【摘要】：紅土是巖土工程的主要材料之一,泥石流和滑坡也是紅土區(qū)域常見(jiàn)的地質(zhì)災(zāi)害,因此其工程性質(zhì)的研究一直倍受業(yè)界的關(guān)注。紅土主要由氧化鐵、氧化鋁、二氧化鈦和二氧化硅等組成,這些氧化物對(duì)工程的安全有著直接且重要的影響。在國(guó)家自然科學(xué)基金項(xiàng)目的資助下,本文側(cè)重分析和探討堿侵蝕過(guò)程中主要化學(xué)成分與紅土工程性質(zhì)的關(guān)系,取得了較好的效果。將灰色關(guān)聯(lián)模型分析方法引入本次研究范疇,提出了適合紅土中多種氧化物與各工程指標(biāo)的灰色關(guān)聯(lián)求解權(quán)重模型,并利用軟件實(shí)現(xiàn)了求解模型的改善,從而明顯提高了計(jì)算效率和準(zhǔn)確性。將轉(zhuǎn)化率、流失度和劣化貢獻(xiàn)率等相關(guān)概念引入研究過(guò)程,揭示了堿性物質(zhì)侵蝕紅土的機(jī)理,提出了4種主要化學(xué)成分與工程性質(zhì)的量化評(píng)價(jià)指標(biāo),定量確定了紅土各成分變化對(duì)工程指標(biāo)的影響,其中二氧化硅和氧化鋁的含量變化,對(duì)堿蝕紅土的工程性質(zhì)起著關(guān)鍵性作用,但對(duì)不同工程指標(biāo)的劣化貢獻(xiàn)率有所不同。通過(guò)加速壽命試驗(yàn)、顯微觀察、濾出離子檢測(cè),以及現(xiàn)場(chǎng)鉆探試驗(yàn)的結(jié)果分析,弄清了紅土在堿性環(huán)境下的長(zhǎng)期劣化機(jī)理,且試驗(yàn)結(jié)果、原型驗(yàn)證均與化學(xué)分析的結(jié)論一致。提出了堿侵蝕過(guò)程中,紅土各主要氧化物含量改變與工程指標(biāo)變化的趨勢(shì)預(yù)測(cè)模型,并驗(yàn)證了預(yù)測(cè)方法的可行性。所獲成果可供類(lèi)似的研究項(xiàng)目參考,也可廣泛用于紅土工程的安全評(píng)價(jià)、壽命預(yù)測(cè)、以及除險(xiǎn)加固之中。采用影響因子來(lái)預(yù)測(cè)各工程指標(biāo)的變化,不失為一種新思路,并可進(jìn)一步發(fā)展成紅土工程質(zhì)量鑒定的有效方法；依據(jù)紅土各成分發(fā)生變化的量化數(shù)據(jù),可具有針對(duì)性地?cái)M定工程維修方案,從而避免盲目加固造成的浪費(fèi)甚至長(zhǎng)期損傷。
[Abstract]:Red soil is one of the main materials in geotechnical engineering, and debris flow and landslide are also common geological disasters in laterite area, so the research on its engineering properties has been paid more and more attention by the industry. Laterite is mainly composed of iron oxide, alumina, titanium dioxide and silica, which have a direct and important impact on the safety of the project. With the support of the National Natural Science Foundation of China, this paper focuses on the analysis and discussion of the relationship between the main chemical components and the engineering properties of laterite in the process of alkali erosion, and good results have been obtained. The grey relational model analysis method is introduced into this research category, and a grey relational solving weight model suitable for various oxides and engineering indexes in laterite is put forward, and the software is used to improve the solving model. Thus, the calculation efficiency and accuracy are obviously improved. The related concepts such as conversion rate, loss rate and deterioration contribution rate were introduced into the research process, the mechanism of alkaline material erosion of laterite was revealed, and four quantitative evaluation indexes of main chemical components and engineering properties were put forward. The influence of the change of laterite composition on the engineering index was determined quantitatively. The change of silica and alumina content played a key role in the engineering properties of alkali-eroded laterite, but the contribution rate to the deterioration of different engineering indexes was different. Through accelerated life test, microscopic observation, filtration ion detection and field drilling test, the long-term deterioration mechanism of laterite in alkaline environment is clarified, and the experimental results and prototype verification are consistent with the conclusions of chemical analysis. A trend prediction model for the change of main oxide content and engineering index in laterite during alkali erosion is put forward, and the feasibility of the prediction method is verified. The obtained results can be used as a reference for similar research projects, and can also be widely used in safety evaluation, life prediction and danger removal and reinforcement of laterite engineering. It is a new idea to predict the change of each engineering index by using influencing factors, and it can be further developed into an effective method of red soil engineering quality appraisal. According to the quantitative data of the changes of various components of laterite, the engineering maintenance scheme can be drawn up, so as to avoid the waste or even long-term damage caused by blind reinforcement.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P642.132

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