本文選題：滑體顆粒　切入點：運動特性　出處：《蘭州大學》2015年碩士論文

【摘要】：滑體運動包含滑體崩落、滑動、滾動、坡面撞擊回彈以及滑體顆粒之間相互碰撞等多種作用形式,運動過程與滑體顆粒的力學特性、物理參數(shù)以及邊坡特性等多種因素有關。目前,相關研究大多是基于滑體的形成機理,而對其滑后運動特性的研究相對較少。因此,本論文基于離散單元法對滑體下滑的運動進行仿真,著重對滑體在流向內物體前的堆積特性及其對擋墻所造成的沖擊作用等進行分析。主要研究工作如下：首先,建立了滑體運動及其對流向內受災體沖擊的二維離散單元模型�；诨w下滑過程中不同時刻的空間形態(tài),分析了其下滑過程中的基本運動特性。同時,通過統(tǒng)計滑體滑動過程中對流向內物體不同高度處的沖擊作用,分析了滑體沖擊結束后的靜態(tài)堆積特性；最后分析了滑體顆粒間的摩擦系數(shù)、堆積區(qū)域長度以及邊坡坡角對滑體下滑后的最大堆積力的影響規(guī)律,并進一步討論了這些參數(shù)對滑體靜態(tài)堆積形態(tài)的影響。其次,基于顆粒流理論,建立了一個簡單的斜面滑體顆粒對擋墻的動態(tài)沖擊模型。通過分析滑體在斜面滑動過程中的動力學行為及其能量耗散特征,給出滑體在整個沖擊過程中對擋墻沖擊作用的時空演化規(guī)律,得到的動態(tài)沖擊力與已有實驗結果定性一致。針對不同滑體顆粒的初始構型,討論了最大動態(tài)沖擊力的分布特征。在此基礎上,分析了滑體顆粒摩擦系數(shù)、滑體的斜面滑動距離以及邊坡坡面粗糙度等參數(shù)對擋墻所受最大沖擊力的影響�？傊�,通過對滑體運動過程中的動力學特性及其對受災體及擋墻的沖擊作用研究,一方面可以為工程建設中邊坡防護結構的設計建造提供相關理論支持。另一方面可以探究顆粒群體與連續(xù)結構之間的復雜作用過程,這對從微觀層面研究滑體運動的動力學特性是一個有益的嘗試。
[Abstract]:The motion of sliding body includes many kinds of action forms, such as caving, sliding, rolling, bumping and springback of slope, and collision between particles of sliding body, and so on, and the movement process and the mechanical properties of the particles of sliding body. Physical parameters and slope characteristics are related to many other factors. At present, most of the related studies are based on the formation mechanism of sliding body, but there are few researches on its motion after sliding. Based on the discrete element method, this paper simulates the sliding motion of sliding body, focusing on the analysis of the stacking characteristics of the sliding body before the flow direction of the body and its impact on the retaining wall. The main research work is as follows: first of all, A two-dimensional discrete element model of sliding body motion and its impact on the body affected by the flow direction is established. Based on the spatial morphology of the sliding body at different times, the basic motion characteristics of the sliding body are analyzed. The static stacking characteristics of the sliding body after the end of the impact are analyzed by statistics of the impact action of the sliding body on different heights of the body in the flow direction. Finally, the friction coefficient between the particles of the sliding body is analyzed. The influence of the length of the stacking region and the slope angle on the maximum stacking force of the sliding body is discussed, and the influence of these parameters on the static stacking shape of the sliding body is discussed. Secondly, based on the particle flow theory, In this paper, a simple dynamic impact model of inclined sliding body particles on retaining wall is established. The dynamic behavior and energy dissipation characteristics of sliding body during slope sliding are analyzed. The temporal and spatial evolution of the effect of sliding body on the impact of retaining wall during the whole impact process is given. The obtained dynamic impact force is qualitatively consistent with the existing experimental results. The distribution characteristics of maximum dynamic impact force are discussed. On the basis of this, the influence of parameters such as the friction coefficient of sliding particles, slope slip distance and slope roughness on the maximum impact force on the retaining wall is analyzed. The dynamic characteristics of the sliding body and its impact on the affected body and retaining wall are studied. On the one hand, it can provide theoretical support for the design and construction of slope protection structure in engineering construction, on the other hand, it can explore the complex process between particle group and continuous structure. This is a useful attempt to study the dynamic characteristics of sliding body motion from the micro level.
【學位授予單位】：蘭州大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.2

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本文編號：1669042