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Bioengineering approach for shoreline protection using geosynthetics: A Malaysian experience

This paper describes the use of bioengineering approach for the design and construction of shoreline erosion protection at an oil and gas jetty in Sarawak, Malaysia. Bioengineering approach was chosen by the client over conventional armour rocks as it is the most economical solution, minimal dis-turbance to existing loading and unloading activities and safety as the jetty handle flammable cargos and does not permit use of heavy equipment. The reclamation works can be divided into two stages. The first stage involved construction of a geotextile tube containment dyke platform above the mean sea level which was created by placement of a 1.8m inflated height geotextile tube infilled with sand subjected to a maximum tidal variation of 6.0m. This tube is made of coarse grain geotextile sheet and is installed over a thick layer of soft underlying soil. Stage two involved sand reclamation beside and above the geotextile tube dyke to a maximum height of 4m at a slope inclination of 1V: 2H. To maintain the slope inclination of the sand filling slope from wave erosion, a layer of coarse grain sand filled mattress inflated to an in-flated height of 0.18m, and geotextile bags was installed over the sand- filled slope. To prevent global sliding and lateral movement of the structure during construction, a layer of high strength geotextile basal reinforcement was installed on the soft underlying soil prior to the geotextile dyke placement and sand filling. An important highlight of this paper is the installation of the geotextile dyke in a limited head-room space as the tube alignment need to pass through between piers under the existing bridge deck. A total quantity of 340m length of geotextile tube dyke, 6000m2 of sand filled mattress, 500 pcs of geotex-tile bags and 5000m2 of high strength geotextile was successfully installed.