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利用装有压电陶瓷弯曲元的双向振动三轴仪对饱和黄土进行了循环荷载试验,并根据静力固结条件下黄土的动剪模量发展规律建立了基于哈定方程的拟合曲线;将循环荷载作用下的动剪模量与静力固结下的动剪模量进行了对比研究,并根据轴向应变的发展规律,确定了以上2种条件下动剪模量产生差异的原因:试样结构性破坏,土颗粒重排列,土体具有很高的敏感性。对于振动过程中的暂停对试验的影响进行了研究,认为由于暂停时间很短,可以忽略这种影响。在振动结束后,对试样在原压力下重新进行固结,结果表明,固结完成后,试样的动剪模量增大,且增大幅度随着密度的增加而变小。
The cyclic loading tests on saturated loess were carried out by means of a two - way vibrating triaxial apparatus equipped with bended elements of piezoelectric ceramics. According to the law of dynamic shear modulus development of loess under static consolidation condition, a fitting curve based on Hadinger ’s equation was established. The dynamic shear modulus under cyclic loading is compared with the dynamic shear modulus under static consolidation. According to the development of axial strain, the reason for the difference of dynamic shear modulus under the above two conditions is determined : Sample structural damage, soil particles rearranged, the soil has a high sensitivity. The effect of suspension on vibration during the test was studied and it is considered that this effect can be neglected due to the short pause time. After the vibration is finished, the sample is re-consolidated under the original pressure. The results show that the dynamic shear modulus of the sample increases after the consolidation, and the increase decreases with the increase of the density.