【作者】 李庆冰；

【导师】 王凤池；

【作者基本信息】 沈阳建筑大学 ， 结构工程， 2011， 硕士

【摘要】 随着国内外汽车工业的发展,废弃轮胎带来的废橡胶成为当前主要的固体废弃物之一,其利用问题已引起人们广泛的关注。将粉碎后的废橡胶颗粒应用于水泥土中,是一种高效的利用废橡胶的方式。橡胶水泥土(RCS)是将土、橡胶粉、水泥等强制搅拌,在一系列物化反应后形成的新型水泥土复合体。本文在前人的试验基础上改进了橡胶水泥土水泥土复合试样的制备方法,通过不排水动三轴试验详细地分析了应变、围压、置换率以及橡胶粉掺入比四个主要因素对复合试样动力特性的影响并分析了内在机理,根据有关数据,到了较为完整的复合试样的动力变形曲线,通过回归分析方法,得到了相应的拟合公式,并以此用于指导工程抗震设计,具有重要的理论意义和巨大的工程实用价值。橡胶水泥土动强度的试验研究:在橡胶水泥土动强度试验中,复合试样轴向动应变与振动次数的关系:即使试样配比不同时,动应变与振动次数的关系曲线大致上是相同的;动强度随着围压的增大而增大;在围压不变的情况下,动强度随着橡胶粉掺入比的增加而降低,但却随着置换率的增大而增大。橡胶水泥土动弹性模量和阻尼比的试验研究:橡胶水泥土复合试样的动弹性模量与阻尼比和应变的相关曲线,和水泥土的有关曲线形状基本一致,只是在数值上有大小不同;试验结论表明,随着围压的增大,动弹性模量增大而阻尼比减小;随着橡胶粉掺入比的增加,动弹性模量减小而阻尼比增大;随着置换率的增大,动弹性模量增大而阻尼比减小。并且提出了计算橡胶水泥土复合试样动弹性模量和阻尼比的简单方法。通过本次试验,得出一些橡胶水泥土复合试样动力特性的规律,为今后类似工程合理地进行地基处理和结构抗震设计提供了良好的参考作用。更多还原

【Abstract】 With the development of the automobile industries at home and abroad, the growing amount of waste rubber produced from scrap tires has resulted in an environmental problem. The utilization of scrapped rubber tyre in cement-soil has attracted attention with both energy crisis and the rise of environmental consciousness. Rubberized cement-soil (RCS for short) is a new type cement-soil, which is made by forced mixing soft soil, crumb rubber, cement and so on after a serial of physical and chemical reactions.The preparation method of RCS clay samples is modified based on former researches. The variation laws of dynamic elastic modulus and damping ratio for composite sample of RCS are studied experimentally by means of dynamic triaxial test. Emphasis is laid on the influence of confining pressure and rubber powder content ratio and replacement ratio and analysis their inner mechanisms, which led to several conelusions useful to seismic design in engineering practiee.Test study on dynamic strength of RCS: The relationship of RCS is similar to those of pure clay. Test results indicated that dynamic strength decreases as the confining pressure increases; dynamic strength increases as the rubber powder ratio increases; dynamic strength decreases as the replacement ratio increases.Test study on dynamic elastic modulus and damping ratio of RCS: The relationship of RCS is similar to those of pure clay. Test results indicated that dynamic elastic modulus increases and damping ratio decreases as the confining pressure increases; dynamic elastic modulus decreases and damping ratio increases as the rubber powder ratio increases; dynamic elastic modulus increases and damping ratio decreases as the replacement ratio increases. And a simple for calculating the dynamic elastic modulus and damping ratio is proposed.Some conclusions of RCS are summarized by dynamic triaxial tesx, which will be a useful referce to reasonable foundations treatment in similar engineering practice afterword.更多还原