固结比对粉质粘土动力学特性影响的试验研究

Testing study of effects of consolidation ratio of soils on dynamic characteristics

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 unequal consolidation,related tests of dynamic shear modulus and damping ratio of multi-group of silty clay are carried out by changing values of confining pressure and axial pressure. Experimental results as follows： Under the condition of equal consolidation, the greater confining and axial pressure,the greater values of dynamic shear modulus ratio; confining and axial pressure increased from 100 k Pa to 200 k Pa,300 k Pa,the dynamic shear modulus ratio increased with the increase of 10%; the damping ratio is not obvious. Under the condition of unequal consolidation,the greater consolidation ratio,the greater values of dynamic shear modulus ratio the axial compression; consolidation ratio increased from 1 to 2,the dynamic shear modulus ratio increased with the increase of 30%;consolidation ratio increased from 2 to 3, the dynamic shear modulus ratio increased with the increase of 10%; damping ratio is not obvious. Research results can provide reference basis for correct value of consolidation parameters of dynamic shear test,and provide basic experimental data for researches on dynamic characteristics of rock and soil.