动荷载作用下粉煤灰改良黄土的动应力-应变关系研究
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摘要
基于动三轴试验系统,以素黄土和粉煤灰改良黄土为研究对象,研究了动荷载作用下素黄土和不同掺合比粉煤灰改良黄土的动应力-应变关系,同时对其模型参数、初始动弹性模量和阻尼比进行了对比研究。研究结果表明:(1)素黄土和不同掺合比粉煤灰改良黄土的动应力-应变骨干曲线服从双曲线模型,但模型参数随粉煤灰掺入量的不同而不同。通过研究数据的拟合,初步建立了粉煤灰改良黄土的动应力-应变关系模型参数a、b与粉煤灰掺入量m之间的定量关系。(2)粉煤灰掺入量对粉煤灰改良黄土的初始动弹性模量和阻尼比影响明显,表现出初始动弹性模量随粉煤灰掺入量的增大而增加以及阻尼比明显减小的特性。(3)从土动力学角度出发,定量地给出了最佳灰-土掺合比。
Based on dynamic triaxial test system,taking flyash modified loess as research object,dynamic stressstrain relationships of the modified loess with different mixed ratio of flyash and loess were analyzed. Moreover,the model parameters,initial dynamic elastic modulus and damping ratio of the modified loess were comparatively researched. The results show that:( 1) the dynamic stress-strain skeleton curves of plain loess and modified loess with different mixed ratio of flyash and loess obey hyperbolic model,however,the model parameters change with mixed content of flyash content. In addition,through research data fitting,the quantitative relationship between the model parameters a,b of dynamic stress-strain curves and flyash content m are established,respectively.( 2) The flyash content of the modified loess has obvious effect on initial dynamic elastic modulus and damping ratio,the characteristics show that initial dynamic elastic modulus increase with increase of flyash content,while damping ratio significantly reduceds with increase of flyash content.( 3) From the perspective of soil dynamics,the best flyash- soil ratio is quantitatively provided.
引文
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