Liquefaction hazard induced by seismic events might affect the stability of buried pipelines, with permanent displacements of the embedded structure as a consequence. In this context, the pipe uplift is of main concern, as already widely discussed in the literature. In this paper, further insights to assess the phenomenon and the related effects on pipelines are provided based on the results of shaking table tests on pipes of different apparent unit weight. A multiple shaking sequence is adopted on each model. Among others, data here reported confirms that, with liquefaction occurrence, upward displacement is expected for a pipe with an apparent unit weight smaller or equal to the unit weight of the sand deposit; the opposite for larger apparent unit weight. The pipe vertical displacement is initiated with the first earthquake that in sequence induces liquefaction extensively in the soil deposit. The uplift rate is higher for this shaking, and then it reduces for the next earthquakes even for bigger shaking amplitude. The onset of uplift varies for successive earthquakes depending on the magnitude of the input motion, the relative density and the weight of the structure. A transient horizontal movement of the transversal cross section of the pipe, due to the earthquake loading inducing liquefaction in the soil deposit, can be significant and induce pipe damages.

地震事件引起的液化危险可能会影响地下管道的稳定性，从而导致埋入结构的永久位移。在这种情况下，正如文献中已经广泛讨论的那样，管道的隆起是主要问题。本文基于对不同表观重量的管道进行振动台试验的结果，提供了进一步的见解，以评估该现象及其对管道的影响。每个模型采用多次摇动顺序。其中，这里报道的数据证实，随着液化的发生，对于表观单位重量小于或等于沙沉积物单位重量的管子，预计会发生向上位移。对于较大的表观单位重量则相反。管道的垂直位移始于第一次地震，该地震依次在土壤沉积物中引起广泛的液化。对于这种振动，上升速率较高，然后，即使较大的振动幅度，在下一次地震中上升速率也会减​​小。对于连续地震，隆起的起始时间取决于输入运动的大小，结构的相对密度和重量。由于地震载荷引起土壤沉积物中的液化，管道横向横截面的瞬时水平运动可能是显着的，并引起管道损坏。对于连续地震，隆起的起始时间取决于输入运动的大小，结构的相对密度和重量。由于地震载荷引起土壤沉积物中的液化，管道横向横截面的瞬时水平运动可能是显着的，并引起管道损坏。对于连续地震，隆起的起始时间取决于输入运动的大小，结构的相对密度和重量。由于地震载荷引起土壤沉积物中的液化，管道横向横截面的瞬时水平运动可能是显着的，并引起管道损坏。