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针对上覆0.3m粘土层、下伏1.2m饱和砂层的可液化场地,采用2×2群桩-低承台-独柱墩结构,完成了可液化场地桥梁群桩基动力反应振动台试验。结果表明:随着埋深增加,土体孔压、加速度和位移趋于减小,随着输入频率的增大,土体孔压和加速度增大,土体位移则减小;桩的加速度和弯矩反应自下而上呈现增大趋势,桩的弯矩在承台处达到最大值,且随着输入频率的增大而减小;随着埋深的增加,桩上土反力和桩-土相对位移减小,土体模量增大;随着输入频率的增大,土体模量及耗能变小。
Aiming at liquefiable site with 0.3m clay layer and 1.2m saturated sand underneath, 2 × 2 group pile-low cap platform-single column pier structure was used to complete the shaking table test of pile foundation dynamic response of liquefiable site bridge group . The results show that with the increase of buried depth, the pore pressure, acceleration and displacement tend to decrease. As the input frequency increases, the soil pore pressure and acceleration increase, while the soil displacement decreases. The pile acceleration and The bending moment response increases from the bottom to the top, and the bending moment of the pile reaches the maximum at the bearing platform and decreases with the increase of the input frequency. With the increase of the buried depth, the soil reaction force and pile - The relative displacement of soil decreases and the soil modulus increases. With the increase of input frequency, the soil modulus and energy dissipation become smaller.