Abstract
The breakwater construction usually founded in coastal area with many public or company facilities. It is very useful to break the ocean waves so it can not reach the shore line. Furthermore, the breakwater construction is also applied as a barier for a port for ship docked. One of the type of breakwaters is tube column filled with compacted sand reinforced by sheet file and tie beam. This research will discuss about the sheet pile displacement in static and dynamic condition. Plaxis is applied as the main tool to built the 2-D model based on given data from field observation. The input parameter for this model is applied in soil stratigraphy, compacted sand column, sheet pile, tie beam, pseudostatic wave force, sea level and earthquake acceleration. The running of this model divided in three condition. There are static condition, static condition with pseudostatic wave force, and dynamic condition. The results show different displacement between the conditions. The sheet pile displacement in static condition is 3.35 cm at harbor side and 1.91 cm at open sea. The sheet pile displacement in static condition with pseudostatic wave force is 12.14 cm at harbor side and 12.08 cm at open sea. The sheet pile displacement in dynamic condition has 5 cm peak both harbor side and open sea.
Highlights
Breakwater construction is one of the water structures that aim to break the waves coming from the sea to the shoreline
The main purpose of developing a breakwater in harbor is to protect the area of anchor ponds or harbor area by reducing the height of sea waves, so the ships can dock safely to carry out loading and unloading
The sheet pile displacement at the open seaside is 1.91 cm and the harborside is 3.35 cm. This is influenced by the differences in seabed elevation in which the open seaside is higher than the harborside
Summary
Breakwater construction is one of the water structures that aim to break the waves coming from the sea to the shoreline. There are Young’s modulus (E), poisson’s ratio (v), cohesion (c), friction angle (j), and dilatancy angle (y). Bowles (1977) proposed the poisson’s ratio value according to the soil types. High friction angles value usually obtained from dense sands. Bowles (1984) proposed the friction angle ranged value based on N-SPT value for sandy and clayey soil. For some types of rock, Goodman (2010) proposed the cohesion and friction angle value. The E value obtained from Eq (6) where f’c is the concrete compressive strength In this case, the tie beam in Plaxis is considered as an anchor because they have the same force behavior. There are fewer parameter input than plate model that is only EA and Lspacing where each value represents the individual anchor
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