赤泥作为路基材料的动力性能研究

发布时间：2018-04-30 17:36

本文选题：赤泥 + 含水量　；参考：《太原理工大学》2017年硕士论文

【摘要】：本文对赤泥作为路基材料的应用进行了研究。试验使用GDS动三轴仪,模拟交通荷载作用,在大量室内试验的基础上,对山西地区的赤泥及赤泥黄土复合体在动荷载作用下的动力特性进行了较为系统的研究。研究内容主要包括不同含水量赤泥在不同围压下的动力学特性、不同配比的赤泥黄土复合体在不同围压下的动力学特性。研究的动力学特性参数主要有动应变、动应力、动孔隙水压力、动强度、动弹模及阻尼比。结合典型的黄土研究理论和方法,分析了含水量、赤泥含量、围压分别对各动力特性的影响。本文取得了如下主要成果和结论:(Ⅰ)不同含水量赤泥试样在不同围压下的动力性能不同,同一试样不同阶段的动力性能也不相同,但是表现出的规律有相似性。1、随着动应变的增大,动应力、动孔隙水压力增大,直到试样破坏;动弹模减小;含水量为18%的试样阻尼比先减小后增大,而其余含水量试样则一直减小。2、含水量对动力特性的影响:随着含水量的增大,孔隙水压力先减小后增大,动强度先增长后减小,在含水量为24%时达到最大值,在含水量为36%时最小;最大动弹模E_(dmax)减小;最大阻尼比λmax减小。3、围压对动力特性的影响:随着围压增大,动孔隙水压力、动强度、最大动弹模E_(dmax)、最大阻尼比λmax均增大。4、当赤泥含水量为18%时,各种动力参数均表现良好,所以赤泥作为路基材料的合适含水量为18%。(Ⅱ)不同配比赤泥黄土复合体在不同围压下的动力性能表现为相似的变化规律,只是在数值上有所差异。1、随着动应变的增大,动应力、动孔隙水压力增大,直到试样破坏;动弹模减小;阻尼比增大;2、赤泥含量对动力特性的影响:随着赤泥含量的增加,动孔隙水压力减小;动强度出现上下波动趋势,赤泥含量为30%和70%均为阶段峰值;最大动弹模E_(dmax)与动强度变化基本一致,其中赤泥含量为30%、70%、100%为阶段峰值;最大阻尼比λmax则与动弹模正好相反。3、围压对动力特性的影响:随着围压增大,动孔隙水压力、动强度、最大动弹模E_(dmax)增大,最大阻尼比λmax先增大后减小。4、赤泥黄土复合体的最优配比:当赤泥含量为30%时,试块既有较大的强度,又有较好的塑性,为较为理想的配比。(Ⅲ)赤泥黄土复合体固化原理分析:当赤泥含量较少时,赤泥对黄土起到固化作用,当赤泥含量较多时,黄土影响赤泥的水化作用。当赤泥含量为30%时,赤泥对黄土的固化效果最好;赤泥含量为70%时,黄土对赤泥水化作用的促进效果最好。
[Abstract]:The application of red mud as subgrade material is studied in this paper. On the basis of a large number of indoor tests, the dynamic characteristics of red mud and red mud loess complex in Shanxi area under dynamic load were studied systematically by using GDS dynamic triaxial instrument to simulate traffic load. The main contents of the study include the dynamic characteristics of red mud with different water content under different confining pressures and the dynamic characteristics of red mud loess complex with different proportions under different confining pressures. The dynamic characteristic parameters are mainly dynamic strain, dynamic stress, dynamic pore water pressure, dynamic strength, dynamic modulus and damping ratio. Combined with typical loess research theory and method, the effects of water content, red mud content and confining pressure on the dynamic characteristics are analyzed. The main results and conclusions obtained in this paper are as follows: (I) the dynamic properties of red mud samples with different water contents are different under different confining pressures, and the dynamic properties of the same samples are different at different stages. With the increase of the dynamic strain, the dynamic stress and the dynamic pore water pressure increase until the specimen is destroyed, the dynamic modulus decreases, and the damping ratio of the sample decreases first and then increases when the moisture content is 18%. The effect of water content on the dynamic characteristics of the other water samples is as follows: with the increase of water content, the pore water pressure decreases first and then increases, and the dynamic strength increases first, then decreases, and reaches the maximum value when the water content is 24. The maximum damping ratio 位 max decreases .3.The effect of confining pressure on dynamic characteristics is as follows: with the increase of confining pressure, dynamic pore water pressure, dynamic strength, When the water content of red mud is 18, all kinds of dynamic parameters are good, and the maximum damping ratio 位 max increases by 0.4.When the water content of red mud is 18, all kinds of dynamic parameters are good. So the suitable moisture content of red mud as subgrade material is 18. (II) the dynamic performance of red mud loess complex with different proportions under different confining pressures shows a similar change law, but there is a difference in numerical value. 1, with the increase of dynamic strain, dynamic stress, The dynamic pore water pressure increases until the specimen is destroyed; the dynamic modulus decreases; the damping ratio increases by 2; the effect of the red mud content on the dynamic characteristics: with the increase of the red mud content, the dynamic pore water pressure decreases; the dynamic strength fluctuates up and down. The red mud content of 30% and 70% is the peak value of the stage, and the maximum dynamic modulus Emax) is basically consistent with the change of dynamic strength, and the red mud content of 30% 70% is the peak value of the stage. The maximum damping ratio 位 max is opposite to the dynamic modulus. 3. The influence of confining pressure on dynamic characteristics: with the increase of confining pressure, dynamic pore water pressure, dynamic strength, maximum dynamic modulus E max), The maximum damping ratio 位 max increases first and then decreases .4.The optimum ratio of red mud and loess complex is as follows: when the content of red mud is 30, the sample has both larger strength and better plasticity. For the ideal ratio. (III) the solidification principle of the red mud loess complex: when the red mud content is low, the red mud plays a solidification role on the loess, and when the red mud content is more, the loess affects the hydration of the red mud. When the content of red mud is 30, the solidification effect of red mud on loess is the best, and when the content of red mud is 70, the promoting effect of loess on the hydration of red mud is the best.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U414

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