本文關(guān)鍵詞： 花崗巖殘積土 吸水試驗(yàn) 飽和度 崩解　出處：《華南理工大學(xué)》2013年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：花崗巖殘積土的研究相對(duì)于其它特殊土來(lái)說(shuō)開(kāi)展得較晚，早期還將其歸入紅粘土一類(lèi)進(jìn)行研究，使得研究方向受到很大的制約。目前對(duì)花崗巖殘積土的研究主要集中在風(fēng)化程度分類(lèi)、礦物及化學(xué)成分、地基承載力、邊坡穩(wěn)定等方面，而對(duì)于崩解特性方面的研究還處于初步階段。因此，研究花崗巖殘積土的崩解特性還是一項(xiàng)很有意義的工作。本文僅就花崗巖殘積土崩解特性進(jìn)行試驗(yàn)研究，并通過(guò)試驗(yàn)闡述其崩解機(jī)理。 原狀土樣的崩解性研究比擾動(dòng)土樣更有意義。但是，作為本課題組此項(xiàng)研究的開(kāi)始，本論文是專門(mén)研究擾動(dòng)土樣的崩解特性。通過(guò)對(duì)國(guó)內(nèi)已有崩解試驗(yàn)裝置的分析，研制了適合本文試驗(yàn)用的崩解試驗(yàn)裝置，采用質(zhì)量法進(jìn)行測(cè)量。本文的主要內(nèi)容和結(jié)果包括： 1、對(duì)花崗巖殘積土進(jìn)行吸水試驗(yàn)表明，土體的吸水累計(jì)時(shí)程曲線可用雙曲線模型進(jìn)行擬合； 2、對(duì)不同壓實(shí)度、不同飽和度的花崗巖殘積土擾動(dòng)樣進(jìn)行崩解特性試驗(yàn)研究，結(jié)果表明：花崗巖殘積土的壓實(shí)度對(duì)崩解特性的影響較小，飽和度對(duì)崩解特性的影響較大； 3、對(duì)不同超固結(jié)狀態(tài)的花崗巖殘積土擾動(dòng)樣進(jìn)行崩解試驗(yàn)研究表明，超固結(jié)狀態(tài)對(duì)飽和度大的土樣影響較大，土樣完全崩解時(shí)間有較大的延長(zhǎng)； 4、對(duì)不同聚丙烯纖維（pp纖維）、水泥摻量的花崗巖殘積土進(jìn)行崩解試驗(yàn)結(jié)果表明：纖維及水泥的引入能改善土體的凝聚力，使得花崗巖殘積土不能完全崩解； 5、對(duì)廣州紅粘土以及砂土的崩解形態(tài)對(duì)比研究，發(fā)現(xiàn)是否存在膠結(jié)物對(duì)土體的崩解形態(tài)有較大影響； 6、通過(guò)對(duì)比分析花崗巖殘積土與紅粘土、濕陷性黃土的區(qū)別，提出了花崗巖殘積土的微結(jié)構(gòu)模型，，并用此模型進(jìn)行了崩解機(jī)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.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU41

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