坝垛工程根石走失数值模拟

发布时间：2018-06-08 11:47

本文选题：坝垛 + 根石　；参考：《水利水运工程学报》2017年05期

【摘要】：为研究水流作用下坝垛根石的走失,基于Flow-3D软件中GMO模型和RNG k-ε紊流模型建立了根石走失特性研究的数值模型。进行了水流作用于立方块体的数值水槽试验,将水流对立方块体作用力的数值模拟值与公式计算值进行对比,发现两者基本一致,说明数值模型可用。随后对某一实际坝垛工程进行了根石走失的数值模拟计算,计算结果表明:坝垛周围根石走失最严重的区域为坝前头,上跨角次之,坝前头处根石起动的时间最早,拖曳力上升最快,走失的距离最远;上跨角靠近坝前头处的部分根石走失时间早,程度严重,靠近迎水面处根石走失时间较晚,在水流流速进一步加大时逐渐走失;迎水面与下跨角处的根石受水流作用力较小,基本无走失现象。根石走失后并未随水流持续运动,大部分根石散落在坝裆间。
[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.
【作者单位】：南昌大学建筑工程学院;黄河水利科学研究院;
【基金】：国家自然科学基金资助项目(51509104) 江西省自然科学基金青年项目(20161BAB216116)
【分类号】：TV85;TV861

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