论文部分内容阅读
废弃轮胎橡胶颗粒轻质混合土(RST轻质土)是一种由原料土、废弃轮胎橡胶颗粒、水泥和水混合而成的新型轻质填筑材料。它不仅可以减小资源浪费和环境污染,还具有轻质高强的优点,可以改善填土的工程性质。为了研究其抗剪强度特性,对不同配合比的废弃轮胎橡胶颗粒轻质混合土,进行常规三轴固结不排水剪切试验,得出了固结不排水剪破坏形态及应力应变曲线、孔压应变曲线形态。结果表明随着橡胶颗粒含量的增加,RST轻质土的应力应变曲线从软化型向硬化型过渡。试验还得出了材料配比对固结不排水剪切试验下RST轻质土的抗剪强度、抗剪强度指标及孔隙水压力系数的影响规律,并从强度机理和土体骨架结构的角度分别解释了材料配比影响抗剪强度指标和孔隙水压力系数的原因,结果表明RST轻质土的强度可以用灰土比进行线性拟合。研究成果可作为进一步研究这种新材料本构关系的依据。
Abandoned tires Rubber particles Lightweight mixed soil (RST light soil) is a new type of light weight fill material made from raw soil, waste tire rubber particles, cement and water. It not only reduces waste of resources and environmental pollution, but also has the advantages of lightweight and high strength, can improve the engineering properties of filling. In order to study the characteristics of shear strength, the three-axis consolidation undrained shear tests were carried out on lightweight mixed soil of rubber tires with different proportions, and the failure morphology and stress-strain curves of consolidated undrained shear were obtained. Compression curve shape. The results show that with the increase of the content of rubber particles, the stress-strain curve of RST light soil transition from softening to hardening. The influence of material ratio on the shear strength, shear strength index and pore water pressure coefficient of RST lightweight soil under consolidation undrained shear test was also obtained. From the point of strength mechanism and soil skeleton structure The reasons for the influence of material ratio on shear strength index and pore water pressure coefficient are explained respectively. The results show that the strength of RST light soil can be fitted linearly with lime soil ratio. The research results can be used as a basis for further research on the constitutive relationship of this new material.