Experimental Investigation of Local Scour Around Inclined Bridge Piers on Clay-Sand Mixed Cohesive Sediment Bed in Clear-Water Conditions

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
Qadeer Ahmad, Usman Ghani
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Abstract

A few investigations on clear water local scour around vertical bridge piers on clay-sand mixed (cohesive sediment) beds are found in the literature. However, no research has been reported on local scour around inclined bridge piers for clay-sand mixed cohesive beds. This research work was carried out to investigate the impact of dual inclined bridge piers (convergent-vertical piers) on maximum scour depth installed in flow direction on four beds containing different clay contents from 20–80% with sand. Three different pier shapes of different cross sections were tested (circular, rectangular & diamond) in each case. The effect of inclination (0°, 5°, 10°, 15°, 20°) with the vertical on the same beds was analyzed and discussed. The results revealed a considerable reduction in maximum scour depth with inclined bridge piers in comparison with vertical bridge piers. The least scour depth was observed around 10° inclination for rectangular and circular shaped sections and 5° for diamond bridge pier. On average 53.25%, 57.25%, and 72% reduction in scour depth was observed for inclined rectangular, diamond, and circular bridge piers respectively as compared to the vertical bridge piers. The circular bridge pier proved the most effective inclined pier, exhibiting the least scour depth among the three pier shapes. Furthermore, no equation was found in the literature to predict the maximum scour depth around inclined bridge piers on clay-sand mixed beds, so three non-linear regression-based equations for three different upstream collinear piers as a function of clay content percentage and inclination were predicted which reasonably described the experimental data.

Abstract Image

清水条件下粘土-砂混合粘性沉积床倾斜桥墩周围局部冲刷的实验研究
文献中发现了一些关于粘土-砂混合(粘性沉积物)河床上垂直桥墩周围清水局部冲刷的研究。然而,还没有关于粘土-砂混合粘性河床倾斜桥墩周围局部冲刷的研究报告。这项研究工作的目的是调查双斜桥墩(会聚-垂直桥墩)对在含有 20-80% 不同粘土含量(含沙量)的四个河床上沿水流方向安装的最大冲刷深度的影响。每种情况下都测试了三种不同截面形状的桥墩(圆形、矩形和菱形)。还分析和讨论了在相同河床上与垂直方向的倾角(0°、5°、10°、15°、20°)的影响。结果表明,与垂直桥墩相比,倾斜桥墩的最大冲刷深度大大减小。矩形和圆形桥墩在 10° 倾角附近的冲刷深度最小,菱形桥墩在 5° 倾角附近的冲刷深度最小。与垂直桥墩相比,倾斜的矩形、菱形和圆形桥墩的冲刷深度平均分别减少了 53.25%、57.25% 和 72%。圆形桥墩被证明是最有效的倾斜桥墩,在三种桥墩形状中冲刷深度最小。此外,在文献中没有发现任何方程可以预测粘土-砂混合河床上倾斜桥墩周围的最大冲刷深度,因此针对三个不同的上游对向桥墩,预测了三个与粘土含量百分比和倾斜度相关的非线性回归方程,这些方程合理地描述了实验数据。
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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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