STUDY OF TIME-DEPENDENT LOCAL SCOUR AROUND BRIDGE PIERS
STUDY OF TIME-DEPENDENT LOCAL SCOUR AROUND BRIDGE PIERS
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DOI：
10.1061/(asce)0733-9429(1991)117:10(1247
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发表时间：
1991-10
影响因子：
2.4
通讯作者：
A. Yanmaz;H. Altinbilek
中科院分区：
文献类型：
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作者：
A. Yanmaz;H. Altinbilek
桥墩周围最大可能冲刷深度的估算是桥墩基础设计的重要环节。在已知设计洪水过程线的洪峰流量和达峰时间等水文特性的情况下，与清水条件对应的平衡冲刷深度相比，可以获得较小的冲刷深度。为了研究这种现象，必须确定桥墩周围局部冲刷深度的时间变化。为此，在实验室中，在具有均匀床料的清水条件下，使用单个圆柱形和方形桥墩模型进行了多组实验。采用桥墩冲刷坑泥沙连续性方程，对桥墩局部冲刷深度进行了半经验时变分析。出于设计目的，根据各种泥沙和水流特性编制了无因次冲刷预测曲线。
Estimation of maximum possible scour depth around bridge piers is an important step in the design of bridge pier foundations. Under known hydrological characteristics such as peak discharge and time-to-peak value of design flood hydrograph, smaller scour depths can be obtained compared to the equilibrium scour depths corresponding to clear water conditions. To examine such a phenomenon, time variation of local scour depths around bridge piers has to be determined. To this end, sets of experiments are performed using single cylindrical and square bridge pier models in the laboratory under clear water conditions with uniform bed materials. Semiempirical time-dependent analysis of local scour depths around bridge piers has been conducted using the sediment continuity equation for the scour hole around bridge piers. For design purposes, nondimensional scour prediction curves were prepared in terms of various sediment and flow properties.