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设计并开展了可液化场地群桩基础大型振动台模型试验,再现了倾斜场地土体液化、流滑以及桩基倾斜等宏观现象,分析了场地土体及桩基结构地震反应特征。结果表明:群桩存在时的液化倾斜场地流滑可区分为局部流滑和整体流滑两个阶段;倾斜场地土体中的振动孔隙水压力演变过程和空间分布受土体流滑影响,桩间土相对不易液化;斜坡倾角越大,土体侧向大位移可引起更大的桩侧动土压力反应和桩基承台偏移量。但是,该文试验结果表明,桩基结构的倾斜在一定程度上弱化了其内力反应;无论是倾斜场地还是水平场地,桩身弯矩最大值均出现在非液化土层与液化土层分界面附近。
The large-scale shaking table test of pile group foundation in liquefiable site was designed and carried out. The macro-phenomena such as liquefaction, slippery slope and pile inclination were reproduced. The seismic response characteristics of site soil and pile foundation structure were analyzed. The results show that the slippery liquefaction field in the presence of pile groups can be divided into two stages: local flow slip and integral flow slip; the evolution process and spatial distribution of the vibration pore water pressure in sloping field soil are affected by soil slippery, Soil between the soil is relatively not easy to liquefaction; the greater slope angle, large lateral displacement of soil can cause greater pile side earth pressure reaction and pile cap displacement. However, the experimental results show that the inclination of the pile foundation structure weakens the internal force response to a certain extent. The maximum bending moment of the pile body appears at the interface between the non-liquefiable soil layer and the liquefied soil layer in either inclined or horizontal ground nearby.