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利用GDS共振柱试验系统对非饱和膨胀土进行动力特性试验,研究自由膨胀率不同时非饱和膨胀土动剪切模量和阻尼比的变化规律,以及动剪切模量和阻尼比随动剪切应变增加的变化趋势。结果表明:自由膨胀率增大时,非饱和膨胀土动剪切模量随之增大,最大动剪切模量增大,阻尼比也随之增大;随着动剪切应变的增加,非饱和膨胀土动剪切模量减小,但阻尼比随之增加;当剪切应变较大时,动剪切模量随动剪切应变增加而下降的幅度变大,阻尼比的增幅亦变大。
The dynamic characteristics of unsaturated expansive soil was tested by GDS resonance column test system to study the variation of dynamic shear modulus and damping ratio of unsaturated expansive soil with different free expansion rates. Cut the trend of increasing strain. The results show that when the free expansion ratio increases, the dynamic shear modulus of unsaturated expansive soil increases, the maximum dynamic shear modulus increases, and the damping ratio also increases. With the increase of dynamic shear strain, The dynamic shear modulus of unsaturated expansive soil decreases, but the damping ratio increases. When the shear strain is larger, the dynamic shear modulus increases with the increase of the dynamic shear strain and the amplitude of the drop decreases. The increase of the damping ratio also increases Bigger.