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Urban Deep Excavation & Basal Heave Control
High risk Tunnels & infrastructure 2024

Urban Deep Excavation & Basal Heave Control

Deep basement excavation with strutless support and heave-sensitive foundation design.

Overview

Geotechnical design for a 28 m urban excavation adjacent to heritage structures, including wall deflection limits, basal heave screening, and dewatering impact assessment.

Numerical models were calibrated against inclinometer data during early excavation stages.

Photos & video

Excavation sequence model
Inclinometer calibration plot

Challenges

  • Sensitive adjacent foundations
  • High basal heave potential
  • Variable glacial soils

Outcomes & solutions

  • Calibrated FEM wall deflection model
  • Revised strut schedule reducing movement
  • Heritage structure protection plan
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