The DPLEX (Eccentric Parallel Linking Multiple-shaft) slurry and earth-pressure shield method was used for the shield tunnel between Kinshicho and Oshiage Stations of Eidan Subway Line Hanzomon. Measurement of ground deformation was made for the initial drive section because this is the first slurry and earth-pressure shield method ever employed by TRTA. Excavation was made in soft clayey ground, and this is the largest diameter tunnel ever excavated using this type of shield method. Excavation

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... control values were determined on the basis of measurement results. The amount of instantaneous settling and subsequent settlement due to consolidation of the tail void were calculated using the FEM analysis method used by TRTA. The results showed satisfactory agreement with the measured values, proving that this analysis method is applicable for the slurry and earth-pressure method.