Seabed Strengthening in the Arctic by Deep Mixing

by Donald W. Quigley, Harding Lawson Associates, Tustin, CA, USA,
Gerald M. Diaz, Harding Lawson Associates, Tustin, CA, USA,
Sherman B. Wetmore, Harding Lawson Associates, Tustin, CA, USA,

Document Type: Proceeding Paper

Part of: Civil Engineering in the Arctic Offshore


Improvement of soft soil sites in the Beaufort Sea would increase the versatility and usefulness of bottom-founded gravity structures for both mobile drilling units and permanent production facilities. Background information and the technical feasibility of strengthening seabed soils in the Arctic by in-place mixing with portland cement slurry (Deep Mixing) are presented. Literature review, discussions with knowledgeable consultants in the field of soil improvement, two preliminary environmental assessments, and meetings with Japanese engineers and contractors specializing in the Deep Mixing method of seabed strengthening are utilized. A laboratory testing program with Beaufort Sea soils and simulating Arctic conditions, is now underway to confirm the apparent suitability of this soil-stabilization technique.

Subject Headings: Soil mixing | Soil strength | Sea floor | Soil cement | Structural strength | Soil properties | Soil stabilization | Materials processing | Arctic | Beaufort Sea

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