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

然而，充砂土工布袋(土工袋)是一种相对较新的防侵蚀系统。 与传统的硬装甲系统相比具有优势，这归功于其灵活和易渗透的性质。Geobag 河岸保护结构已经成功实施了大约15年，主要是在亚洲，但 在不同的水袋和袋-袋界面下，单元的稳定性仍然存在不确定性 条件。主要原因是现有的设计公式是针对坚硬材料而制定的，没有考虑到 土工栅栏的灵活性。艾伯塔大学与 西北水利咨询公司(NHC)是为了识别影响土工桩稳定性的关键因素，加强我们的 了解土工布护岸系统的性能，并制定可靠的设计方案 计算土工格栅大小的公式。拟议的研究项目将包括一个大型系统实验室。 实验与计算建模相结合。所受水压力之间的关系 考虑到土工袋的灵活性，将建立袋表面和袋的稳定性。 这些发现将被用来制定尺寸配方，并将被纳入指南。改进后的 这些知识将为土工坝河岸设计标准的制定提供指导和促进。 保护结构。结合过滤特性和稳定性，土工桩是临时工程的理想选择，可以 从河流系统中移除，以及后来纳入永久水系的准备工作 行得通。该研究将有利于土工格栅的广泛应用，大大降低土工格栅的成本 材料、建筑、洪水破坏和随后的修复工作，以及促进可持续侵蚀 控制了整个加拿大。

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.