碱侵蚀过程中红土化学成分与工程性质的关系研究

发布时间：2019-05-25 00:33

【摘要】：红土是岩土工程的主要材料之一,泥石流和滑坡也是红土区域常见的地质灾害,因此其工程性质的研究一直倍受业界的关注。红土主要由氧化铁、氧化铝、二氧化钛和二氧化硅等组成,这些氧化物对工程的安全有着直接且重要的影响。在国家自然科学基金项目的资助下,本文侧重分析和探讨碱侵蚀过程中主要化学成分与红土工程性质的关系,取得了较好的效果。将灰色关联模型分析方法引入本次研究范畴,提出了适合红土中多种氧化物与各工程指标的灰色关联求解权重模型,并利用软件实现了求解模型的改善,从而明显提高了计算效率和准确性。将转化率、流失度和劣化贡献率等相关概念引入研究过程,揭示了碱性物质侵蚀红土的机理,提出了4种主要化学成分与工程性质的量化评价指标,定量确定了红土各成分变化对工程指标的影响,其中二氧化硅和氧化铝的含量变化,对碱蚀红土的工程性质起着关键性作用,但对不同工程指标的劣化贡献率有所不同。通过加速寿命试验、显微观察、滤出离子检测,以及现场钻探试验的结果分析,弄清了红土在碱性环境下的长期劣化机理,且试验结果、原型验证均与化学分析的结论一致。提出了碱侵蚀过程中,红土各主要氧化物含量改变与工程指标变化的趋势预测模型,并验证了预测方法的可行性。所获成果可供类似的研究项目参考,也可广泛用于红土工程的安全评价、寿命预测、以及除险加固之中。采用影响因子来预测各工程指标的变化,不失为一种新思路,并可进一步发展成红土工程质量鉴定的有效方法；依据红土各成分发生变化的量化数据,可具有针对性地拟定工程维修方案,从而避免盲目加固造成的浪费甚至长期损伤。
[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.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.132

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