Study on dynamic properties and liquefication of silt

Abstract

本文对典型的粉土进行了试验研究。结合共振柱和动三轴试验结果 ,得到了 G/Gmax～γ/γr 和 D～γ曲线。在动三轴仪上 ,安装了压电陶瓷弯曲元用以测试土样的 Gmax,并通过先期振动控制试样Gmax,在土样密度和 Gmax同时与现场土体一致的情况下 ,进行了应变控制的动三轴液化试验。根据试验结果 ,给出了粉土在不同的地震震级下的临界剪应变变化范围和均值。 Test and research on typical silt are conducted herein. G/G max ~ γ/γ r and D～γ curves are acquired by combining the test results of resonant column and cyclic triaxial tests.Bender element system is installed on the triaxial apparatus to measure the G max of soil sample.Strain controlled triaxial liquefaction tests are conducted under the condition when the density of soil samples and G max are both the same with those of soil mass in the field. The variation range and mean value of critical shear strain of silt during different seismic intensities are given based on the test results.