本文選題：土體微觀結(jié)構(gòu) + 結(jié)構(gòu)參量�。� 參考：《河北工業(yè)大學(xué)》2014年碩士論文

【摘要】：對于穿越古湖泊濕地地區(qū)的邢衡高速公路，沿線廠泛分布著軟弱土，該地區(qū)受地形地勢和氣候降水等自然因素的影響，具有區(qū)別于東部沿海平原地區(qū)軟土的特盧。大量的研究和實踐證明，，土體的工程性質(zhì)除了與其物質(zhì)成分、顆粒分布等密切相關(guān)外，其微觀結(jié)構(gòu)因素如顆粒形狀、分布、排列和連結(jié)方式、孔隙尺度及孔隙本等也起到支配和控制作用，軟土微結(jié)構(gòu)的復(fù)雜性和隨機(jī)性導(dǎo)致其宏觀上力學(xué)性質(zhì)的復(fù)雜性和隨機(jī)性。本文通過試驗，利用掃描電子顯微鏡和分形理論研究了土體不同應(yīng)力狀態(tài)下的微觀結(jié)構(gòu)。主要研究內(nèi)容和成果如下： (1)通過對邢衡高速沿線軟弱土原狀土進(jìn)行室內(nèi)土工試驗以及X射線衍射試驗,得出邢衡高速軟弱土的基本物理力學(xué)性質(zhì)、礦物成分組成以及顆粒組成。采用電鏡掃描(SEM)測試技術(shù)，對邢衡高速沿線內(nèi)在不同應(yīng)力路徑下的軟弱土原狀土樣的水平截面和垂直截面微觀結(jié)構(gòu)特征進(jìn)行了觀測，分析不同應(yīng)力下土樣的微觀結(jié)構(gòu)特征。 (2) 土體微觀結(jié)構(gòu)的參量提取與定量分析。利用土體微觀結(jié)構(gòu)圖像數(shù)據(jù)提取出表達(dá)土體微觀結(jié)構(gòu)特征的參數(shù)，如顆粒等效粒徑、數(shù)量、圓度等，分析了不同應(yīng)力狀態(tài)下土樣水平截面與垂直截面的微觀結(jié)構(gòu)參數(shù)，揭示了不同應(yīng)力狀態(tài)下的軟弱土各自微結(jié)構(gòu)參數(shù)隨壓力的變化規(guī)律，從而闡述土體發(fā)生宏觀變形的微觀機(jī)制。 (3)基于分形理論適合于研究復(fù)雜不規(guī)則圖形的特盧，本文運(yùn)用分形理論對土體的微觀結(jié)構(gòu)進(jìn)行了深入分析。同時，針對本次研究內(nèi)容的特盧，定義了研究土體中孔隙和顆粒分布狀況的平面分形維數(shù)。利用MATLAB語言編寫程序，對土體微觀結(jié)構(gòu)圖片進(jìn)行了平面分維計算，分析不同應(yīng)力狀態(tài)下試驗后土體微觀結(jié)構(gòu)的分形特征。
[Abstract]:For Xingheng Expressway crossing ancient lake wetland area, soft soil is widely distributed along the highway, which is different from the soft soil in the eastern coastal plain by natural factors such as topography and precipitation. A large number of researches and practices have proved that the engineering properties of soil are closely related to its material composition and particle distribution, and its microstructural factors such as the shape, distribution, arrangement and connecting mode of particles. Pore size and pore size also play a dominating and controlling role. The complexity and randomness of the microstructure of soft soil lead to the complexity and randomness of its macroscopic mechanical properties. In this paper, the microstructure of soil under different stress states is studied by means of scanning electron microscope and fractal theory. The main research contents and results are as follows: 1) the basic physical and mechanical properties of Xingheng high speed soft soil are obtained by indoor geotechnical test and X-ray diffraction test. Mineral composition and particle composition. By means of scanning electron microscopy (SEM) technique, the microstructural characteristics of horizontal and vertical sections of undisturbed soft soil samples along Xingheng high speed line under different stress paths were observed. The microstructural characteristics of soil samples under different stresses are analyzed. The parameters of soil microstructure such as equivalent particle size, quantity and roundness are extracted from the image data of soil microstructure. The microstructure parameters of horizontal and vertical sections of soil samples under different stress states are analyzed. In this paper, the variation law of microstructural parameters with pressure of soft soil under different stress states is revealed, and the microscopic mechanism of macroscopic deformation of soil is expounded. Based on fractal theory, it is suitable for studying complex irregular patterns. In this paper, fractal theory is used to analyze the microstructure of soil. At the same time, the plane fractal dimension of pore and particle distribution in soil is defined in this paper. In this paper, the fractal dimension of soil microstructure is calculated by MATLAB language, and the fractal characteristics of soil microstructure under different stress states are analyzed.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U412.22

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