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

【摘要】：為研究水流作用下壩垛根石的走失,基于Flow-3D軟件中GMO模型和RNG k-ε紊流模型建立了根石走失特性研究的數(shù)值模型。進(jìn)行了水流作用于立方塊體的數(shù)值水槽試驗(yàn),將水流對(duì)立方塊體作用力的數(shù)值模擬值與公式計(jì)算值進(jìn)行對(duì)比,發(fā)現(xiàn)兩者基本一致,說(shuō)明數(shù)值模型可用。隨后對(duì)某一實(shí)際壩垛工程進(jìn)行了根石走失的數(shù)值模擬計(jì)算,計(jì)算結(jié)果表明:壩垛周圍根石走失最嚴(yán)重的區(qū)域?yàn)閴吻邦^,上跨角次之,壩前頭處根石起動(dòng)的時(shí)間最早,拖曳力上升最快,走失的距離最遠(yuǎn);上跨角靠近壩前頭處的部分根石走失時(shí)間早,程度嚴(yán)重,靠近迎水面處根石走失時(shí)間較晚,在水流流速進(jìn)一步加大時(shí)逐漸走失;迎水面與下跨角處的根石受水流作用力較小,基本無(wú)走失現(xiàn)象。根石走失后并未隨水流持續(xù)運(yùn)動(dòng),大部分根石散落在壩襠間。
[Abstract]:In order to study the loss of rockfill under the action of water flow, a numerical model is established based on GMO model and RNG k- 蔚 turbulence model in Flow-3D software. The numerical flume experiment of water flow acting on cubic block is carried out. By comparing the numerical simulation value with the calculated value of the formula, it is found that the numerical model is in good agreement with the calculated value, which shows that the numerical model can be used. Then the numerical simulation of the root stone loss in a practical dam stacking project is carried out. The results show that the most serious area of the root stone loss around the dam stack is the front of the dam, the upper span angle is the second, and the starting time of the root stone in the front of the dam is the earliest. The drag force rises fastest and the distance of loss is the furthest, the upper span angle is near the front of the dam and some of the root rocks are lost earlier, the degree is serious, and the time of the root stone loss near the water surface is late, and gradually when the flow velocity is further increased, the drag force rises fastest and the distance is the furthest away, and the upper span angle is near the front of the dam. The root stone at the angle between the water and the bottom is less affected by the water flow, and there is basically no phenomenon of loss. The root stone does not move continuously with the water flow, and most of the root stone is scattered in the crotch of the dam.
【作者單位】： 南昌大學(xué)建筑工程學(xué)院;黃河水利科學(xué)研究院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51509104) 江西省自然科學(xué)基金青年項(xiàng)目(20161BAB216116)
【分類號(hào)】：TV85;TV861

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本文編號(hào)：1995682