Jet Grouting for Deep Excavation Support at Re-entrant CornersÂ-Video

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The paper reviews jet grouting used to seal gaps between retaining walls at re-entrant corners of New York’s 96th Street Station. At Entrance 3, contractors used two passes with fixed parameters; at Ancillary 2, constraints required a single pass with parameters varied by soil type, and some columns used single-fluid jetting after ground movement. Both approaches produced target column sizes with reasonable continuity, strong cores, and effective water tightness and excavation support. Fixed parameters gave more consistently favorable spoil-gravity ratios (SGR) and simpler quality control, while soil-specific parameters were more variable and harder to verify.

Keywords

jet grouting

retaining walls

water tightness

soil-specific parameters

quality control