基于动三轴试验的现场液化判别剪切波速法

Liquefaction evaluation by means of shear wave velocity method based on cyclic triaxial tests

通过控制土体剪切波速的动三轴液化试验 ,得到了更能真实地反映土体的抗液化能力的临界剪应变参数。文中探讨了各因素对临界剪应变的影响 ,并结合动三轴试验结果和剪切波速判别方法 ,对取土地区自由场地进行液化评估 。

Cyclic triaxial tests is carried out to evaluate dynamic properties of silt and silty sand samples. The shear wave velocities of these samples are controlled to match those in situ. This approach shows great effect on storing the natural structure of soil, while the samples indicate higher liquefaction resistance than those whose shear wave velocities are not controlled. Results obtained from tests indicate that the critical shear strain changes with the cyclic number, confining pressure, gain composition and soil structure as well. Based on the test results and the criterion proposed by Wang Wen-shao, a liquefaction prediction method is suggested.