RECLAMATION DESIGN IN SEMARANG WATERS WITH VERTICAL DRAIN SOIL IMPROVEMENT METHOD

• Main Author: Rahmaniar Wanaputri, Safira
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55696
• Institution: Institut Teknologi Bandung

Indonesia as an archipelago country has a very important coastal area for the survival of its people. The coastal area has long been used by the its people as a central residential area, industry, tourism, and so on. Because of this, there is an increase in the need for land to accommodate various activities in coastal areas. As a solution, reclamation work was carried out to provide new lands. The implementation of reclamation must be carried out by taking into account various aspects, such as geothecnical conditions of the soil and environmental conditions in the reclamation area, stability of the embankment above the ground, and land subsidence due to embankment loads. In this study, the stability of the embankment will be analyzed using the finite element method with modeling on the PLAXIS 2D software. In addition, a soil improvement plan will be carried out using a vertical drain which is useful for accelerating the process of land subsidence so that there is no damage to the structure above ground using the VDrainSt program in excel. The reclamation plan will be carried out in the waters of Semarang, Central Java, Indonesia. Based on the analysis and calculation results, the reclamation embankment is planned to have an elevation of +6.1 m from the LWS, but due to the consolidation process, the thickness of the filled soil must reach 8.3 m in order to reach the planned elevation. In the stability analysis, the value of the safety factor is 1.74 when given the operational load. Soil improvement was carried out using vertical drains with triangular pattern and 1 m distance between each vertical drain, is able to accelerate soil improvement at a degree of consolidation of 90% from 17000 days (47 years) to only 29 days.