標題: Investigating effect of water level variation and surface tension crack on riverbank stability
作者: Chen, Chien-Hua
Hsieh, Te-Yung
Yang, Jinn-Chuang
土木工程學系
防災與水環境研究中心
Department of Civil Engineering
Disaster Prevention and Water Environment Research Center
關鍵字: Riverbank stability model;Flume experiment;Tension crack;River and groundwater level interaction
公開日期: 1-Jun-2017
摘要: During high flow season, the rise and fall of river water level could induce riverbank instability and threaten structural safety of flood-protection facilities on floodplains. Through a flume experiment, this paper investigates the influences of three factors (namely, drawdown rate of river stage, initial water elevation, and riverbank slope angle) on riverbank stability due to the fall of river water level. From the laboratory experiments it was observed that tension crack appeared in all riverbank failure cases and all failure patterns were of planar type. Moreover, this paper presents a riverbank stability analysis model that explicitly incorporates the integral effect of all forces acting upon the failure plane and tension crack. The prediction accuracy of the proposed model is examined by using experimental data obtained in this study and field data of the Hotophia Creek in the USA and the Sieve River in Italy. A comparison of model simulation results with and without considering tension crack clearly indicates the importance and necessity of including tension crack for achieving good accuracy in riverbank stability simulations. For practical application of the improved riverbank stability model, two empirical formulas for estimating tension crack location and failure plane angle were examined and modified to enhance their appropriateness in riverbank stability simulation. Finally, the improved model with the modified empirical formulas was verified to show its good prediction in riverbank stability analysis. (C) 2017 International Association for Hydro-environment Engineering and Research, Asia Pacific Division. Published by Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jher.2017.02.002
http://hdl.handle.net/11536/145543
ISSN: 1570-6443
DOI: 10.1016/j.jher.2017.02.002
期刊: JOURNAL OF HYDRO-ENVIRONMENT RESEARCH
Volume: 15
起始頁: 41
結束頁: 53
Appears in Collections:Articles