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在清华大学土工离心机实验室50g离心场环境中进行了一系列地基自由场离心机振动台试验。试验包括1个砂土地基、1个黏土地基和2个成层土地基振动台试验。试验中模型箱采用叠环式模型箱,其平面尺寸为0.5 m和0.2 m,试验中输入地震波采用Kobe波和Parkfield波。给出了部分试验结果分析,包括加速度时程及频谱反应、加速度峰值放大系数和土层中剪应力-剪应变变化曲线。试验结果发现,不同类型地基中加速度反应存在差异,在低频部分加速度峰值放大系数从底部到顶部逐渐增大。土体中剪应力-剪应变变化规律在砂土地基和黏土地基中存在差异。
A series of free-field centrifuge shaking table tests were carried out in a centrifuge field environment of 50g geotechnical centrifuge laboratory at Tsinghua University. The test includes one sand foundation, one clay foundation and two stratified soil foundation shaking table tests. In the experiment, the model box adopts the stacked ring model box, the plane size is 0.5 m and 0.2 m. In the experiment, the input seismic wave adopts Kobe wave and Parkfield wave. Some experimental results are given, including acceleration time history and spectral response, peak acceleration amplification factor and shear stress-shear strain curve in soil. The experimental results show that the acceleration responses of different types of foundations are different, and the acceleration amplification factor in the low-frequency part gradually increases from the bottom to the top. The law of shear stress-shear strain in soils is different in sand foundation and clay foundation.