【摘要】 抗液化处理后，地基土刚度的增加，引起强地面运动的增加，可能会对结构设计不利。本文通过4种抗液化处理前后的地基土进行地震反应分析，研究处理后地基刚度的增加对地面加速度的影响，在相同抗液化处理厚度时，设防烈度越高，处理前后地基的周期比越大。而相同设防烈度时，抗液化处理厚度越大，处理前后地基的周期比值越小。在地震作用下，地基土抗液化处理后，地面峰值加速度均比原设防烈度有放大现象，设防烈度越高，在地震作用下地面峰值加速度放大倍数越明显，可达到2.2倍。并且地面峰值加速度放大倍数随着抗液化地基土处理深度的增加先增后降，在处理深度12m时达到极值。因此浅层地基土抗液化处理后，在设计时应予以考虑处理后地面峰值加速度放大的不利影响。更多还原

【Abstract】 After undergoing anti-liquefaction treatment, the stiffness of foundation soil increases, which can lead to an amplification of strong ground motion and potentially pose challenges for structural design. This paper conducts a seismic response analysis on four types of foundation soils, both before and after anti-liquefaction treatment, to investigate how increased foundation stiffness affects ground acceleration. For a constant anti-liquefaction treatment thickness, a higher fortification intensity results in a greater period ratio of the foundation before and after treatment. Conversely, for a constant fortification intensity, increasing the anti-liquefaction treatment thickness reduces the period ratio of the foundation before and after treatment. During an earthquake, treated foundation soils exhibit an amplified peak ground acceleration compared to their original fortification intensity. The amplification factor of peak ground acceleration becomes more pronounced with higher fortification intensity, reaching up to 2.2 times the original value. Additionally, the amplification factor initially increases and then decreases with greater treatment depth, peaking at a depth of 12 meters. Therefore, when designing structures on shallow foundation soils treated for anti-liquefaction, it is essential to consider the potential adverse effects of increased peak ground acceleration post-treatment.更多还原