Effects of bag characteristics and channel side slope on incipient motion of a single Geobag under river current loading

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-05-17 DOI:10.1016/j.geotexmem.2024.05.001

Kendra White , Yuntong She , Knut Oberhagemann , Angela Thompson , Wenming Zhang

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Abstract

Geobag stability has not been extensively studied under river current loading. In this study, the impacts of geobag characteristics (shape, bag material, and fill ratio of sand) and channel side slope (flat and 1V:2H) on a single geobag's stability were systematically investigated in a physical model to form the solid foundation for the research of group geobags. Overall, a geobag with a higher fill ratio, combined with the more flexible cloth material, was found to be the most stable. Critical Shields parameters were estimated between 0.0018 and 0.019, and the cross-sectional averaged flow velocity at incipient motion ranged from 0.49 m/s to 1.08 m/s. A shape factor was introduced to better describe the relationship between geobag characteristics and their stability on both riverbed configurations. Both the fill ratio and the bed side slope had higher importance on the geobag's stability compared to the relative depth, bag shape, and angle of flexibility.

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袋特性和河道边坡对单个土工袋在河流加载下的初始运动的影响

目前尚未对土工袋在河水荷载作用下的稳定性进行广泛研究。本研究在物理模型中系统地研究了土工袋的特性（形状、袋材料和砂的填充率）和河道边坡（平坡和 1V：2H）对单个土工袋稳定性的影响，为研究群体土工袋奠定了坚实的基础。总体而言，填充率较高的土工袋与弹性较好的布材料相结合，稳定性最好。据估计，临界希尔兹参数介于 0.0018 和 0.019 之间，初动时的横截面平均流速介于 0.49 米/秒和 1.08 米/秒之间。为了更好地描述土工袋特性与其在两种河床结构上的稳定性之间的关系，引入了形状系数。与相对深度、土工袋形状和柔性角相比，填充率和河床边坡对土工袋稳定性的影响更大。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.