【摘要】：本文基于分形理論、植物生態(tài)學(xué)理論和邊坡工程力學(xué)理論等多種護坡理論,通過數(shù)值模擬和室內(nèi)試驗對香根草生態(tài)護坡性能的機理進行研究。基于分形理論和植物生態(tài)學(xué)理論建立香根草根系的形態(tài)模型,結(jié)合香根草根系的形態(tài)模型分析香根草根系的分形維數(shù)與其形態(tài)參數(shù)的相關(guān)關(guān)系�；谶吰鹿こ痰乃男�(yīng)理論和力學(xué)效應(yīng)理論,通過室內(nèi)模擬試驗對香根草生態(tài)護坡性能的水文效應(yīng)和力學(xué)效應(yīng)進行試驗研究,建立香根草根系的分形維數(shù)與香根草生態(tài)護坡性能的水文效應(yīng)參數(shù)和力學(xué)效應(yīng)參數(shù)的相關(guān)關(guān)系�；谟邢拊治隼碚摵湍枴獛靷惼茐臏�(zhǔn)則建立香根草根系與邊坡土體相互作用的模型,通過對模型的數(shù)值模擬計算探究邊坡表層穩(wěn)定性與香根草根系分形維數(shù)的相關(guān)關(guān)系。(1)香根草根系的分形維數(shù)隨著其生長期的延長而逐漸增大,兩者呈現(xiàn)顯著的對數(shù)相關(guān)關(guān)系。(2)最大降雨截留率和單位面積最大降雨截留量隨著香根草根系分形維數(shù)的增加而增加,且呈現(xiàn)顯著的線性正相關(guān)。(3)香根草根系的抗拉力隨著根系直徑的增大而逐漸增大,隨著根系長度的增加基本保持不變;香根草根系的抗拉強度與抗拉力均隨著根系直徑的增大而減小,隨著根系的長度增大而減小,且呈現(xiàn)多元指數(shù)的相關(guān)關(guān)系。(4)根土復(fù)合體的粘聚力和內(nèi)摩擦角隨著含根量的增加呈現(xiàn)線性增加的趨勢,隨著根系分形維數(shù)的增加也呈現(xiàn)線性增加的趨勢。在圍壓一定的條件下,不同根系分布方式的根土復(fù)合體的破壞荷載存在差異,具體表現(xiàn)為混合型相交型豎向型傾斜型;邊坡穩(wěn)定系數(shù)隨著含根量的增加呈現(xiàn)線性增加趨勢,隨著分形維數(shù)的增加也呈現(xiàn)線性增加趨勢。(5)在分支角度一定時,隨著分形維數(shù)的增加,邊坡表層的水平位移、豎向位移和總位移均有不同程度地降低,邊坡表層的水平位移減小量、豎向位移減小量和總位移減小量與分形維數(shù)呈現(xiàn)顯著性的線性相關(guān)關(guān)系。
[Abstract]:Based on fractal theory, plant ecology theory and slope engineering mechanics theory, the mechanism of Vetiver ecological slope protection was studied by numerical simulation and laboratory test. Based on fractal theory and plant ecology theory, the morphological model of Vetiver root system was established, and the correlation between the fractal dimension of Vetiver root system and its morphological parameters was analyzed. Based on the hydrological effect theory and mechanical effect theory of slope engineering, the hydrological and mechanical effects of Vetiver ecological slope protection were studied through indoor simulation tests. The correlation between the fractal dimension of Vetiver root system and the hydrological and mechanical effect parameters of the ecological slope protection performance of Vetiver was established. Based on the theory of finite element analysis and the Moorn-Coulomb failure criterion, a model of the interaction between root system and slope soil was established. The correlation between the surface stability of slope and the fractal dimension of Vetiver root system was studied by numerical simulation. (1) the fractal dimension of Vetiver root increased with the extension of the growth period. There was a significant logarithmic correlation between them. (2) the maximum rainfall interception rate and the maximum rainfall interception per unit area increased with the increase of fractal dimension of Vetiver root system. And there was significant linear positive correlation. (3) the tensile strength of Vetiver root increased gradually with the increase of root diameter, and remained unchanged with the increase of root length. The tensile strength and tensile strength of Vetiver root decreased with the increase of root diameter, and decreased with the increase of root length. (4) the cohesive force and the angle of internal friction of the root soil complex increase linearly with the increase of root content, and the fractal dimension of root increases linearly with the increase of root fractal dimension. Under certain confining pressure, the failure load of root soil complex with different root distribution modes is different, which is shown as mixed intersecting vertical inclined type, and slope stability coefficient increases linearly with the increase of root content. (5) with the increase of fractal dimension, the horizontal displacement, vertical displacement and total displacement of slope surface layer are decreased to some extent with the increase of fractal dimension. (5) with the increase of fractal dimension, the horizontal displacement, vertical displacement and total displacement of slope are decreased to some extent. The horizontal displacement, vertical displacement and total displacement decrease of the surface layer of the slope show a significant linear correlation with the fractal dimension.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：Q948;U416.14

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