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在均等固结与非均等固结两种情况下,通过改变围压、轴压取值,进行了多组的粉质粘土的动剪切模量与阻尼比的相关试验.试验结果得出,在均等固结条件下,施加围压、轴压越大,其动剪切模量比数值越大;轴压、围压分别由100 k Pa增加到200 k Pa、300 k Pa,动剪切模量比随之增大,增加幅值为10%左右;阻尼比受围压、轴压影响的变化规律性不明显.在非均等固结条件下,固结比越大,其动剪切模量比数值越大;固结比数值从1增加到2,其动剪模量比增加幅值为30%左右;固结比数值从2增加到3,其动剪模量比增加幅值为10%左右;随着固结比的增加,增幅减小;其阻尼比受固结比影响的变化规律性不明显.其研究成果可为土动剪切试验的固结参数正确取值提供参考依据,并为岩土动力学特性科研工作提供基础试验资料.
In the two cases of equal consolidation and non-uniform consolidation, the correlation tests of dynamic shear modulus and damping ratio of multiple sets of silty clay were carried out by changing the confining pressure and axial compression value.Experimental results show that, Under the condition of equal consolidation, the confining pressure is increased. The larger the axial compression is, the larger the dynamic shear modulus is. The axial compression and confining pressures increase from 100 kPa to 200 kPa and 300 kPa respectively. The modulus ratio increases with an increase of about 10%, and the change law of damping ratio is not obvious under the influence of confining pressure and axial pressure.Under the unequal consolidation condition, the larger the consolidation ratio, the more the dynamic shear force Modulus greater than the value of the larger the value of the consolidation ratio increased from 1 to 2, the dynamic shear modulus increased amplitude of about 30%; consolidation ratio increased from 2 to 3, the dynamic shear modulus than increased amplitude Is about 10% .With the increase of consolidation ratio, the increase decreases, and the regularity of its damping ratio is not obvious under the influence of consolidation ratio.The research results can provide the correct values of the consolidation parameters of soil dynamic shear test Reference basis, and for the geotechnical properties of scientific research to provide basic test data.