Analysis of Soil Retaining Wall from Geosynthetic for Sea Reclamation to Become a New Land in the Beach

Abstract

: Reclamation is a business to get land that was covered by water into dry land and to be used as useful land in accordance with its purpose. This reclamation can be carried out on lands that are on the coast, swamps, and offshore. In this study, land reclamation is intended as a port development area so that land requirements are in accordance with the port development plan on the coast. The location of this research is in the southern area of Ketapang Regency, West Kalimantan, which is 18 km from the Ketapang City Center. This regency does not yet have a coastal port, all of its ports are in the river, which certainly often occurs siltation due to sedimentation. Land reclamation is carried out to pursue the depth of the waters in accordance with the berthing of ships to be anchored so that no trestle construction is needed but by reclaiming it, it can save the cost of building the structure. The research method used in this study, by analyzing wind data as a reference for wave generation and calculating the wave deformation that occurs, bathymetry data as a reference for water depth, tidal data is intended as one in the design of the retaining wall height, estimated loading above the reclamation structure land, and the external forces that occur on the retaining wall. The design of the retaining wall uses geobags in a stacked manner, has a total height of 6.3 m buildups from sea level to the deepest seabed and forms a trapezoidal structure with a trapezoid peak width of 5.09 m (3 geobag lines) and a trapezoid base width 26.47 m (11 lines/stack). The size of Geobag 2 x 1.5 x 0.6 m. Geobag size is obtained from the calculation of the effect of waves on the geobag structure. So that the weight is determined by the required volume size and then the size is further reviewed by the effect of soil pressure due to the embankment for reclamation held by the geobag structure by analysis of overturning, sliding, and bearing capacity permitted exceeded.