摘要
废弃轮胎橡胶颗粒轻质混合土(简称RST轻质土)是由原料土、废弃轮胎橡胶颗粒、水泥和水按照一定比例混合而成的。RST轻质土可用于路基填土、管道回填和防止桥头跳车等工程中,因此,研究其在动荷载作用下的变形特性具有重要的理论意义和工程应用价值。首先对RST轻质土的原材料进行了物理性质研究,然后进行了试样配比方案和试验加载方案的设计,最后通过室内动三轴试验研究了围压、橡胶颗粒含量、水泥掺入量对RST轻质土动变形特性的影响规律。研究结果表明:不同围压下RST轻质土的动应力–应变关系呈双曲线,在相同动应力条件下,RST轻质土的动应变随围压和水泥掺入量的增大而减小;在相同应变条件下,RST轻质土的动弹性模量随围压和水泥掺入量的增大而变大,随橡胶颗粒含量的增加而减小,且橡胶颗粒掺入量增多时,d d E-?曲线趋于平缓。
The lightweight soils mixed with rubber chips of scrap tires are concocted from soils, rubber chips of scrap tires, cement and water by appropriate proportions. They are usually used in many engineering practices such as roadbed fills, pipeline backfills and subgrade fills. So it is important to study the deformation characteristics of RST lightweight soils under dynamic loads. Firstly, the physical properties of the ingredient materials in RST lightweight soils are studied. Then, the sample mixture ratio and loading scheme are designed. Finally, the effects of confining pressure, rubber chip content and cement content on the dynamic deformation characteristics of RST lightweight soils are studied through laboratory dynamic triaxial tests. It is shown from the experimental results that the dynamic stress-strain curve of the RST lightweight soils is in a hyperbolic form, and their dynamic strain decreases with the increase of the confining pressure and the cement content under the same dynamic stress. In addition, the dynamic elastic modulus Ed of the RST lightweight soils increases with the increase of the confining pressure and cement content under the same dynamic strain, decreased with the increase of the rubber chips, and the d d E- ? curve tends to be smooth when the content of rubber chips increases.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期874-878,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(41102166)
山东科技大学科研创新团队支持计划项目(2012KYTD104)
山东科技大学杰出青年科学基金项目(2012KYJQ102)
关键词
RST轻质土
变形特性
动应力–应变关系
动弹性横量
动三轴试验
RST lightweight soil
deformation characteristic
dynamic stress-strain curve
dynamic elastic modulus
dynamic triaxial test
