Ground Stabilization using Deep Soil Mixing Technique for an Approach Ramp-Video

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Video Summary

Vijay, a technical manager with Bower UAE, presented a deep soil mixing (DSM) project for an approach ramp on the proposed 11-kilometre Wednesbury–Brierley Hill Metro extension in the UK. The ramp and central concrete box structures needed to rise about six metres over weak, variable railway embankment fill, with strict settlement limits.<br /><br />The design used 2-metre-diameter DSM columns beneath the structures, combined with a 0.5-metre geogrid-reinforced load transfer platform. Columns were sized and spaced to meet load-specific area replacement ratios and limit settlement to 20 mm. The grout used 206 kg/m³ of a 30% Portland cement and 70% GGBS blend, with a water-cement ratio of 2.4.<br /><br />A trial zone load test produced 16 mm settlement under 250 kPa. Ninety-day core and wet samples exceeded the 0.75 MPa UCS target. The method was completed ahead of schedule and offered lower cost, emissions, noise, vibration, and material use than piling. Long-term drained soil properties were not assessed.

Keywords

deep soil mixing

Wednesbury–Brierley Hill Metro extension

settlement control

geogrid-reinforced load transfer platform

Portland cement GGBS grout

trial zone load test