Abstract
The shield tunneling has been extensively implemented for construction of undergroundtransportation systems in urban areas. Reports on tunnel segment damage during tunnel construction becomeincreasing. The jack thrust force is the essential cause of damage to the segment. The objective of this articleis to present the model which analyzes the behavior of tunnel lining during construction. The model consistsof five rings and ten segments for each ring connected together with the shear springs which represent thesegment joints and ring joints. The zero thickness interface elements are used to model the segment interfacebehavior and soil stiffness is represented by mean of ground springs. All relevant construction loads are takeninto account in the analysis. The ground spring model is implemented into FEM program ABAQUS to analyzethe behavior of segmental lining during construction along straight and curve alignments. The analysis resultsagree with the measurement data and confirm that the stresses of tunnel segments are governed by jack thrustforce. The ground-spring model has been proven to be appropriate for analysis of behavior of the tunnelsegments.
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