铁尾矿粉改良水泥土的强度与动力特性试验研究

发布时间：2018-01-12 06:14

本文关键词：铁尾矿粉改良水泥土的强度与动力特性试验研究　出处：《硅酸盐通报》2017年11期 　论文类型：期刊论文

更多相关文章： 水泥土 尾矿粉 动剪模量 阻尼比

【摘要】：为提高水泥改良土强度,验证尾矿粉能够起到对水泥土的增强效果,对已用水泥改良过的路基土,在尾矿粉掺入量不同的条件下,经改良后水泥土的强度特性,以及对被最佳掺量的尾矿粉改良后的水泥土,在围压和频率不同的条件下进行动力特性的试验研究,制备了不同尾矿粉掺量(0%、2%、4%、6%、8%、10%)的试验土样进行无侧限抗压强度试验和动三轴试验;试验结果表明:随着尾矿粉掺入量的增加,无侧限抗压强度先增大后减小,土的应力应变曲线先急剧增加达到峰值后逐渐趋于平缓。当尾矿粉掺量达到最佳时,分析不同围压和不同频率的条件下G/G_(max)~γ、λ~γ变化规律。对于同一动剪应变幅,动剪模量比随围压的增加而增大。阻尼比随动剪应变幅的增大而增大,随围压的增大而减小。G/G_(max)~γ、λ~γ关系受频率影响不太敏感,都集中于一狭小范围。该试验能够提高水泥土强度的尾矿粉最佳掺量为6%。
[Abstract]:In order to improve the strength of cement soil, verification of tailings powder can play to enhance the effect of the cement soil, the subgrade soil with cement modified, tailings powder incorporation in different conditions, the strength characteristics of modified cement soil, and the soil cement tailings powder modified optimum dosage after experimental study on the dynamic characteristics, the confining pressure and frequency under different conditions, different tail slag content were prepared (0%, 2%, 4%, 6%, 8%, 10%) of the test samples of unconfined compressive strength test and three triaxial test; test results show that with the increase of tailings powder the amount of non compressive strength increases first and then decreases, the stress-strain curve of soil increased sharply after the peak gradually leveled off. When the tail slag content to achieve the best, analysis of different confining pressure and different frequency under the condition of G/G_ (max) ~ ~ gamma gamma, lambda for law changes. The same dynamic shear strain, The dynamic shear modulus ratio increases with the increase of confining pressure. The damping ratio with dynamic shear strain increases with the increase of confining pressure decreases.G/G_ (max) ~ ~ gamma gamma, lambda relationship affected by frequency not too sensitive, are concentrated in a narrow range. The test can improve the best mixing tailings powder the amount of cement soil strength is 6%.

【作者单位】：辽宁工程技术大学土木工程学院;
【基金】：国家安监总局项目(05 05 079) 辽宁省教育厅项目(1.2011048)
【分类号】：TU41
【正文快照】： 1引言目前,随着我国高速公路和铁路的快速发展,其自身的安全性和可靠性备受关注。想要使列车高速安全平稳地运行,必须要有稳定与平顺线路。铁轨下基础的道床和路基的材料是散体材料,而且散体材料极易出现变形,并且抵抗振动的能力比较弱,所以道床和基床就成为了铁路线路结构中

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