An experimental investigation for the determination of the optimum ratio of nano clay for reducing local scour around a cylindrical bridge pier

Water Supply Pub Date : 2024-07-19 DOI:10.2166/ws.2024.164
Abubaker Sami Dheyab, Mustafa Günal
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Abstract

Local scour is one of the main causes of the bridge collapse. It occurs when the flow erodes the sediments surrounding the bridge's piers. This experimental study aims to find an innovative approach for armoring the bed using nano clay to mitigate the erodibility of non-uniform sand beds. Additionally, the study investigates the nano clay-sand bed under various hydraulic conditions, with different pier diameters to determine the optimal nano clay ratio for minimizing local scour around a cylindrical bridge pier. This study indicates that the nano clay could be used effectively to reduce the local scour depth, with an optimum ratio of 0.25% when the flow shallowness is less than 1.4 and an optimum ratio of 0.5% for the flow shallowness between 1.4 and 2. Notably, a significant reduction of up to 68% in local scour depth is observed out of all experiments. Furthermore, the study demonstrates the influence of nano clay on other factors related to local scour depth. It presents a predictive equation that can be used to estimate the depth of local scour in a bed composed of nano clay and non-uniform sand. This equation is derived from the obtained data from this experimental investigation.
确定纳米粘土最佳比例以减少圆柱形桥墩周围局部冲刷的实验研究
局部冲刷是造成桥梁垮塌的主要原因之一。当水流侵蚀桥墩周围的沉积物时,就会出现这种情况。本实验研究旨在寻找一种创新方法,利用纳米粘土加固沙床,以减轻非均匀沙床的侵蚀性。此外,该研究还调查了不同水力条件下的纳米粘土-沙床以及不同直径的桥墩,以确定最佳的纳米粘土比率,从而最大限度地减少圆柱形桥墩周围的局部冲刷。研究表明,纳米粘土可有效减少局部冲刷深度,当水流浅度小于 1.4 时,最佳比例为 0.25%;当水流浅度介于 1.4 和 2 之间时,最佳比例为 0.5%。值得注意的是,在所有实验中都观察到局部冲刷深度大幅降低了 68%。此外,该研究还证明了纳米粘土对与局部冲刷深度有关的其他因素的影响。研究提出了一个预测方程,可用于估算由纳米粘土和非均匀砂组成的河床的局部冲刷深度。该方程是根据实验研究获得的数据推导出来的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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