本文選題：高液限土　切入點：石灰改良　出處：《長沙理工大學》2014年碩士論文

【摘要】：本文針對高液限土液限高、含水量大、變形大的特點,結合廣西灌鳳高速公路工程進行研究。我們發(fā)現(xiàn)公路沿線分布的大量高液限土,若直接用作路基填料不能滿足規(guī)范要求,需對沿線高液限土進行處治以滿足工程要求。本文從微觀的角度,采用分形理論并結合圖像處理技術研究石灰改良高液限土的機理。從而,根據(jù)石灰改良前后土體微觀結構的變化定量分析改良的效果。經(jīng)研究,得到以下成果：(1)在大量的現(xiàn)場和室內試驗基礎上,研究了石灰改良高液限土的物理力學性能的變化,系統(tǒng)分析石灰改良高液限土的路用性能。(2)從微觀角度對土體礦物結構、土體膠結作用方式及土體孔隙變化進行分析。采用分形理論,結合圖像處理技術,對土體孔隙度、孔隙數(shù)量及大小、孔隙邊緣粗糙度進行了研究分析。(3)通過計算不同分形模型的分形維數(shù),建立了分形維數(shù)與土體強度、養(yǎng)護齡期、干密度、滲析率及顆粒咬合力的關系,進而定量分析改良前后土體微觀結構性能的變化。(4)結合非飽和土有效應力原理,對石灰改良高液限土的宏微觀力學性能變化進行研究,使土體微觀結構的變化與宏觀性能相關聯(lián),幫助我們更好地解釋石灰改良高液限土的機理。
[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.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1
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本文編號：1673199