【摘要】：泥石流是山區(qū)常見的自然災(zāi)害,特別是在我國(guó)西南地區(qū)分布相當(dāng)廣泛。泥石流具有爆發(fā)突然、強(qiáng)度大、破壞力強(qiáng)、范圍廣的特點(diǎn)導(dǎo)致泥石流災(zāi)害一旦發(fā)生后果極為嚴(yán)重。隨著我國(guó)山區(qū)經(jīng)濟(jì)的發(fā)展和環(huán)境污染的加劇,公路、鐵路中的橋涵等工程設(shè)施遭受泥石流災(zāi)害的概率亦隨之增加。由于山區(qū)地形、地質(zhì)、水文、環(huán)境等特點(diǎn),對(duì)連續(xù)剛構(gòu)橋型的選用也日益增多,尤其是深基、高墩、大跨度橋的橋梁,連續(xù)剛構(gòu)橋型是最佳方案之一。故本文開展了泥石流沖擊連續(xù)剛構(gòu)橋的動(dòng)力響應(yīng)研究。本文首先簡(jiǎn)要介紹了泥石流的基本特性,研究了影響泥石流沖擊作用的重要參數(shù),詳細(xì)分析了泥石流控制方程、流變力學(xué)模型、數(shù)值分析方法,確定了本次模擬選擇的泥石流力學(xué)模型及數(shù)值分析方法。通過(guò)Ansys Workbench中計(jì)算流體動(dòng)力學(xué)的CFX模塊模擬了泥石流對(duì)連續(xù)剛構(gòu)橋常見三種不同形式橋墩的沖擊作用,得到了泥石流的體積分布情況、速度流線圖和橋墩所受壓力圖,對(duì)泥石流沖擊作用下橋墩的防護(hù)、連續(xù)剛構(gòu)橋橋墩設(shè)計(jì)有著理論意義和工程參考價(jià)值。通過(guò)Ansys Workbench仿真模擬泥石流對(duì)某客運(yùn)專線連續(xù)剛構(gòu)橋的雙向流固耦合作用,得到其變形分析、應(yīng)力分析。并以泥石流沖擊橋墩得到的壓強(qiáng)作為結(jié)構(gòu)的邊界條件導(dǎo)入,再次進(jìn)行模擬。對(duì)雙向流固耦合和單向流固耦合的結(jié)果進(jìn)行對(duì)比分析。
[Abstract]:Debris flow is a common natural disaster in mountainous areas, especially in southwest China. Debris flow has the characteristics of sudden eruption, high intensity, strong destructive power and wide range, which results in very serious consequences once debris flow disaster occurs. With the development of mountain economy and the aggravation of environmental pollution, the probability of debris flow disaster in highway, railway bridge and culvert is increasing. Due to the characteristics of terrain, geology, hydrology and environment in mountainous areas, the selection of continuous rigid frame bridges is increasing day by day, especially for bridges with deep foundation, high piers, long span bridges and continuous rigid frame bridges. Therefore, the dynamic response of debris flow impact continuous rigid frame bridge is studied in this paper. In this paper, the basic characteristics of debris flow are briefly introduced, the important parameters that affect the impact of debris flow are studied, and the control equation, rheological mechanics model and numerical analysis method of debris flow are analyzed in detail. The mechanical model and numerical analysis method of debris flow are determined. The impact of debris flow on three different types of piers of continuous rigid frame bridge is simulated by CFX module in Ansys Workbench. The volume distribution of debris flow, the velocity streamline diagram and the pressure map of bridge pier are obtained. The design of continuous rigid frame bridge pier under debris flow impact has theoretical significance and engineering reference value. The two-way fluid-structure coupling effect of debris flow on a continuous rigid frame bridge of a passenger dedicated line is simulated by Ansys Workbench, and the deformation analysis and stress analysis are obtained. The pressure obtained by debris flow impingement on the bridge pier is used as the boundary condition of the structure, and the simulation is carried out again. The results of bidirectional fluid-solid coupling and unidirectional fluid-solid coupling are compared and analyzed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441.3;U448.23

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