Analysis of culverts during extreme flood events

Stainwall, Haren (2016) Analysis of culverts during extreme flood events. [USQ Project]

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Abstract

This research examines the scour potential and hydro-dynamic forces acting on a reinforced concrete box culvert to evaluate the adequacy of current culvert design practices. The research motivation is mainly due to the major culvert and floodway failures recorded during the 2011 and 2013 Queensland flood events in the Lockyer Valley region. Repeated failures of culverts and floodways during these two successive events indicated that there are some potential drawbacks in the current culvert design practices. Current culvert design procedure is centred around the hydraulic and hydrological aspects of the culverts which primarily encompasses the head water and tail water conditions of a culvert. The current guidelines do not provide adequate information to estimate the scour potential around culverts and associated hydro-dynamic forces such as drag and lift forces. Further, scour potential and drag and lift forces are not comprehensively studied with respect to changes in geometry and flood conditions. This research therefore comprehensively studies relationships between these parameters using a simulated reinforced concrete box culvert in ANSYS fluent software package.

The analysis of this research is based on a reinforced concrete box culvert in the Left Hand Branch Road (LHBR) in the Lockyer Valley Regional Council area. The case study area is selected mainly based on the current USQ research funded by the Bushfire and Natural Hazard Cooperative Research Centre and to align with USQ research directions and interest. Key design parameters such as flood intensities are not available for this region mainly due to the regional nature of the selected case study area. Therefore, a parametric study is conducted to simulate different flood intensities in conjunction with field visits and available drawings. Results indicate that the AS 5100.2-2004 underestimates the drag and lift forces acting on the culvert. Also, results indicate that the AS5100.2-2004 fails to account for variation of drag and lift forces due to changes in geometry such as culvert length. This research further analyses the scour potential at different Analysis of Culvert during Extreme Flood event flood intensities and attempts to establish maximum scour depth. Findings as well as the overall methodology developed in this research provide a clear research direction to researchers who are examining these issues. This will eventually lead to enhance performances of culverts and hence increased community resilience.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) Major Civil Engineering project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Wahalathantri, Buddhi; Karunasena, Karu; Lokuge, Weena
Date Deposited: 23 Jul 2017 23:49
Last Modified: 23 Jul 2017 23:49
Uncontrolled Keywords: hydro-dynamic forces; reinforced concrete box culvert; hydraulic; floodways; hydrological
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090502 Construction Engineering
URI: http://eprints.usq.edu.au/id/eprint/31485

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