本文選題：碎屑流 + 沖擊力��； 參考：《西南科技大學》2015年碩士論文

【摘要】：本文利用碎屑流模型實驗和PFC2D顆粒流數(shù)值計算的方法,對碎屑流沖擊擋土墻的動力特征進行了研究。通過研究發(fā)現(xiàn),碎屑流運動時既有摩擦運動機理又有碰撞運動機理,在不同體積、坡度下隨著流體厚度、沖擊角度的改變,兩種機理的相互轉(zhuǎn)化對碎屑流沖擊力有顯著的影響,分析研究了碎屑流沖擊力與影響因素間的關系;碎屑流沖擊擋墻時不同高度上沖擊力呈現(xiàn)非線性變化的特征,通過分析沖擊力的這種變化跟土拱效應有關,因此利用離散元軟件PFC2D進行數(shù)值計算,驗證土拱效應的存在,結果顯示在碎屑流沖擊過程中顆粒間、顆粒與底板間、底板與擋墻間存在沖擊拱,沖擊拱能夠改變沖擊力的跡線影響擋墻上的沖擊力;最后,利用PFC2D數(shù)值計算了不同結構形式、不同顆粒形狀、不同底板系數(shù)等因素對碎屑流沖擊力的變化,對碎屑流沖擊做進一步討論和分析。
[Abstract]:In this paper, the dynamic characteristics of debris flow impingement on retaining wall are studied by using the model experiment of clastic flow and the numerical method of PFC2D particle flow. It is found that there are both frictional and collisional motion mechanisms in the debris flow movement. With the change of fluid thickness and impact angle at different volume and slope, the mutual transformation of the two mechanisms has a significant effect on the impact force of the debris flow. The relationship between the impact force of debris flow and the influencing factors is analyzed, and the nonlinear variation of impact force at different heights is observed when the debris flow impacts on the retaining wall, which is related to the soil arch effect through the analysis of the impact force. Therefore, numerical calculation with discrete element software PFC2D is used to verify the existence of soil arch effect. The results show that there are impact arches between particles, between particles and bottom plates, and between floor plates and retaining walls during the impact of debris flow. The impact arch can change the trace line of impact force to influence the impact force on the retaining wall. Finally, the impact force of debris flow is calculated by using PFC2D numerical calculation, such as different structure form, different particle shape, different floor coefficient and so on. The impact of debris flow is discussed and analyzed further.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.2;TU476

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相關期刊論文 前2條

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本文編號：1845718