buried depth , The greater the extent of its reduction.