ABSTRACT
Telok Blangah station is one of the underground MRT stations constructed under Circle Line Stage 5. The main geological unit underlying the site is the Jurong Formation with the Henderson Road fault suspected to locate within or near the excavation. The station is located in close proximity to the Telok Blangah Semi-Expressway viaduct structure, and at the closest, the soldier pile retaining wall was just about 2.8m from a viaduct ramp pier. This paper presents an overview of the ground conditions, the key risk mitigation measures implemented to successfully minimise impact to the viaduct and the performance of the earth retaining systems against design predictions. It was found that design predictions were in close agreement with the measured CBP wall movements, whereas there were significant differences in the performance of the soldier pile wall compared with design predictions which could be a result of the way design analysis for this type of retaining wall is commonly carried out.
Keywords: Soldier pile wall, Contiguous bored pile wall, Jurong formation, Henderson fault.
