合安高速铁路膨胀土工程特性研究

发布时间：2018-08-15 13:50

【摘要】：膨胀土是对工程有极大危害的一种特殊岩土。长久以来都是工程建设中一个不能彻底解决的难题,如果处理不当会带来极大的经济损失。属于国内外工程界的热点问题。本文新建合安高速铁路途经膨胀土分布广泛的江淮地区,在该线路区域各分段中,合肥-肥西分布少量中-强膨胀土,庐江-安庆段分布少量弱膨胀土,其他分段和区域为中膨胀土。除去其他天然材料的一些共性外,由于自身结构和成分的特殊性,膨胀土还具有一些比较重要的工程特性。这些特性中,会严重影响工程设计和建设的有胀缩性、裂隙性、超固结性等,如不加处理直接用以填筑路基或者处理不得当,会对路基稳定性带来相当大的危害,或是带来工程处理方案的错误制定,使工程措施偏于保守而造成浪费。新建合安高速铁路属于高标准建设的客运铁路项目,与普通铁路相比有很大的不同,这类高速铁路最大的特点和要求为：高速度、舒适性、极高安全性和较高的行车密度。而膨胀土独特的工程特性会对高速铁路运营造成极大的潜在隐患。本文介绍了国内外膨胀土研究发展现状,深入研究了合安高速铁路沿线膨胀土的分类和工程特性,并通过数理统计方法对重要的物理力学性质以及矿物成分等进行了归纳统计,直观表现出了该线路各分段膨胀土基本性质方面的差异和趋势,采用了回归分析的方法对所得的实验数据进行了相关性分析,通过实验手段重点对该线路膨胀土三大工程特性进行了研究。结合对既有线路和工程的勘察,分析了合安高速铁路膨胀土对新建铁路路基的影响。并给出了工程建议。
[Abstract]:Expansive soil is a kind of special rock and soil which has great harm to engineering. It has long been a difficult problem in engineering construction that can not be solved completely. If it is not handled properly, it will bring great economic losses. It belongs to the hot issues in the field of engineering at home and abroad. In this paper, a small amount of medium and strong expansive soil is distributed in each segment of this railway area, and a small amount of weak expansive soil is distributed in the section of Lujiang to Anqing. Other subsections and regions are moderately expansive soil. In addition to some commonalities of other natural materials, expansive soil has some important engineering characteristics due to the particularity of its own structure and composition. These characteristics will seriously affect the engineering design and construction, such as dilatancy and shrinkage, fissures, over-consolidation, etc. If not treated directly to fill the roadbed or not properly treated, it will bring considerable harm to the stability of the roadbed. Or lead to the wrong formulation of project treatment plan, so that the project measures are conservative and cause waste. The new He-an high-speed railway is a passenger railway project of high standard construction, which is very different from the ordinary railway. The biggest characteristics and requirements of this kind of high-speed railway are: high speed, comfort, extremely high safety and high driving density. The unique engineering characteristics of expansive soil will cause great potential hidden danger to the operation of high-speed railway. This paper introduces the research and development of expansive soil at home and abroad, studies the classification and engineering characteristics of expansive soil along He-an high-speed railway, and sums up and statistics the important physical and mechanical properties and mineral composition by means of mathematical statistics. The differences and trends of the basic properties of the expansive soils in different sections of the line are shown intuitively, and the correlation analysis of the experimental data is carried out by means of regression analysis. The three engineering characteristics of expansive soil on the line are studied by means of experiment. Combined with the investigation of existing lines and projects, the influence of expansive soil on the newly built railway subgrade is analyzed. Some engineering suggestions are given.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U213.14

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