Liquefaction Susceptibilty Analysis for An Offshore Site Based on Geotechnical Field Test Data

Abstract eng:
Liquefaction is one of the most devastating effects of earthquakes resulting in a sudden decrease in shear strength due to excess pore water pressure generation. This will result in the differential settlement of structures and causing severe damages. This paper presents a detailed evaluation of liquefaction susceptibility for an offshore site in Western Yemen based on extensive field tests. The offshore site is the key location where major structures such as single point mooring (SPM) system along with the associated pipeline end manifold are located. The presence of loose marine sediments and submerged condition, favours liquefaction during an earthquake event, which can affect the lateral load carrying capacity of pile foundation. This signifies the need for a liquefaction susceptibility analysis of in-situ soils, before the estimation of load carrying capacity of piles in the marine soil strata. In this paper, the liquefaction susceptibility of the marine soil sediments was evaluated based on extensive field and laboratory tests. The liquefaction susceptibility was predicted based on grain size distribution, liquid limit data along with cone penetration test data. Potentially liquefiable soil layers in offshore site are identified based on the results of these test data.

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