本文選題：黏性土壩 + 漫頂��； 參考：《水利水運(yùn)工程學(xué)報(bào)》2017年05期

【摘要】：黏性土壩漫頂潰決涉及多學(xué)科交叉,過程極其復(fù)雜,盡管國(guó)內(nèi)外大量物理模型試驗(yàn)成果表明其潰決多以"跌坎式"溯源沖蝕為主要特征,然而對(duì)該沖蝕發(fā)展形式下的水流-壩體微觀作用機(jī)制尚不清晰。水流作為漫頂潰決的沖刷主動(dòng)力,對(duì)壩體潰決發(fā)展起著主導(dǎo)性作用,采用RNG k-ε紊流模型和VOF自由液面捕捉技術(shù)針對(duì)黏性土壩漫頂潰決代表性水流結(jié)構(gòu)——潰決跌坎水流開展了三維數(shù)值模擬研究,對(duì)跌坎水流的水流結(jié)構(gòu)、流態(tài)、水力特性指標(biāo)等進(jìn)行了細(xì)致分析,揭示了不同工況下壩體跌坎上的剪切應(yīng)力、流速分布規(guī)律,進(jìn)而從水動(dòng)力學(xué)的角度對(duì)壩面進(jìn)行受力分析,初步推斷了黏性土壩漫頂潰決過程中各級(jí)跌坎的主要合并方式為"臺(tái)階水平面刷深下切"。研究成果為進(jìn)一步掌握黏性土壩漫頂潰決發(fā)展演變機(jī)理提供了理論基礎(chǔ)。
[Abstract]:The overtopping failure of viscous earth dam involves multi-disciplinary crossing and the process is extremely complicated, although a large number of physical model test results at home and abroad show that the main characteristics of the collapse are the traceability erosion. However, the microscopic mechanism of the flow-dam under the erosion development is not clear. As the main power of overtopping collapse, water flow plays a leading role in the development of dam collapse. Using RNG k- 蔚 turbulence model and VOF free surface capture technique, a three-dimensional numerical simulation study was carried out on the representative structure of overtopping and collapsing of viscous earth dam, and the flow structure and flow pattern of the topping flow were studied. The hydraulic characteristic indexes are analyzed in detail to reveal the shear stress and velocity distribution law of the dam body under different working conditions, and then the stress on the dam surface is analyzed from the point of view of hydrodynamics. It is preliminarily inferred that the main combination mode of all levels of falling ridges in the process of overtopping and collapsing of viscous earth dams is "step horizontal brushing deep cutting". The research results provide a theoretical basis for further understanding the evolution mechanism of overtopping of viscous earth dams.
【作者單位】： 南京水利科學(xué)研究院水文水資源與水利工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金委青年科學(xué)基金項(xiàng)目(51409173) 中央級(jí)公益性科研院所基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金(Y116009,Y114004)
【分類號(hào)】：TV135.2

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