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为了观察砂土地基自由场的地震响应情况和检验试验用叠环式模型箱的边界效应影响以及应用效果,在输入地震波(采用K obe波)、离心加速度为50 g的条件下,进行了砂土地基自由场动力离心试验。文中给出了加速度反应和位移反应量测结果,研究了砂土地基的地震反应情况。试验结果表明:叠环式模型箱可以较好地模拟自由场土层的剪切变形,边界效应影响较小;振动台的激振性能、数据量测仪器与采集系统的使用效果均良好,从而为后续有关试验奠定了基础。
In order to observe the seismic response of the free field on the sand foundation and the boundary effect of the stacked ring model box used in the test and the effect of the applied test, sand was input under the conditions of the input seismic wave (using K obe wave) and the centrifugal acceleration of 50 g Free - field centrifugal test of soil foundation. The results of acceleration and displacement measurements are given in this paper. The seismic response of sandy soil foundation is studied. The experimental results show that the model box can simulate the shear deformation of free-field soil well and the effect of boundary effect is small. The excitation performance of vibration table, the effect of data measuring instrument and acquisition system are good, For the follow-up test laid the foundation.