土体动剪切模量测定及非线性拟合方法研究

Testing and nonlinear fitting of dynamic shear modulus of soil

共振柱试验可以测定较小应变(10-6~10-4)范围内土体的动剪切模量,动三轴试验可以测定较大应变(10-4~10-2)范围内土体的动剪切模量。将两种试验方法结合起来共同测定土体的动剪切模量,可提供10-6~10-2应变范围内土体的动剪切模量值,从而可为各类土体的动力分析提供合理的动剪切模量值,可避免以往只用一种试验方法并外推给定整个动应变范围内土体动剪切模量值的不足。文中通过土体动剪切模量的联合测定,研究了不同拟合方法对拟合结果的影响。

Soil dynamic shear modulus in the shear strain range of 10-6~10-4 can be obtained by the resonant column test,and it can be obtained by the cyclic triaxial test in the shear strain range of 10-6~10-2.The dynamic shear modulus in the shear strain range of 10-6~10-2 can be obtained by combining two kinds of test methods,which can give us reasonable dynamic shear modulus in the soil dynamic analysis,which also can improve the shortcomings that we get the modulus by extrapolation based on the limited data.In this paper,combined test method of dynamic shear modulus of soil is provided,and the different fitting results are also studied in it.