改良高液限粘土在常德市桃花源机场快速路的应用研究

发布时间：2018-06-19 02:01

本文选题：高液限粘土 + 改良　；参考：《长沙理工大学》2015年硕士论文

【摘要】：国内外对于高液限土的研究一般围绕着两个方面进行,一方面是高液限土本身的物理、力学特性和工程性质的认识;另一方面是高液限土的合理处治利用问题。高液限粘土天然含水率大,液限高,塑性指数大,水稳定性差,由于物理性能和工程特性,将其直接用于路基填筑,将产生压实度不足、翻浆、边坡坍塌等一系列病害。因此,系统地开展改良高液限粘土路用性能研究,具有重要的工程实际意义。本文依托常德市桃花源机场快速路建设工程,对高液限粘土的物理、化学性质进行了比较深入的分析,分别进行了基本物理性质试验、物质组成测试、干法、湿法击实试验、CBR试验、室内承载板试验,试验结果表明,机场快速路路基填筑所用的高液限粘土不符合路床填筑要求。针对高液限粘土提出了不同的改良试验方案,分别掺入不同比例的砂砾、水泥和石灰进行改良,经过改良后的高液限粘土在CBR值和回弹模量上均得到了相应提高,改良后高液限粘土的路用性能指标均达到了常德市机场快速路路基填筑的要求。通过试验路的铺筑,进一步验证了室内改良试验的研究成果,同时提出了改良高液限粘土填筑路基的施工工艺和质量控制要求,为同类工程建设提供参考。结合常德市建材价格对不同的高液限粘土改良方案的经济效益进行分析,表明掺20%砂砾的费用低于掺3%水泥或者3%石灰的费用,掺30%砂砾的费用最高。
[Abstract]:The research of high liquid limit soil at home and abroad is generally carried out in two aspects: on the one hand, the understanding of physical, mechanical and engineering properties of high liquid limit soil; on the other hand, the rational treatment and utilization of high liquid limit soil. High liquid limit clay has high natural moisture content, high liquid limit, large plastic index and poor water stability. Due to its physical properties and engineering properties, it is directly used in subgrade filling, which will produce a series of diseases, such as insufficient compaction, overturning, slope collapse and so on. Therefore, it is of great practical significance to systematically study the road performance of improved high liquid limit clay. Based on the construction project of Taohuayuan Airport Expressway in Changde City, the physical and chemical properties of high liquid limit clay are analyzed in depth, and the basic physical property test, material composition test and dry method are carried out respectively. The results show that the high liquid limit clay used in the roadbed filling of the airport expressway does not meet the road bed filling requirements. Different improvement test schemes were put forward for high liquid limit clay, which were modified with different proportion of sand gravel, cement and lime respectively. The CBR value and resilience modulus of the improved high liquid limit clay were improved correspondingly. The road performance indexes of the improved high liquid limit clay meet the requirements of subgrade filling of Changde Airport Expressway. Through the paving of the test road, the research results of the indoor improvement test are further verified, and the construction technology and quality control requirements of the improved high liquid limit clay filling subgrade are put forward, which provides a reference for the similar engineering construction. The economic benefits of different schemes for improving high liquid limit clay are analyzed in combination with the price of building materials in Changde City. The results show that the cost of 20% sand gravel is lower than that of 3% cement or 3% lime, and the cost of 30% sand gravel is the highest.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

【相似文献】