SEISMIC PERFORMANCE EVALUATION OF GROUND IMPROVEMENT USING RIGID INCLUSIONS AT GARONGKONG SEA PORT

• Main Author: Razan Ediansjah, Faikar
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/77903
• Institution: Institut Teknologi Bandung

iv ABSTRACT SEISMIC PERFORMANCE EVALUATION OF GROUND IMPROVEMENT USING RIGID INCLUSIONS AT GARONGKONG SEA PORT By Faikar Razan Ediansjah NIM: 25022117 (Program Studi Magister Teknik Sipil) Earthquakes are natural disasters that happen quite frequently in Indonesia. These earthquakes can cause liquefaction which cause immense amounts of damage, as seen in the Palu 2018 earthquake. Liquefaction happens due to the soil’s increase of excess pore water pressure during an earthquake. Once the pore water pressure ratio (?? ?0?) reaches 1, the soil loses its effective stress and starts behaving like a fluid. Liquefaction can be mitigated by reducing the increase of excess pore water pressure. One way of achieving this is by installing rigid inclusions to limit the soil’s deformation, which will reduce the excess pore water pressure increase. This study aims to evaluate the performance of rigid inclusions to improve the soil of the Garongkong Sea Port embankment affected by the Palu 2018 earthquake. The performance will be evaluated based on the reduction of displacement, reduction of pore water pressure ratio, and comparison of the response spectra before and after rigid inclusion installation. The study is done numerically by modelling the case as a plane strain non linear time history using the MIDAS GTS NX software. The Palu 2018 earthquake is treated as ground motion which is propagated from the bedrock to the bedrock with the help of DEEPSOIL. Analysis results show that installing rigid inclusions with specifications frequently used in construction can reduce displacements by 86 %, reduce pore water pressure ratio by 49 %, and reduce spectral accelerations at periods below 0,5 seconds while increasing them at higher periods.