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该文在清华大学土工离心机振动台上开展了倾斜可液化地基中刚性单桩基础的试验研究,观测了地基的加速度、位移、孔压和桩基础的弯矩等响应。研究结果显示:地震中地基浅层部分较快达到液化状态,不同深度超静孔隙水压力的累积与消散并不相同;砂土的液化使得地基的加速度响应发生变化,有效地过滤了地震波的部分高频段;地震过程中桩身弯矩峰值出现在浅层地基达到初始液化后,且最大弯矩出现在桩头;倾斜地基使得桩身产生了较大的残余弯矩。由此表明在侧向流动地基中,液化前、液化后大变形和地震后永久位移三个不同阶段桩的受力并不相同。在进行可液化地基中桩基础的研究中,应考虑这三个不同阶段桩基础的受力要求。该研究加深了对倾斜液化地基中桩基础的地震响应的理解,有助于进一步的揭示地震过程中可液化地基桩基础的震损机理。
In this paper, the Qinghai University Geotechnical Centrifuge shaking table inclined liquefiable foundation of rigid single pile foundation of the experimental study of the foundation of the acceleration, displacement, pore pressure and pile foundation bending moment response. The results show that the shallow part of the foundation reaches the liquefaction state rapidly in the earthquake, and the accumulation and dissipation of the excess pore water pressure at different depths are not the same. The liquefaction of sand makes the response of the ground’s acceleration change and effectively filters the part of the seismic wave In the process of earthquake, the peak value of pile bending moment appears after the initial liquefaction of the shallow foundation, and the maximum bending moment appears in the pile head. The inclined foundation causes the pile body to produce larger residual bending moment. This shows that in the lateral flow of the foundation, before liquefaction, liquefaction after large deformation and post-earthquake permanent displacement of the pile in three different stages of stress is not the same. In the research of pile foundation in liquefiable foundation, the stress requirements of pile foundation in these three different stages should be considered. This study deepens the understanding of the seismic response of pile foundations in inclined liquefied ground and helps to further reveal the earthquake damage mechanism of pile foundation of liquefiable ground during earthquake.