高速公路粉煤灰路基填筑关键技术研究

发布时间：2018-06-10 05:43

本文选题：粉煤灰 + 强度性能　；参考：《重庆交通大学》2014年硕士论文

【摘要】：我国的煤炭资源无论是开发还是消耗均居世界之首。全世界每年有四分之一的原煤来自中国,其中有76%是作为能源消耗的。而对我国来讲,电力生产大约34%是来自燃煤发电,这种发电模式虽然为我国提供了大量的能源,但它同时也产生了大量的粉煤灰等工业废弃物。据统计,近年来我国发电厂每年需排放高达3亿吨的粉煤灰,如处理不当,这些工业废弃物将对我国的环境造成严重的污染及危害。贵州省作为西电东送战略部署中重要的电力输出地,其火力发电产业近年来迅猛发展,但由此而产生的大量粉煤灰却没有得到有效的利用,这在一定程度上制约了贵州经济的发展,对建设可持续发展社会、实现节能减排目标造成较大的阻力。本文依托贵州省科委攻关项目“贵州高速公路粉煤灰筑路综合利用技术研究”,对具有丰富煤炭储藏资源的遵毕高速公路沿线的火力发电厂产生的粉煤灰的材料特性、在路堤填筑中的适用性以及粉煤灰路堤施工工艺等进行研究。首先,对目前国内外粉煤灰用于道路工程路基填筑的研究成果及应用情况进行综合概述,并对贵州省遵毕高速公路沿线的火力发电厂生产的粉煤灰的应用情况进行阐述,从而进一步探究本文研究的意义。其次,对粉煤灰的理化学特性以及矿物组成进行研究,并分析粉煤灰的工程特性特别是最大干密度、最佳含水量、抗剪强度、CBR值、回弹模量以及压缩特性等指标,初步得出以下结论：遵毕高速公路沿线火力发电厂生产的粉煤灰能够满足我国路用规范中的相关规定,具有较高的利用价值。再者,以选定的贵州遵毕高速公路沿线五座具有代表性的电厂生产的粉煤灰作为研究对象,通过PLAXIS有限元分析软件进行粉煤灰路堤的稳定性、应力和变形的数值模拟分析,并以此研究结果,对遵毕高速公路沿线粉煤灰在路堤填筑中的适用性进行研究,可得出以下结论：采用粉煤灰填筑的路堤表现出良好的力学性能,在满足路基的强度和稳定性要求的同时,可以有效降低路基的沉降和变形,这对贵州省的高速公路建设具有重要的意义。最后,通过对粉煤灰路堤施工过程进行研究,从施工准备、路堤基底处理、粉煤灰储运、摊铺及碾压以及环境污染控制等几方面进行分析,在现场试验的基础上,进一步总结粉煤灰路堤填筑的施工方法及重点,为今后的道路工程施工提供参考。
[Abstract]:The coal resources of our country are the first in the world whether they are developed or consumed. 1/4 of the world's raw coal comes from China every year, 76 percent of which is consumed as energy. For our country, about 34% of electricity production comes from coal-fired power generation. Although this mode of power generation provides a lot of energy for our country, it also produces a large number of industrial wastes such as fly ash. According to statistics, in recent years, power plants in China need to discharge up to 300 million tons of fly ash every year, such as improper treatment. These industrial wastes will cause serious pollution and harm to the environment of our country. Guizhou Province, as an important power export place in the strategic deployment of power transmission from the west to the east, has witnessed the rapid development of its thermal power generation industry in recent years. However, a large amount of fly ash has not been used effectively, which restricts the economic development of Guizhou to a certain extent, and causes great resistance to the construction of sustainable development society and the realization of energy saving and emission reduction goals. In this paper, based on Guizhou Provincial Science and Technology Commission's key project, "study on Comprehensive Utilization Technology of fly Ash Construction Road in Guizhou Expressway", the material characteristics of coal ash produced by coal-fired power plant along Zunbi Expressway, which has abundant coal storage resources, are studied. The applicability and construction technology of flyash embankment in embankment construction are studied. Firstly, the research results and application of fly ash in roadbed filling of road engineering at home and abroad are summarized. The application of fly ash produced by the thermal power plant along the Zunbi Expressway in Guizhou Province is expounded, so as to further explore the significance of this study. Secondly, the study on the chemical properties and mineral composition of fly ash is carried out. The engineering characteristics of fly ash, especially the maximum dry density, the optimum moisture content, the shear strength and CBR value, the modulus of resilience and the compression characteristics of fly ash are analyzed. The preliminary conclusions are as follows: the fly ash produced by the thermal power plant along the Bi Expressway can meet the relevant regulations in the road use code of our country, and has higher utilization value. The stability, stress and deformation of flyash embankment are simulated by means of PLAXIS finite element analysis software, taking the fly ash produced by five representative power plants along the route of Zhunbi Expressway in Guizhou Province as the research object. Based on the research results, the applicability of fly ash in embankment filling along Zhunbi Expressway is studied. The following conclusions can be drawn: the embankment filled with fly ash shows good mechanical properties. At the same time, it can effectively reduce the settlement and deformation of the roadbed, which is of great significance to the expressway construction in Guizhou Province. Finally, through the study of the construction process of the flyash embankment, Based on the analysis of construction preparation, treatment of embankment base, storage and transportation of fly ash, spreading and rolling, and environmental pollution control, the construction method and key points of flyash embankment filling are summarized on the basis of field test. It provides reference for road engineering construction in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

【参考文献】