赤泥黄土复合体的动参数试验研究

发布时间：2018-03-29 14:09

本文选题：土的动参数　切入点：黄土　出处：《东南大学学报(自然科学版)》2016年S1期

【摘要】：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.
[Abstract]:This experiment using GDS three triaxial apparatus, the red mud composite sample loess, loess samples were red mud samples, three triaxial test, the aerodynamic parameters of red mud, loess and red mud loess composite sample, analyzed the content of red mud, the influence of confining pressure, in order to explore the red mud loess composite used for engineering properties of roadbed material. The test results showed that the red mud, mud loess composite sample stress strain d~ sigma epsilon D, strain modulus Ed~ epsilon D strain, damping ratio curve ~ d relation has epsilon characteristics and loess are similar, but differ in value. The incorporation of red mud composite strength and stiffness significantly enhanced incorporation and M proportional relationship. And with the increasing of the doping amount of red mud, the dynamic elastic modulus Ed and maximum modulus Edmax were obviously enhanced, but different confining pressure increased in different degrees. The damping ratio of composite specimens with red mud content increasing. More, the corresponding damping is relatively small, and with the increase of confining pressure, the effect of red mud content will be smaller. The effect of confining pressure on the parameters of the same strain, the D stress increases with the increase of confining pressure, dynamic elastic modulus Ed increases with the increase of confining pressure, the damping ratio of the early with the increase of confining pressure the latter increases, decreases with the increase of confining pressure. The test concluded that the optimum proportion of red mud loess composite sample for red mud: Loess =3: 7.

【作者单位】：山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室;太原理工大学建筑与土木工程学院;
【基金】：黄土地区公路建设与养护技术交通行业重点实验室开放基金资助项目(KLTLR-Y13-4) 山西省科技创新重点团队建设计划资助项目(2014131019)
【分类号】：TU444

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