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  Design Approach of Circular Shaft Founded Partially on Limestone

  Circular shafts are very efficient earth retaining system for deep excavation owing to transfer of ground stresses via hoop stress instead of beam action. However, in actual construction where the retaining walls are constructed in discrete panels, construction tolerances in addition to risk of uplift or basal heave failures are important factors to consider during design stage. This paper presents the design approach adopted for a ring beam free circular escape shaft in the Klang Valley Mass Rapid Transit Line 2 in Malaysia, where it is seated partially in karstic limestone features overlain with relatively weak soil and high groundwater table. Scenarios of potential problems will be discussed along with the proposed solutions in addressing these challenges.

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