水泥土小应变动力特性试验研究

通过GDS共振柱,研究了不同围压、不同掺和比对水泥软黏土小应变动力特性(动剪切模量和阻尼比)的影响,得到了水泥软黏土小应变动力特性的变化规律。随着应变幅值的增加,动剪切模量逐渐衰减。最大动剪切模量随有效围压的增大而线性增大;在相同应变水平下,随着水泥土掺和比增大,有效围压对动剪切模量的影响逐渐减小。随着应变幅值的增加,阻尼比逐渐增大。相同应变水平下,试样的阻尼比随有效围压的增大而有轻微地减小。水泥掺和比对阻尼比的影响较小,随着水泥掺和比的提高,相同应变水平下试样的阻尼比有略微地升高。与动剪切模量相比阻尼比对有效围压和掺和比的变化不敏感。

EXPERIMENTAL STUDY ON SMALL-STRAIN DYNAMIC PROPERTIES OF CEMENTED SOIL

The influence of confining and mixing ratio on small-strain dynamic properties(dynamic shear modulus and damping ratio)of cemented soft soil was studied through GDS resonance column,and the changing regularity of small-strain dynamic properties of cemented soft soil was obtained.The dynamic shear modulus decreased with the increased of strain amplitude.The maximum dynamic shear modulus increased linearly with the increase of confining pressure,the influence of confining pressure on dynamic shear modulus decreased with the increasd of mixing ratio under the same strain amplitude.The damping ratio increases with the increase of strain amplitude.Damping ratio decreased slightly with the increase of confining pressure.The influence of mixing ratios was damping ratio was small,damping ratio increased slightly with the increase of mixing ratio under the same strain amplitude.Comparing with the dynamic shear modulus,damping ratio was unsensitive to the variation of confining pressure and mixing ratio.