石灰改良高液限土机理分析

发布时间：2018-03-27 20:49

  本文选题：高液限土　切入点：石灰改良　出处：《长沙理工大学》2014年硕士论文

【摘要】：本文针对高液限土液限高、含水量大、变形大的特点,结合广西灌凤高速公路工程进行研究。我们发现公路沿线分布的大量高液限土,若直接用作路基填料不能满足规范要求,需对沿线高液限土进行处治以满足工程要求。本文从微观的角度,采用分形理论并结合图像处理技术研究石灰改良高液限土的机理。从而,根据石灰改良前后土体微观结构的变化定量分析改良的效果。经研究,得到以下成果：(1)在大量的现场和室内试验基础上,研究了石灰改良高液限土的物理力学性能的变化,系统分析石灰改良高液限土的路用性能。(2)从微观角度对土体矿物结构、土体胶结作用方式及土体孔隙变化进行分析。采用分形理论,结合图像处理技术,对土体孔隙度、孔隙数量及大小、孔隙边缘粗糙度进行了研究分析。(3)通过计算不同分形模型的分形维数,建立了分形维数与土体强度、养护龄期、干密度、渗析率及颗粒咬合力的关系,进而定量分析改良前后土体微观结构性能的变化。(4)结合非饱和土有效应力原理,对石灰改良高液限土的宏微观力学性能变化进行研究,使土体微观结构的变化与宏观性能相关联,帮助我们更好地解释石灰改良高液限土的机理。
[Abstract]:In view of the characteristics of high liquid limit soil with high liquid limit, large water content and large deformation, this paper studies the characteristics of Guangxi Guanfeng Expressway Project. It is found that a large number of high liquid limit soils distributed along the highway can not meet the requirements of the specifications if they are directly used as subgrade fillers. It is necessary to treat the high liquid limit soil along the line to meet the engineering requirements. In this paper, fractal theory and image processing technology are adopted to study the mechanism of lime improving high liquid limit soil from the microscopic point of view. Based on the quantitative analysis of soil microstructure changes before and after lime improvement, the following results were obtained: 1) on the basis of a large number of field and laboratory tests, the physical and mechanical properties of lime modified high liquid limit soil were studied. This paper systematically analyzes the road performance of lime modified high liquid limit soil.) from the microscopic point of view, the mineral structure of soil, the cementation mode of soil and the change of soil pore are analyzed. The porosity of soil is analyzed by means of fractal theory and image processing technology. By calculating the fractal dimension of different fractal models, the relationship between fractal dimension and soil strength, curing age, dry density, dialysis rate and particle bite force is established. Then quantitative analysis of the changes of microstructure and properties of soil before and after improvement. (4) combined with the principle of effective stress of unsaturated soil, the changes of macro and micro mechanical properties of lime modified high liquid limit soil are studied. The change of soil microstructure is related to macroscopic properties, which helps us to better explain the mechanism of lime improving high liquid limit soil.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1
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本文编号：1673199