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  Design and Construction of an Intervention Shaft of MRT Orange Line Project

  Currently, the Orange Line East Project of Mass Rapid Transit Authority of Thailand (MRTA) is being constructed. The main structures of this project consist of cut and cover tunnels, intervention shafts, stations and bored tunnels. For the intervention shafts (IVS), the depth of excavation is approximately 25 to 40 m from ground surface using top-down construction. The IVS has 4 to 5 permanent slabs and a temporary bracing layer above base slab level. Determination of bracing loads was mainly made through 2D FEM analysis. However, due to deep-boxed shaped of the intervention shaft, the consideration of the corner effect was incorporated in the interpretation of the 2D FEA result for the design calculation. Verification during the construction of the design approach is made by means of instrumentation consisting of inclinometers to monitor wall deflection and strain gauges for loads on the bracing.

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