轮胎碎片-砂混合土抗剪性能优化试验研究

Shear performance optimizing of tire shred-sand mixture

废旧轮胎碎片-砂混合土有诸多优点,作为轻质填料目前已有应用。对轮胎碎片-砂混合土进行系列剪切试验,探讨碎片含量和纵横比、密实度等不同因素对混合土抗剪性能的影响规律。研究结果表明,加入轮胎碎片后,混合土摩尔-库仑包线呈非线性,且随碎片含量增加,抗剪强度、内摩擦角相应增加,非线性特征更明显。通过优化轮胎碎片纵横比、增加碎片含量和密实度,混合土内摩擦角可以增加8%～89%。其他条件相同时,单纯改变轮胎碎片宽度对抗剪性能影响不明显,但纵横比影响很大,对于给定宽度的轮胎碎片,仅有惟一的某个长度值使得混合土内摩擦角达到最大,且最大值可达65°。

There are so many merits of waste tire shred-sand mixture. Presently, it has been used as light filling. Series of shear tests of tire shred-sand mixture have been done; and the influence of different factors on shear performance is discussed, such as shred content, aspect ratio and compactness. The results show that it is nonlinear of the mixture Mohr-Coulomb envelope. The shear strength and friction angle increase with the tire shred content increase and the nonlinear behavior becomes more evident as the addition of the tire shreds. The friction angle of the mixture can increase by 8%-89% by means of optimizing shred aspect ratio, shred content and compaction. There is very little effect of shred width on shear performance. But the aspect ratio of the shred has obvious influence on shear behavior at other things being equal. There is one and only length for a fixed width of the tire shred, which can make the maximum friction angle of 65 .