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本试验使用GDS动三轴仪,对赤泥黄土复合试样、赤泥试样、黄土试样进行了动三轴试验,研究了赤泥、黄土及赤泥黄土复合试样的部分动参数,分析了赤泥含量、围压的影响,旨在探索赤泥黄土复合体用于路基材料的工程性能.试验结果表明:赤泥、赤泥黄土复合试样的应力应变σd~εd、应变动弹模Ed~εd、应变阻尼比λ~εd关系曲线有与黄土相似的特性变化规律,只是在数值上有所差异.赤泥的掺入使复合体强度和刚度明显增强,且与掺入量m成正比关系.且随着赤泥掺入量的增大,动弹模Ed和最大动弹模Edmax都有明显的增强,但不同的围压下增强程度不同.复合试样的阻尼比λ随着赤泥含量的增多,相应的阻尼比较小,而随着围压增大,赤泥含量的影响将变小.围压对各参数的影响:同一应变下,应力σd随着围压增大而增大,动弹模Ed随着围压增大而增大,阻尼比λ前期随着围压增大而增大,后期则随着围压增大而减小.试验得出结论:赤泥黄土复合试样的最佳配比为赤泥∶黄土=3∶7.
In this experiment, the dynamic triaxial test was carried out on the red mud loess composite sample, red mud sample and loess sample using the GDS dynamic triaxial apparatus. Some dynamic parameters of red mud, loess and red mud loess composite samples were studied. The effects of red mud content and confining pressure were analyzed in order to explore the engineering properties of red mud loess composite for roadbed materials.The results show that the stress and strain σd ~ εd of red mud and red mud loess composite samples, Ed ~ εd and strain-damping ratio λ ~ εd have the similarities with the loess, but they differ only in value.The incorporation of red mud significantly enhanced the strength and stiffness of the composites, And with the increase of the amount of red mud, Ed and the maximum dynamic modulus Edmax significantly enhanced, but under different confining pressure enhancement degree.The damping ratio λ composite sample with red mud With the increase of confining pressure, the influence of confining pressure will be smaller.The influence of confining pressure on each parameter: under the same strain, the stress σd increases with the increase of confining pressure , The moving modulus Ed increases with the confining pressure and the damping ratio λ increases with the confining pressure in the early stage Is increased, the later decrease with increasing confining pressure test conclusion: the best ratio of red mud loess composite sample is red mud: loess = 3:7.