饱和砂土振动液化过程中桩土相互作用的试验研究

采用自主研发的振动台试验装置模拟饱和砂土的振动液化过程,振动台试验装置进行了两点创新:一是振动台模型试验箱采用密闭装置,通过气压对饱和土层施加10kPa的上覆压力从而模拟了工程实践中上覆土层的压力;二是模型试验桩桩顶安装桩头重物,模拟上部结构对桩基础的约束作用;试验过程中对不同土层深度处的孔隙水压力、振动台台面和桩顶加速度、桩身应变进行了实时数据采集,数据结果合理,为后续理论分析提供了可靠的试验数据。

Experimental Study on Pile and Soil Interaction during Liquefaction of Saturated Sands

In this paper,shaking table test device was used to simulate the vibration liquefaction process of saturated sand,there are two innovations of the shaking table test device: one is that vibration table model test box adopts airtight device,and the air pressure 10kPa is forced on saturated soil layer,which simulates the overlaying soil pressure in engineering practice;another is that pile weight is set up on the model test pile,which simulates the constraint function of the upper structure to the pile foundation.In the test process,the pore water pressure in different depths,the vibration table and pile top acceleration,and the pile body strain were monitored in real-time,the data results are reasonable,which can provide reliable test data for the subsequent theoretical analysis.