Stability of Geobags in Riverbank Erosion Protection Structures - Experimental and Numerical Study

然而，填砂土工织物袋（土工袋）是一种相对较新的侵蚀防护系统， 与传统的硬装甲系统相比，其优点在于其灵活和多孔的性质。土工袋 河岸保护结构已经成功实施了大约15年，主要是在亚洲， 在不同的水囊和囊袋界面下，单元的稳定性仍然存在不确定性 条件其主要原因是现有的设计公式是针对硬材料的，没有考虑 地质袋的灵活性。阿尔伯塔大学与 西北水利顾问公司（NHC）将确定影响土工袋稳定性的关键因素， 了解土工袋护岸系统的性能，并制定可靠的设计方案 用于确定土工袋尺寸的公式。拟议的研究项目将包括一个大型系统实验室 实验结合计算机建模。施加的液压力之间的关系 考虑到土工袋的柔性，将建立袋的稳定性。 研究结果将用于制定一个上浆公式，并将纳入指导方针。改进的 知识将提供指导，并促进土工袋河岸设计标准的制定 保护结构。结合过滤性能和稳定性，土工袋是临时工程的理想选择， 从河流系统中移除，以及后来纳入永久性的准备工作 工程.这项研究将有助于更广泛地应用土工袋，这将大大降低相关的成本， 材料，建筑，洪水破坏和随后的恢复工作，以及促进可持续的侵蚀 控制整个加拿大。

Sand-filled geotextile bags (geobags) are a comparatively new erosion protection system, however advantageous over traditional hard armour system, credited to their flexible and porous nature. Geobag riverbank protection structures have been implemented with success for about 15 years mostly in Asia, but there are remaining uncertainties about the element stability under various water-bag and bag-bag interface conditions. The main reason is that existing design formulae are made for hard material and do not consider the flexible nature of the geobags. The goals of the partnership between the University of Alberta and the Northwest Hydraulic Consultants (NHC) are to identify the key factors affecting geobag stability, enhance our understanding of the performance of geobag riverbank protection system, and develop a reliable design formula for sizing the geobags. The proposed research project will include a large-scale systematic laboratory experiments in conjunction with computational modeling. The relationships between hydraulic forces exerted on the bag surface and bag stability will be established, taking into consideration the flexibility of the geobags. The findings will be used to develop a sizing formulae and will be incorporated into guidelines. The improved knowledge will provide guidance and facilitate the development of a design standard for geobag riverbank protection structures. Combining filter properties with stability, geobags are ideal for temporary works that can be removed from the river system, as well as preparatory works that is incorporated later into the permanent works. This research will facilitate wider application of geobags which will greatly reduce the cost related to material, construction, flood damage and subsequent restoration work, as well as promote a sustainable erosion control across Canada.