花岗岩风化土与废弃轮胎混合物力学特性研究

废旧轮胎的治理是一个世界性的难题，而将废旧轮胎应用于岩土工程加固中则为其污染治理提供了一个行之有效的手段。为了进一步研究废旧轮胎对土体的加固机制并应用到实际工程中，主要选取了全风化花岗岩砂颗粒和加工后的废旧轮胎（包括颗粒型和长条型）的混合体作为研究对象，通过一系列不同竖向压力下的一维压缩试验，详细研究不同橡胶含量配比、不同形态下的橡胶-砂混合体的受压力学特性，并创新性地探讨了橡胶颗粒对砂颗粒在压缩过程中破碎行为的影响。试验结果表明，所有橡胶-砂混合体在较高压力作用下都能收敛到一条直线，即存在唯一的标准压缩线；随着橡胶含量增加到大于20%，混合物的压缩和卸载回弹量均明显增加，而这种特性不受轮胎颗粒形态的影响。此外，轮胎橡胶含量配比越高，砂颗粒的破碎程度越小，同时，当其中砂颗粒尺寸越小时，整体破碎越少。

Mechanical properties of completely decomposed granite soil and scrap tyre mixtures

It is a challenge to deal with the scrap tyre all over the world. Reusing the scrap tyres in the geotechnical engineering provides an effective way of controlling pollution. The aim of the tests is explore the application of the scrap tyres to improving soils. A series of tests at different high stress levels is conducted on completely decomposed granite (CDG) sand and tyre rubber (granular rubber and rubber fibre) mixtures. The compression behaviour of the mixtures with different rubber percentages and different shapes of tyre rubber particle are analysed. The effect of the rubber particle on the breakage of sand particle in the mixture is investigated during compression. It is concluded that the normal compression line (NCL) can be found in each the mixture. The compression and rebound significantly increase as the rubber percentage is over 20%, which are not affected with the shape of rubber particle. There is less breakage in the mixture with higher rubber contents. Meanwhile, the larger size of the sand particles, the more breakage of the sand in the mixtures.