材料期刊网

为研究二灰改良风积砂土在低温条件下的动力参数变化规律,采用改进的Hardin双曲线模型,通过室内冻土动三轴试验,展开不同试验条件下二灰改良风积砂土在负温条件下的动力特性研究.试验结果表明:随掺灰比的增加,改良风积砂土的动剪切模量先升高后下降,改良效果以掺灰比30%~40%为最佳;相同掺灰比下,冻土的动剪切模量随围压和频率的增加而增加,随冻融循环次数和温度的增加而减少.结合试验结果,对负温条件下的二灰改良风积砂土的最大动剪切模量变化规律进行了回归分析,得出最大动剪切模量与围压、频率和温度三者之间的线性方程.该成果可为解决实际工程问题提供科学性参考依据,具有一定的社会经济效益.

In order to study the dynamic characteristics of modified aeolian sand under low temperature, the modified Hardin hyperbola model was used.And this paper was based on the dynamic triaxial test of frozen soil, the dynamic mechanical parameters of lime-fly ash aeolian sand with different experimental conditions under negative temperature were studied.The results show that the dynamic shear modulus of modified aeolian sand increases first and then decreases with the increase of the ash mixing ratio, and the improvement effect is best when the ash content is 30%-40%.Under the same mixing ratio, the dynamic shear modulus of frozen soil increases with the increase of confining pressure and frequency, and decreases with the increase of freezing and thawing cycles and temperature.The maximum dynamic shear modulus of the aeolian sandy soil under negative temperature was regressed by regression analysis.The linear equations of maximum dynamic shear modulus and confining pressure, frequency and temperature are obtained.The results can provide a scientific basis for solving practical engineering problems, and have certain social and economic benefits.