砂土地基自由场离心机振动台模型试验

Dynamic centrifuge model test of an unconfined sandy foundation

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。

The seismic response of an unconfined sandy foundation was tested on a centrifuge shaking table which was also used to test the effects of a border and a laminar model box. The dynamic centrifuge tests of the unconfined sandy foundation had a Kobe wave input motion with gravitational accelerations of 50 g. The paper provides partial test results including accelerations and displacements of the sandy foundation. The results indicate that the laminar model box avoids the disadvantages of the boundary effect and can accurately simulate the shear deformation of the unconfined field. The test equipment, measuring instruments, and data collection system all performed well, so the system provides a good base for future tests.