橡胶砂泊松比试验研究

发布时间：2018-01-28 11:48

本文关键词： 土力学橡胶砂泊松比三轴试验应力水平经验公式　出处：《岩石力学与工程学报》2017年S1期 　论文类型：期刊论文

【摘要】：应用三轴试验方法,研究10种不同配比橡胶砂在4种围压下的泊松比变化规律,结果表明:(1)较低橡胶含量的橡胶砂泊松比变化规律与纯砂类似,由于剪胀效应的存在,泊松比出现大于0.5的情况,中等橡胶含量橡胶砂的泊松比随轴向应变或应力水平的增加而呈单调增加趋势,较高橡胶含量橡胶砂的泊松比呈先减小后增加的趋势;(2)橡胶砂初始泊松比随橡胶含量呈V型变化,先减小后增加,临界橡胶含量在35%~40%范围;(3)在破坏阶段橡胶砂泊松比趋于0.5;(4)围压对橡胶砂泊松比变化规律影响甚小。橡胶砂泊松比上述变化规律的主要力学机制是由于不同组分特征的橡胶颗粒与砂颗粒在混合物中形成不同的受力骨架。最后,提出橡胶砂泊松比随应力水平变化的经验估计式,与试验结果的对比证明其能反映橡胶砂泊松比的主要变化规律。
[Abstract]:The variation law of Poisson's ratio of 10 kinds of rubber sand with different proportions under four confining pressures was studied by using triaxial test method. The results show that the change law of Poisson's ratio of rubber sand with lower rubber content is similar to that of pure sand. Due to the existence of shear expansion effect, Poisson's ratio is larger than 0.5, and the Poisson's ratio of rubber sand with medium rubber content increases monotonously with the increase of axial strain or stress level. The Poisson's ratio of rubber sand with higher rubber content decreases first and then increases. (2) the initial Poisson's ratio of rubber sand changes with the rubber content, which decreases first and then increases, and the critical rubber content is in the range of 3540%; (3) the Poisson's ratio of rubber sand tends to be 0.5 in the failure stage; 4). The influence of confining pressure on the change of Poisson's ratio of rubber sand is very small. The main mechanical mechanism of the change law of rubber sand's Poisson's ratio is that the rubber particles with different component characteristics and sand particles form different mechanical framework in the mixture. Finally. An empirical estimation formula for the change of Poisson's ratio of rubber sand with stress level is put forward. The comparison with the experimental results shows that the formula can reflect the main changing law of the Poisson's ratio of rubber sand.
【作者单位】：湖南工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(51108177) 湖南省自然科学基金资助项目(10JJ4040)~~
【分类号】：TU41
【正文快照】： 近年来随着全球汽车总量的增加,废弃轮胎的数量也日渐增多,造成的环境污染日益严重,如何对废旧橡胶轮胎进行循环再利用已经成为影响社会经济发展和生态环境保护的一个热门问题。已有研究表明,由于废旧轮胎橡胶颗粒具有密度小、耐久性好、在不见光情况下老化慢等特点,是一种可

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