本文選題：滲透系數 + 孔隙比　； 參考：《湖北工業(yè)大學》2015年碩士論文

【摘要】：土是一種具有復雜物理性能的材料,所以人們對其物理性能的研究很多,土體的宏觀特性決定了土體物理性質,而對于它的宏觀特性又是由其微觀結構所決定的。所以關于土體微觀結構方面的研究意義非凡。滲透系數是土體宏觀性能的參數之一,而土體的微觀孔隙特性對土體的滲透性有顯著的影響。于是在本文中,便探尋了土體的微觀孔隙結構與其宏觀的滲透性能之間的相關性,并通過試驗以及結果分析,研究探索了宏觀的土體滲透性與微觀的孔隙特性之間的關系。而在研究土體微觀孔隙特性與土體滲透性之間的關系時,采用變水頭滲透試驗與壓汞試驗,得到滲透系數,對土體微觀孔隙特性進行分析,輔以分形理論,得到了土體孔隙的分維數,建立了滲透系數與其孔隙分維數之間的關系式。后又對試樣孔隙孔徑與滲透系數間的冪級數關系進行了研究,最后得到了關系式。本文所做的主要研究工作和最后的結論如下:(1)本文制備的土體試樣,為取自武漢某工地的黏土,先測量其物理指標,然后風干過篩,采用靜壓試驗的方法制備2組平行重塑試樣,分別用于壓汞實驗與滲透試驗。(2)在變水頭滲透試驗中,由測量數據及達西公式測得了試樣的滲透系數,得到了滲透系數與孔隙比的關系曲線,可知滲透系數是隨著孔隙比的增加而增大的,但其并無線性相關性。(3)再由壓汞試驗,測得了試樣土體孔隙孔徑累計進汞體積以及孔隙的分布變化規(guī)律,再結合分形理論,可知試樣土體孔隙孔徑具有很好的的分形特征,擬合曲線的線性相關性很好,并且孔隙體積分布分維數,是隨著試樣孔隙率的增大而較小,隨著試樣干密度的增大而增大。(4)在變水頭滲透試驗中,對滲透系數與孔隙率的關系研究時,可知對滲透系數k取對數之后,再與孔隙率n關系研究,得到了它們之間的關系。(5)將試樣孔隙比與分維數的關系式和試樣滲透系數與其孔隙率的關系式聯立起來,經過轉換,最后得到了試樣的滲透系數與孔隙體積分維數的關系式。
[Abstract]:Soil is a kind of material with complex physical properties, so people have studied its physical properties a lot. The macroscopic properties of soil determine the physical properties of soil, and the macroscopic properties of soil are determined by its microstructure. Therefore, the study on the microstructure of soil is of great significance. Permeability coefficient is one of the parameters of macroscopical properties of soil, and the microscopic pore characteristics of soil have significant influence on soil permeability. In this paper, the correlation between the micro-pore structure of soil and its macroscopic permeability is explored, and the relationship between the macroscopic soil permeability and the micro-pore characteristics is studied through the experiments and the analysis of the results. In the study of the relationship between soil micro-pore characteristics and soil permeability, the permeability coefficient is obtained by using water head permeability test and mercury injection test, and the micro-pore characteristics of soil are analyzed with fractal theory. The fractal dimension of soil pore is obtained, and the relationship between permeability coefficient and pore fractal dimension is established. The power series relationship between pore size and permeability coefficient of the sample was studied, and the relationship between pore diameter and permeability coefficient was obtained. The main research work and the final conclusions are as follows: (1) the soil samples prepared in this paper are clay from a construction site in Wuhan. Two groups of parallel remolded samples were prepared by static pressure test for mercury injection test and permeation test respectively. (2) the permeability coefficient of the sample was measured by measuring data and Darcy formula in the permeation test of water head. The relationship curve between permeability coefficient and porosity ratio is obtained. The permeability coefficient increases with the increase of porosity ratio, but there is no linear correlation between permeability coefficient and porosity ratio. (3) by mercury injection test, The pore size accumulative mercury inflow volume and pore distribution of sample soil were measured. Combined with fractal theory, the pore size of sample soil had good fractal characteristics, and the linear correlation of fitting curve was very good. The fractal dimension of pore volume distribution decreases with the increase of porosity and increases with the increase of dry density of sample. (4) the relationship between permeability coefficient and porosity is studied in the permeability test of water head. It is known that the relationship between permeability coefficient k and porosity n is studied, and the relationship between them is obtained. (5) the relationship between sample porosity ratio and fractal dimension and the relationship between sample permeability coefficient and porosity are combined and transformed. Finally, the relationship between the permeability coefficient and the fractal dimension of pore volume is obtained.
【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU442

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