Seismic design response spectrum and soil liquefaction assessment for Tanjung Kidurong Power Plant, Bintulu, Sarawak

Nayli Batrisyia, Nordin (2019) Seismic design response spectrum and soil liquefaction assessment for Tanjung Kidurong Power Plant, Bintulu, Sarawak. [Final Year Project Report] (Unpublished)

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Abstract

Seismic conditions have been taken into account by engineers in designing structures due to a few evidences of Malaysia being vulnerable to seismic activities. The design has become a necessity in designing a building approaching the end of 2017 as the Malaysia National Annex to Eurocode 8 (MS EN 1998-1: 2015) has been established. In ensuring the constant operability of power plants during earthquakes, it is recommended to improve the current design of power station in Malaysia as seismic design consideration for power station is vital. The aim of the study is for computing the seismic design response spectrum and soil liquefaction assessment while the key objective is to investigate the settlements due to liquefaction. The present study describes the seismic ground response analysis and assessment to soil liquefaction. The procedures in carrying out the ground response analysis includes: (1) obtaining ground motion data; (2) analysing soil dynamic properties; (3) carrying out analysis in one dimensional shear wave propagation; and (4) computing the site-specific design response spectra. In the other hand, analysis for the soil liquefaction involves : (1) retrieve soil data; (2) assess soil liquefaction potential; and (3) calculate soil settlements. It is found that the site-specific response spectrum have a maximum spectral acceleration of a higher value for Far-Field Earthquakes than for near-field earthquakes which shows that the longer distance of a rupture surface to the site and the type of underlying soil plays a great role in amplifying the ground motion. The maximum seismic soil amplification ratio for Tanjung Kidurong Power Plant, Bintulu Sarawak are between 2.21 and 3.7. The soil factors for type C are different from Sarawak National Annex (MS EN 1998-1: 2015) which could be due to the limitation of National Annex taking the average of some soil investigation data. Based on this research, all the boreholes are at risk for liquefaction to occur. The highest settlement occurs at the borehole which contains more silt and clay than the other boreholes.

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