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。
In order to study the loss of root stones under the action of water flow in dam buttress, based on the Flow-3D software, a mathematical model for studying the loss characteristics of root stones is established by using the GMO model and the RNG k-s model. The numerical flume test of water flow acting on the cubic block is carried out. The water forces acting on cubic block simulated by the numerical model and calculated by the formula are basically the same, which indicates that the numerical model is reasonable. Then this numerical simulation method of root stones lost is appplied to an actual dam buttress project. The result shows that the most serious area of root stones lost around the dam buttress is the front head of the dam, and followed by the upper cross corner area. It can be found that the movement of root stones in the front head of the dam is the earliest, the rising rate of water drag force is the fastest and the distance of movement is the farthest. The movement of root stones in the upper cross corner area near the front head of the dam is early and the loss of root stones is serious, while the movement of root stones in upper cross corner area near the upstream face area is later and these stones move to downstream gradually as the water flow velocity increases. Root stones in the upstream face area and down cross corner area are less affected by water flow, with basically no root stones lost. The root stones lost don’t continue to move with the water flow, and most of them scatter in the dam crotch.
出处
《水利水运工程学报》
CSCD
北大核心
2017年第5期45-50,共6页
Hydro-Science and Engineering
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)
