【摘要】 通过重塑非饱和试件的动三轴试验,开展了粉煤灰改性黄土的动力特性研究。探讨了动荷载作用下粉煤灰改性黄土的动应力-动应变关系,考察了粉煤灰掺入量对改性黄土动本构关系、动弹性模量和阻尼比的影响。研究结果表明,对应于不同粉煤灰掺入量的改性黄土其动本构关系均服从双曲线模型,但试验参数a、b均随粉煤灰掺入量的增大而减小。动弹性模量随着粉煤灰掺入量的增加而增加,而阻尼比明显减小。粉煤灰改性黄土的最佳粉煤灰含量在15%～20%之间。更多还原

【Abstract】 Based on the dynamic triaxial tests on disturbed unsaturated samples,a study on the dynamic characteristics of modified fly ash loess is carried out.The dynamic stress-strain relationship of fly ash loess under loading function is discussed.The influence of adding amount of fly ash on the dynamic constitutive relationship,dynamic modulus of elasticity and damping ratio of the modified loess is analyzed.The results show that the dynamic constitutive relationship of the modified loess with different adding amounts of fly ash obeys the hyperbolic equation.The test constants a and b decrease with the increase of the adding amount of fly ash.The dynamic modulus of elasticity increases with the increase of fly ash amount,but the damping ratio noticeably reduces.The optimal content of fly ash of the fly ash-modified loess is 15%~20%.更多还原