甘肃河西地区盐渍土路基处治技术研究

发布时间：2018-05-21 15:14

本文选题：河西盐渍土 + 4%水泥+6%石灰加固土　；参考：《长安大学》2015年硕士论文

【摘要】：甘肃河西地区盐渍土是一种本身的性质会随温度、水的变化而变化、对环境特别敏感并且含有较多的盐的非常特殊的土质。由于这些特有的性质,很多的工程建设会在甘肃河西盐渍土地区产生许多不同形态的病害,如盐胀、溶陷、翻浆、腐蚀、盐渍化等病害。所以为了更好地控制、改善河西地区土壤盐渍化,解决工程建设中各种病害问题,在公路工程建设中应加强对盐渍土路基的处治对策研究。如果不采取治理措施,将对道路路基的正常使用产生很大影响。因此,拟对甘肃河西地区盐渍土路基进行处治方法和技术研究。本文提出采用水泥石灰来加固河西盐渍土,并综合考虑水分、盐分和温度等对固化盐渍土的影响,对盐渍土进行试验研究。文章中采用击实试验、CBR、无侧限饱水抗压强度、水稳定性、冻融循环、温缩性等试验对加固河西地区盐渍土的物理性能、现场路用性能和处治技术等内容进行分析。最后,结合上面各种试验给出了冻融稳定次数、抗稳定系数来评价加固河西地区盐渍土的抗冻性能,提出水稳系数作为水稳定性评价指标等。根据以上试验内容及综合路面需要满足基本技术指标和经济费用等因素:采用4%水泥+6%石灰无机结合料来加固河西盐渍土,以此作为路基填料能够取得很好的性能。另外,根据河西地区盐渍土对公路路基所产生的破坏形式进行分析以及无机结合料加固河西地区盐渍土机理的研究,总结处治盐渍土加固的方法,为以后的工程建设提供参考依据。
[Abstract]:The salinized soil in Hexi area of Gansu Province is a very special soil which is very sensitive to the environment and contains more salt because its properties change with the change of temperature and water. As a result of these special properties, many engineering projects will produce many kinds of diseases in the saline soil area of Hexi, Gansu Province, such as salt expansion, dissolution, slurry, corrosion, salinization and so on. Therefore, in order to better control, improve soil salinization in Hexi area, and solve various disease problems in engineering construction, we should strengthen the study on treatment countermeasures of saline soil subgrade in highway engineering construction. If do not take the treatment measure, will have the very big influence to the road subgrade normal use. Therefore, the treatment method and technology of saline soil subgrade in Hexi area of Gansu Province are studied. In this paper, cement lime is used to reinforce the saline soil in Hexi, and the effect of moisture, salt and temperature on the solidified saline soil is considered synthetically, and the experimental study on the salinized soil is carried out. In this paper, compaction test (CBR), unconfined saturated water compressive strength, water stability, freeze-thaw cycle, temperature shrinkage and so on are used to analyze the physical performance, field road performance and treatment technology of the saline soil in Hexi area. Finally, the freezing and thawing stability times and the stability coefficient are given to evaluate the frost resistance of the saline soil strengthened in Hexi area, and the water stability coefficient is put forward as the evaluation index of water stability. According to the above test content and the need to satisfy the basic technical index and economic cost of the comprehensive road surface, 4% cement 6% lime inorganic binder is used to strengthen the saline soil in Hexi, which can obtain very good performance as the subgrade filler. In addition, according to the analysis of the damage form of the saline soil to the highway roadbed in Hexi area and the study of the mechanism of the inorganic binder in strengthening the saline soil in the Hexi area, the methods of strengthening the saline soil are summarized. To provide reference for the future construction of the project.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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