花岗岩残积土崩解试验研究

发布时间：2018-02-26 13:17

本文关键词： 花岗岩残积土吸水试验饱和度崩解　出处：《华南理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：花岗岩残积土的研究相对于其它特殊土来说开展得较晚，早期还将其归入红粘土一类进行研究，使得研究方向受到很大的制约。目前对花岗岩残积土的研究主要集中在风化程度分类、矿物及化学成分、地基承载力、边坡稳定等方面，而对于崩解特性方面的研究还处于初步阶段。因此，研究花岗岩残积土的崩解特性还是一项很有意义的工作。本文仅就花岗岩残积土崩解特性进行试验研究，并通过试验阐述其崩解机理。原状土样的崩解性研究比扰动土样更有意义。但是，作为本课题组此项研究的开始，本论文是专门研究扰动土样的崩解特性。通过对国内已有崩解试验装置的分析，研制了适合本文试验用的崩解试验装置，采用质量法进行测量。本文的主要内容和结果包括： 1、对花岗岩残积土进行吸水试验表明，土体的吸水累计时程曲线可用双曲线模型进行拟合； 2、对不同压实度、不同饱和度的花岗岩残积土扰动样进行崩解特性试验研究，结果表明：花岗岩残积土的压实度对崩解特性的影响较小，饱和度对崩解特性的影响较大； 3、对不同超固结状态的花岗岩残积土扰动样进行崩解试验研究表明，超固结状态对饱和度大的土样影响较大，土样完全崩解时间有较大的延长； 4、对不同聚丙烯纤维（pp纤维）、水泥掺量的花岗岩残积土进行崩解试验结果表明：纤维及水泥的引入能改善土体的凝聚力，使得花岗岩残积土不能完全崩解； 5、对广州红粘土以及砂土的崩解形态对比研究，发现是否存在胶结物对土体的崩解形态有较大影响； 6、通过对比分析花岗岩残积土与红粘土、湿陷性黄土的区别，提出了花岗岩残积土的微结构模型，，并用此模型进行了崩解机理的研究。
[Abstract]:The study of granite residual soil was later than that of other special soils, and it was also classified as red clay in the early stage. At present, the research on granite residual soil is mainly focused on the classification of weathering degree, mineral and chemical composition, bearing capacity of foundation, slope stability and so on. Therefore, it is still a significant work to study the disintegration characteristics of granite residual soil. In this paper, only the disintegration characteristics of granite residual soil are studied experimentally. The mechanism of its disintegration is explained by experiments. The study of disintegration of undisturbed soil samples is more meaningful than that of disturbed soil samples. However, as the beginning of this study by our group, this paper is devoted to studying the disintegration characteristics of disturbed soil samples. A disintegration test device suitable for this test is developed and measured by mass method. The main contents and results of this paper are as follows:. 1. The water absorption test of granite residual soil shows that the cumulative time history curve of soil water absorption can be fitted by hyperbolic model. 2. The disintegration characteristics of granite residual soil with different compaction degree and different saturation are studied. The results show that the compaction degree of granite residual soil has little effect on the disintegration characteristic, and saturation has a great influence on the disintegration characteristic. 3. The disintegrating test of the disturbed samples of granite residual soil in different overconsolidated states shows that the overconsolidated state has a great influence on the soil samples with high saturation, and the complete disintegration time of the soil samples is prolonged. 4. The results of disintegration test of granite residual soil with different PP fiber and cement content show that the introduction of fiber and cement can improve the cohesive force of soil and make the granite residual soil can not be completely disintegrated; 5. Through the comparative study on the disintegration morphology of Guangzhou red clay and sand, it is found that the existence of cement has a great influence on the disintegration morphology of the soil. 6. By comparing and analyzing the difference between granite residual soil and red clay and collapsible loess, the microstructure model of granite residual soil is put forward, and the disintegration mechanism is studied by using this model.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU41

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