Research Article

Shield Tunneling under Railway Station Throats in Soft Soil Areas: A Case Study

Table 3

Comparison of line alignments.

ItemScheme 1Scheme 2 (selected)Scheme 3

Minimum curve radius (m)450350300
Line shape beneath railway throatCurvature, R = 450 mStraight linePartly straight; partly curvature R = 300 m
Tunneling difficultyAverageGoodPoor
Turnouts right above the tunnels633
Double-slip turnouts affected211
Spatial relationshipReference9–11 m to the west12–15 m to the west
Metro operation conditionGoodAveragePoor