In previous major earthquakes, the damage and collapse of structures located in liquefied field which caused by site failure a common occurrence, and the problem of assessment of liquefaction possibility and discussion on the seismic response and stability of liquefied site is still issue of common concern in geotechnical earthquake engineering. To study the influence of the existence of structure on the seismic responses and stability of liquefiable sites, two groups of shaking table tests on liquefiable non-free field (with structure) and a free field (without structure) are performed. It can be summarized from the experimental results as following. The natural frequency of non-free field is larger and the damping ratio is smaller than that of a free field. For the weak seismic loading condition, the dynamic response of sites shows similar rules and trend. For the strong ground motion condition, soils in both experiments all liquefied obviously and the depth of liquefaction soil in the free field is significantly greater than that in the non-free field, besides, porewater pressure in the non-free field accumulated relately slow and the dissipated quickly from analysis of porewater pressure ratios in both experiments. The amplitudes of lateral displacements and acceleration of soil in the non-free field are obviously smaller than that in the free field caused by the effect of presence of the structure. In a word, the presence of structures will lead to the increase of site stiffness, site more difficult to liquefy, and the seismic stability of the non-free site is higher than that of the free site due to soil–structure interaction.

在以往的大地震中，因场地破坏而导致液化场结构破坏和倒塌的现象屡见不鲜，液化可能性的评估和液化场地地震响应与稳定性的讨论仍然是人们普遍关心的问题。岩土地震工程。为研究结构存在对可液化场地地震响应和稳定性的影响，对可液化非自由场（有结构）和自由场（无结构）进行了两组振动台试验。从实验结果可以总结如下。与自由场相比，非自由场的固有频率较大，阻尼比较小。对于弱地震荷载条件，站点的动态响应呈现出相似的规律和趋势。在强地震动条件下，两个实验中的土壤都发生了明显的液化，自由场的液化深度显着大于非自由场的，此外，非自由场的孔隙水压力积累相对缓慢且在这两个实验中，孔隙水压力比的分析中 很快消散。由于结构存在的影响，非自由场中土体的横向位移和加速度的幅度明显小于自由场中的幅度。总之，结构的存在会导致场地刚度增加，场地更难液化，由于土-结构相互作用，非自由场地的地震稳定性高于自由场地。