Study of Flow Characteristics and Anti-Scour Protection Around Tandem Piers Under Ice Cover

被引:0
|
作者
Gao, Pengcheng [1 ]
Chang, Lei [2 ]
Mou, Xianyou [3 ]
Gao, Feng [1 ]
Su, Haitao [1 ]
Zhang, Bo [1 ]
Shang, Zhiqiang [1 ]
Gao, Lina [1 ]
Qin, Haode [1 ]
Ma, Hui [1 ]
机构
[1] Inner Mongolia Inst Water Resources Res, Hohhot 010018, Peoples R China
[2] Inner Mongolia Autonomous Reg Surveying & Mapping, Hohhot 010018, Peoples R China
[3] Inner Mongolia Agr Univ, Coll Water Conservancy & Civil Engn, Hohhot 010018, Peoples R China
基金
中国国家自然科学基金;
关键词
ice cover; tandem bridge pier; anti-scour protection; quadrant analysis; power spectrum; CLEAR-WATER SCOUR; SIDE BRIDGE PIERS; LOCAL SCOUR; SEDIMENT TRANSPORT; VELOCITY PROFILES; INCIPIENT MOTION; TURBULENCE; HOLE; DEPTH; RIVER;
D O I
10.3390/buildings14113478
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The impact of an ice-covered environment on the local flow characteristics of a bridge pier was studied through a series of flume tests, and the dominant factors affecting the scour pattern were found to grasp the change laws of the local hydrodynamic characteristics of the bridge pier under the ice cover. At the same time, because the scour problem of the pier foundation is a technical problem throughout the life-cycle of the bridge, to determine the optimal anti-scour protection effect on the foundation of the bridge pier, active protection scour plate was used to carry out scour protection tests, and its structural shape was optimized to obtain better anti-scour performance. The test results show that the jumping movements of sediment particles in the scour hole around the pier are mainly caused by events Q2 and Q4, which are accompanied by events Q1 and Q3 and cause the particle rolling phenomenon, where Q1 and Q3 events are outward and inward interacting flow regimes, and Q2 and Q4 events are jet and sweeping flow regimes, respectively. The power spectral attenuation rate in front of the upstream pier is high without masking effects, while strong circulation at the remaining locations results in strong vorticity and high spectral density, in particular, when the sampling time series is 60 s (i.e., f = 1/60), the variance loss rates under ice-covered conditions at the front of the upstream pier, between the two piers, and at the tail end of the downstream pier are 0.5%, 4.6%, and 9.8%, respectively, suggesting a smaller contribution of ice cover to the variance loss.
引用
收藏
页数:25
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