BTSYM | MADRID TRADITIONAL METHOD


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Above, figure 4: Typical MTM cross section for Madrid metro PHOTO CREDIT: AUTHORS


Finally, MTM allows the creation of the Madrid


metro typical cross section as shown in Figure 4, which has an internal section of approximately 8m wide by 6m high (26.2ft by 19.7ft). This is a double-track tunnel with emergency and maintenance walkways on each side and an internal area of 45m2


“(53yd2 ).


Typical MTM cross-section for Madrid metro The typical cross-section uses a cast in-place unreinforced concrete lining with a design excavation volume of 72 m3


/lm and concrete liner of 28 m3 /lm.


The concrete liner thickness ranges from 0.6m to 1.4m (2ft to 4.6ft) and relies on the mobilization of the hoop force through the section. They key for designing an unreinforced concrete liner is that there is little eccentricity between the mobilized thrust region and the centroid line of the section.


MODELLING THE MTM (3D SSI) To design the MTM for Line 5, we decided to model the complete sequence in PLAXIS 3D for the Soil-Structure Interaction (SSI) model.


Phase 2


Phase 3


Phase 42


Phase 60


Phase 98


Phase 115 Above, figure 5: Examples of construction phases set out in the MTM 3D SSI model PHOTO CREDIT: AUTHORS 44 | Summer 2023


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