Wave-induced pressures and internal stability of geotextile sand containers in artificial reefs

Saenger, Greg (2001). Wave-induced pressures and internal stability of geotextile sand containers in artificial reefs B.Sc Thesis, School of Engineering, The University of Queensland.

       
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Author Saenger, Greg
Thesis Title Wave-induced pressures and internal stability of geotextile sand containers in artificial reefs
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2001
Thesis type B.Sc Thesis
Supervisor Peter Nielsen
Total pages 54
Language eng
Subjects 09 Engineering
Formatted abstract

Artificial reefs constructed of large geotextile sand containers are becoming a more common method of controlling and managing coastlines around the world. As a relatively new approach, many facets of their behaviour, including their response to wave-induced pressures, have not been fully investigated. While many failure modes have been identified, few have actually been extensively studied and many designs are based on principles derived from rubble-mound breakwaters – structures that, while they serve the same purpose, do not necessarily function in the same manner.  

There are three recognised failure modes – horizontal translation, rotation and internal sand migration. This thesis aims to investigate possible mechanisms for failure by internal sand migration and to develop a better understanding of how geocontainers respond in a dynamic wave environment. This was achieved by obtaining pressure data from a prototype geocontainer placed on the Narrowneck Artificial Reef on the Gold Coast.  

The major conclusions drawn from these theses are: (1) Attenuation of pressure waves within the bag itself is unhindered by the geotextile membrane and is consistent with current theoretical models for wave-induced pressures in a horizontal seabed. (2) There was an insignificant lag of the transmitted pressure wave. (3) Due to the structure’s response to wave-induced pressures, models which assume that the structure is solid with respect to pressures should be used with caution (4) Liquefaction, combined with horizontal differential pressures, provide a mechanism for internal sand migration. (5) To control this internal sand migration, appropriate bag filling and container shape is essential.

Keyword Wave-induced pressures
Geotextile sand containers
Internal stability
Additional Notes * Civil Engineering undergraduate theses. 2001

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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